chore(release): 4.8.0 [skip ci]

# [4.8.0](https://github.com/mob-sakai/ParticleEffectForUGUI/compare/v4.7.2...v4.8.0) (2024-06-27)

### Bug Fixes

* generated baking-camera object remains in the prefab or scene (again) ([de35cba](de35cba34c))
* SetParticleSystemInstance/Prefab APIs destroy generated objects ([ae3f3a8](ae3f3a8e62))

### Features

* add 'custom view' option. ([a703c29](a703c2921c))
* remove overlay window (editor) ([8358170](835817049f))
* restore `Transform.localScale` when setting `autoScalingMode` to something other than `Transform` (again) ([88a970d](88a970d93a))
* the rendering order list in inspector is now more compact ([be90172](be901724e0))

.github/FUNDING.yml

@@ -0,0 +1,12 @@
+# These are supported funding model platforms
+
+github: mob-sakai # Replace with up to 4 GitHub Sponsors-enabled usernames e.g., [user1, user2]
+patreon: mob_sakai # Replace with a single Patreon username
+open_collective: # Replace with a single Open Collective username
+ko_fi: # Replace with a single Ko-fi username
+tidelift: # Replace with a single Tidelift platform-name/package-name e.g., npm/babel
+community_bridge: # Replace with a single Community Bridge project-name e.g., cloud-foundry
+liberapay: # Replace with a single Liberapay username
+issuehunt: # Replace with a single IssueHunt username
+otechie: # Replace with a single Otechie username
+custom: # Replace with up to 4 custom sponsorship URLs e.g., ['link1', 'link2']

.github/ISSUE_TEMPLATE/bug_report.md

@@ -0,0 +1,35 @@
+---
+name: Bug report
+about: Create a report to help us improve
+title: ''
+labels: bug
+assignees: mob-sakai
+
+---
+
+NOTE: Your issue may already be reported! Please search on the [issue tracker](../) before creating one.
+
+**Describe the bug**
+A clear and concise description of what the bug is.
+
+**To Reproduce**
+Steps to reproduce the behavior:
+1. Go to '...'
+2. Click on '....'
+3. Scroll down to '....'
+4. See error
+
+**Expected behavior**
+A clear and concise description of what you expected to happen.
+
+**Screenshots**
+If applicable, add screenshots to help explain your problem.
+
+**Environment (please complete the following information):**
+ - Version [e.g. 4.0.0]
+ - Platform: [e.g. Editor(Windows/Mac), Standalone(Windows/Mac), iOS, Android, WebGL]
+ - Unity version: [e.g. 2022.3.0f1]
+ - Build options: [e.g. IL2CPP, .Net 4.x, LWRP]
+
+**Additional context**
+Add any other context about the problem here.

.github/ISSUE_TEMPLATE/feature_request.md

@@ -0,0 +1,22 @@
+---
+name: Feature request
+about: Suggest an idea for this project
+title: ''
+labels: enhancement
+assignees: mob-sakai
+
+---
+
+NOTE: Your issue may already be reported! Please search on the [issue tracker](../) before creating one.
+
+**Is your feature request related to a problem? Please describe.**
+A clear and concise description of what the problem is. Ex. I'm always frustrated when [...]
+
+**Describe the solution you'd like**
+A clear and concise description of what you want to happen.
+
+**Describe alternatives you've considered**
+A clear and concise description of any alternative solutions or features you've considered.
+
+**Additional context**
+Add any other context or screenshots about the feature request here.

.github/ISSUE_TEMPLATE/question.md

@@ -0,0 +1,16 @@
+---
+name: Question
+about: Ask a question about this project
+title: ''
+labels: question
+assignees: mob-sakai
+
+---
+
+NOTE: Your issue may already be reported! Please search on the [issue tracker](../) before creating one.
+
+**Describe what help do you need**
+A description of the question.
+
+**Additional context**
+Add any other context or screenshots about the question here.

.github/pull_request_template.md

@@ -0,0 +1,9 @@
+---
+name: Pull Request
+about: Create a pull request
+title: ''
+assignees: mob-sakai
+
+---
+
+**NOTE: Create a pull request to merge into `develop` branch**

.releaserc.json

@@ -0,0 +1,23 @@
+{
+  "branches": [
+    "release",
+    "release-4.x",
+    {
+      "name": "release-preview",
+      "prerelease": "preview"
+    }
+  ],
+  "plugins": [
+    "@semantic-release/commit-analyzer",
+    "@semantic-release/release-notes-generator",
+    "@semantic-release/changelog",
+    [
+      "@semantic-release/npm",
+      {
+        "npmPublish": false
+      }
+    ],
+    "@semantic-release/git",
+    "@semantic-release/github"
+  ]
+}

CODE_OF_CONDUCT.md

@@ -0,0 +1,84 @@
+# Contributor Covenant Code of Conduct
+
+## Our Pledge
+
+We as members, contributors, and leaders pledge to make participation in our community a harassment-free experience for everyone, regardless of age, body size, visible or invisible disability, ethnicity, sex characteristics, gender identity and expression, level of experience, education, socio-economic status, nationality, personal appearance, race, religion, or sexual identity and orientation.
+
+We pledge to act and interact in ways that contribute to an open, welcoming, diverse, inclusive, and healthy community.
+
+## Our Standards
+
+Examples of behavior that contributes to a positive environment for our community include:
+
+* Demonstrating empathy and kindness toward other people
+* Being respectful of differing opinions, viewpoints, and experiences
+* Giving and gracefully accepting constructive feedback
+* Accepting responsibility and apologizing to those affected by our mistakes, and learning from the experience
+* Focusing on what is best not just for us as individuals, but for the overall community
+
+Examples of unacceptable behavior include:
+
+* The use of sexualized language or imagery, and sexual attention or
+  advances of any kind
+* Trolling, insulting or derogatory comments, and personal or political attacks
+* Public or private harassment
+* Publishing others' private information, such as a physical or email
+  address, without their explicit permission
+* Other conduct which could reasonably be considered inappropriate in a
+  professional setting
+
+## Enforcement Responsibilities
+
+Community leaders are responsible for clarifying and enforcing our standards of acceptable behavior and will take appropriate and fair corrective action in response to any behavior that they deem inappropriate, threatening, offensive, or harmful.
+
+Community leaders have the right and responsibility to remove, edit, or reject comments, commits, code, wiki edits, issues, and other contributions that are not aligned to this Code of Conduct, and will communicate reasons for moderation decisions when appropriate.
+
+## Scope
+
+This Code of Conduct applies within all community spaces, and also applies when an individual is officially representing the community in public spaces. Examples of representing our community include using an official e-mail address, posting via an official social media account, or acting as an appointed representative at an online or offline event.
+
+## Enforcement
+
+Instances of abusive, harassing, or otherwise unacceptable behavior may be reported to the community leaders responsible for enforcement at sakai861104@gmail.com. All complaints will be reviewed and investigated promptly and fairly.
+
+All community leaders are obligated to respect the privacy and security of the reporter of any incident.
+
+## Enforcement Guidelines
+
+Community leaders will follow these Community Impact Guidelines in determining the consequences for any action they deem in violation of this Code of Conduct:
+
+### 1. Correction
+
+**Community Impact**: Use of inappropriate language or other behavior deemed unprofessional or unwelcome in the community.
+
+**Consequence**: A private, written warning from community leaders, providing clarity around the nature of the violation and an explanation of why the behavior was inappropriate. A public apology may be requested.
+
+### 2. Warning
+
+**Community Impact**: A violation through a single incident or series of actions.
+
+**Consequence**: A warning with consequences for continued behavior. No interaction with the people involved, including unsolicited interaction with those enforcing the Code of Conduct, for a specified period of time. This includes avoiding interactions in community spaces as well as external channels like social media. Violating these terms may lead to a temporary or permanent ban.
+
+### 3. Temporary Ban
+
+**Community Impact**: A serious violation of community standards, including sustained inappropriate behavior.
+
+**Consequence**: A temporary ban from any sort of interaction or public communication with the community for a specified period of time. No public or private interaction with the people involved, including unsolicited interaction with those enforcing the Code of Conduct, is allowed during this period. Violating these terms may lead to a permanent ban.
+
+### 4. Permanent Ban
+
+**Community Impact**: Demonstrating a pattern of violation of community standards, including sustained inappropriate behavior,  harassment of an individual, or aggression toward or disparagement of classes of individuals.
+
+**Consequence**: A permanent ban from any sort of public interaction within the community.
+
+## Attribution
+
+This Code of Conduct is adapted from the [Contributor Covenant][homepage], version 2.0,
+available at https://www.contributor-covenant.org/version/2/0/code_of_conduct.html.
+
+Community Impact Guidelines were inspired by [Mozilla's code of conduct enforcement ladder](https://github.com/mozilla/diversity).
+
+[homepage]: https://www.contributor-covenant.org
+
+For answers to common questions about this code of conduct, see the FAQ at
+https://www.contributor-covenant.org/faq. Translations are available at https://www.contributor-covenant.org/translations.

CODE_OF_CONDUCT.md.meta

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CONTRIBUTING.md

@@ -0,0 +1,43 @@
+# Contributing
+
+## How to Contribute
+
+#### Code of Conduct
+
+This repository has adopted the Contributor Covenant as it's
+Code of Conduct. It is expected that participants adhere to it.
+
+#### Proposing a Change
+
+If you are unsure about whether or not a change is desired,
+you can create an issue. This is useful because it creates
+the possibility for a discussion that's visible to everyone.
+
+When fixing a bug it is fine to submit a pull request right away.
+
+#### Sending a Pull Request
+
+Steps to be performed to submit a pull request:
+
+1. Fork the repository.
+2. Clone the repository.
+3. Checkout `develop` branch.
+4. Develop the package.
+5. Test the package with the test runner (`Window > Generals > Test Runner`).
+6. Commit with a message based
+   on [Angular Commit Message Conventions](https://gist.github.com/stephenparish/9941e89d80e2bc58a153) as follows:
+
+    - `fix:` fix a bug
+    - `feat:` new feature
+    - `docs:` changes only in documentation
+    - `style:` changes only in formatting, white-space, etc
+    - `refactor:` changes only in code structure (extract method, rename variable, move method, etc)
+    - `perf:` changes only in code performance
+    - `test:` add or update tests
+    - `chore:` changes to the build process or auxiliary tools and libraries such as documentation generation
+
+7. Create a pull request on GitHub. Fill out the description, link any related issues and submit your pull request.
+
+#### License
+
+By contributing to this repository, you agree that your contributions will be licensed under its MIT license.

CONTRIBUTING.md.meta

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+TextScriptImporter:
+  externalObjects: {}
+  userData: 
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Editor/AnimatablePropertyEditor.cs

@@ -0,0 +1,142 @@
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using UnityEditor;
+using UnityEngine;
+
+namespace Coffee.UIExtensions
+{
+    internal static class AnimatablePropertyEditor
+    {
+        private static readonly GUIContent s_ContentNothing = new GUIContent("Nothing");
+        private static readonly List<string> s_ActiveNames = new List<string>();
+        private static readonly StringBuilder s_Sb = new StringBuilder();
+        private static readonly HashSet<string> s_Names = new HashSet<string>();
+
+        private static string CollectActiveNames(SerializedProperty sp, List<string> result)
+        {
+            result.Clear();
+            for (var i = 0; i < sp.arraySize; i++)
+            {
+                var spName = sp.GetArrayElementAtIndex(i).FindPropertyRelative("m_Name");
+                if (spName == null) continue;
+
+                result.Add(spName.stringValue);
+            }
+
+            s_Sb.Length = 0;
+            if (result.Count == 0)
+            {
+                s_Sb.Append("Nothing");
+            }
+            else
+            {
+                result.Aggregate(s_Sb, (a, b) =>
+                {
+                    s_Sb.Append(b);
+                    return s_Sb.Append(", ");
+                });
+                s_Sb.Length -= 2;
+            }
+
+            return s_Sb.ToString();
+        }
+
+        public static void Draw(SerializedProperty sp, List<Material> mats)
+        {
+            var pos = EditorGUILayout.GetControlRect(true);
+            var label = new GUIContent(sp.displayName, sp.tooltip);
+            var rect = EditorGUI.PrefixLabel(pos, label);
+            var text = sp.hasMultipleDifferentValues
+                ? "-"
+                : CollectActiveNames(sp, s_ActiveNames);
+
+            if (!GUI.Button(rect, text, EditorStyles.popup)) return;
+
+            var gm = new GenericMenu();
+            gm.AddItem(s_ContentNothing, s_ActiveNames.Count == 0, x =>
+            {
+                var current = (SerializedProperty)x;
+                current.ClearArray();
+                current.serializedObject.ApplyModifiedProperties();
+            }, sp);
+
+            if (!sp.hasMultipleDifferentValues)
+            {
+                for (var i = 0; i < sp.arraySize; i++)
+                {
+                    var p = sp.GetArrayElementAtIndex(i);
+                    var name = p.FindPropertyRelative("m_Name").stringValue;
+                    var type = (AnimatableProperty.ShaderPropertyType)p.FindPropertyRelative("m_Type").intValue;
+                    AddMenu(gm, sp, new ShaderProperty(name, type), false);
+                }
+            }
+
+            s_Names.Clear();
+            for (var j = 0; j < mats.Count; j++)
+            {
+                var mat = mats[j];
+                if (!mat || !mat.shader) continue;
+
+                for (var i = 0; i < ShaderUtil.GetPropertyCount(mat.shader); i++)
+                {
+                    var name = ShaderUtil.GetPropertyName(mat.shader, i);
+                    var type = (AnimatableProperty.ShaderPropertyType)ShaderUtil.GetPropertyType(mat.shader, i);
+                    if (!s_Names.Add(name)) continue;
+
+                    AddMenu(gm, sp, new ShaderProperty(name, type), true);
+
+                    if (type != AnimatableProperty.ShaderPropertyType.Texture) continue;
+
+                    AddMenu(gm, sp, new ShaderProperty($"{name}_ST"), true);
+                    AddMenu(gm, sp, new ShaderProperty($"{name}_HDR"), true);
+                    AddMenu(gm, sp, new ShaderProperty($"{name}_TexelSize"), true);
+                }
+            }
+
+            gm.ShowAsContext();
+        }
+
+        private static void AddMenu(GenericMenu menu, SerializedProperty sp, ShaderProperty prop, bool add)
+        {
+            if (add && s_ActiveNames.Contains(prop.name)) return;
+
+            var label = new GUIContent($"{prop.name} ({prop.type})");
+            menu.AddItem(label, s_ActiveNames.Contains(prop.name), () =>
+            {
+                var index = s_ActiveNames.IndexOf(prop.name);
+                if (0 <= index)
+                {
+                    sp.DeleteArrayElementAtIndex(index);
+                }
+                else
+                {
+                    sp.InsertArrayElementAtIndex(sp.arraySize);
+                    var p = sp.GetArrayElementAtIndex(sp.arraySize - 1);
+                    p.FindPropertyRelative("m_Name").stringValue = prop.name;
+                    p.FindPropertyRelative("m_Type").intValue = (int)prop.type;
+                }
+
+                sp.serializedObject.ApplyModifiedProperties();
+            });
+        }
+
+        private struct ShaderProperty
+        {
+            public readonly string name;
+            public readonly AnimatableProperty.ShaderPropertyType type;
+
+            public ShaderProperty(string name)
+            {
+                this.name = name;
+                type = AnimatableProperty.ShaderPropertyType.Vector;
+            }
+
+            public ShaderProperty(string name, AnimatableProperty.ShaderPropertyType type)
+            {
+                this.name = name;
+                this.type = type;
+            }
+        }
+    }
+}

Editor/AnimatablePropertyEditor.cs.meta

@@ -1,5 +1,5 @@
 fileFormatVersion: 2
-guid: f69dfb25b53b14addbd71dbebdbaa132
+guid: 60feb9aeb134e4ec789c0e63b017997f
 MonoImporter:
   externalObjects: {}
   serializedVersion: 2

Editor/Coffee.UIParticle.Editor.asmdef

@@ -8,5 +8,9 @@
         "Editor"
     ],
     "excludePlatforms": [],
-    "allowUnsafeCode": false
+    "allowUnsafeCode": false,
+    "overrideReferences": true,
+    "precompiledReferences": [],
+    "autoReferenced": false,
+    "defineConstraints": []
 }

Editor/UIParticleEditor.cs

@@ -0,0 +1,509 @@
+using System.Collections.Generic;
+using System.Linq;
+using System.Text.RegularExpressions;
+using UnityEditor;
+using UnityEditor.UI;
+using UnityEditorInternal;
+using UnityEngine;
+using UnityEngine.Profiling;
+using UnityEngine.UI;
+using Coffee.UIParticleExtensions;
+#if UNITY_2021_2_OR_NEWER
+using UnityEditor.Overlays;
+#else
+using System;
+using System.Reflection;
+using Object = UnityEngine.Object;
+#endif
+#if UNITY_2021_2_OR_NEWER
+using UnityEditor.SceneManagement;
+#elif UNITY_2018_3_OR_NEWER
+using UnityEditor.Experimental.SceneManagement;
+#endif
+
+namespace Coffee.UIExtensions
+{
+    [CustomEditor(typeof(UIParticle))]
+    [CanEditMultipleObjects]
+    internal class UIParticleEditor : GraphicEditor
+    {
+        //################################
+        // Constant or Static Members.
+        //################################
+        private static readonly GUIContent[] s_ContentMaterials = new[]
+        {
+            new GUIContent("Material"),
+            new GUIContent("Trail Material")
+        };
+
+        private static readonly GUIContent s_ContentRenderingOrder = new GUIContent("Rendering Order");
+        private static readonly GUIContent s_ContentRefresh = new GUIContent("Refresh");
+        private static readonly GUIContent s_ContentFix = new GUIContent("Fix");
+        private static readonly GUIContent s_Content3D = new GUIContent("3D");
+        private static readonly GUIContent s_ContentRandom = new GUIContent("Random");
+        private static readonly GUIContent s_ContentScale = new GUIContent("Scale");
+        private static readonly GUIContent s_ContentPrimary = new GUIContent("Primary");
+        private static readonly Regex s_RegexBuiltInGuid = new Regex(@"^0{16}.0{15}$", RegexOptions.Compiled);
+        private static readonly List<Material> s_TempMaterials = new List<Material>();
+        private static bool s_XYZMode;
+
+        private SerializedProperty _maskable;
+        private SerializedProperty _scale3D;
+        private SerializedProperty _animatableProperties;
+        private SerializedProperty _meshSharing;
+        private SerializedProperty _groupId;
+        private SerializedProperty _groupMaxId;
+        private SerializedProperty _positionMode;
+        private SerializedProperty _autoScalingMode;
+        private SerializedProperty _useCustomView;
+        private SerializedProperty _customViewSize;
+        private ReorderableList _ro;
+        private bool _showMax;
+
+        private static readonly HashSet<Shader> s_Shaders = new HashSet<Shader>();
+#if UNITY_2018 || UNITY_2019
+        private static readonly List<ParticleSystemVertexStream> s_Streams = new List<ParticleSystemVertexStream>();
+#endif
+        private static readonly List<string> s_MaskablePropertyNames = new List<string>
+        {
+            "_Stencil",
+            "_StencilComp",
+            "_StencilOp",
+            "_StencilWriteMask",
+            "_StencilReadMask",
+            "_ColorMask"
+        };
+
+        //################################
+        // Public/Protected Members.
+        //################################
+        /// <summary>
+        /// This function is called when the object becomes enabled and active.
+        /// </summary>
+        protected override void OnEnable()
+        {
+            base.OnEnable();
+
+            _maskable = serializedObject.FindProperty("m_Maskable");
+            _scale3D = serializedObject.FindProperty("m_Scale3D");
+            _animatableProperties = serializedObject.FindProperty("m_AnimatableProperties");
+            _meshSharing = serializedObject.FindProperty("m_MeshSharing");
+            _groupId = serializedObject.FindProperty("m_GroupId");
+            _groupMaxId = serializedObject.FindProperty("m_GroupMaxId");
+            _positionMode = serializedObject.FindProperty("m_PositionMode");
+            _autoScalingMode = serializedObject.FindProperty("m_AutoScalingMode");
+            _useCustomView = serializedObject.FindProperty("m_UseCustomView");
+            _customViewSize = serializedObject.FindProperty("m_CustomViewSize");
+
+            var sp = serializedObject.FindProperty("m_Particles");
+            _ro = new ReorderableList(sp.serializedObject, sp, true, true, true, true)
+            {
+                elementHeightCallback = index =>
+                {
+                    var ps = sp.GetArrayElementAtIndex(index).objectReferenceValue as ParticleSystem;
+                    var materialCount = 0;
+                    if (ps && ps.TryGetComponent<ParticleSystemRenderer>(out var psr))
+                    {
+                        materialCount = psr.sharedMaterials.Length;
+                    }
+
+                    return (materialCount + 1) * (EditorGUIUtility.singleLineHeight + 2);
+                },
+                drawElementCallback = (rect, index, _, __) =>
+                {
+                    rect.y += 2;
+                    rect.height = EditorGUIUtility.singleLineHeight;
+                    var p = sp.GetArrayElementAtIndex(index);
+                    EditorGUI.ObjectField(rect, p, GUIContent.none);
+                    var ps = p.objectReferenceValue as ParticleSystem;
+                    if (!ps || !ps.TryGetComponent<ParticleSystemRenderer>(out var psr)) return;
+
+                    rect.x += 15;
+                    rect.width -= 15;
+                    var materials = new SerializedObject(psr).FindProperty("m_Materials");
+                    var count = Mathf.Min(materials.arraySize, 2);
+                    for (var i = 0; i < count; i++)
+                    {
+                        rect.y += rect.height + 2;
+                        EditorGUI.PropertyField(rect, materials.GetArrayElementAtIndex(i), s_ContentMaterials[i]);
+                    }
+
+                    if (materials.serializedObject.hasModifiedProperties)
+                    {
+                        materials.serializedObject.ApplyModifiedProperties();
+                    }
+                },
+                drawHeaderCallback = rect =>
+                {
+#if !UNITY_2019_3_OR_NEWER
+                    rect.y -= 1;
+#endif
+                    var pos = new Rect(rect.x, rect.y, 150, rect.height);
+                    EditorGUI.LabelField(pos, s_ContentRenderingOrder);
+
+                    pos = new Rect(rect.width - 35, rect.y, 60, rect.height);
+                    if (GUI.Button(pos, s_ContentRefresh, EditorStyles.miniButton))
+                    {
+                        foreach (var uip in targets.OfType<UIParticle>())
+                        {
+                            uip.RefreshParticles();
+                            EditorUtility.SetDirty(uip);
+                        }
+                    }
+                }
+            };
+
+            // On select UIParticle, refresh particles.
+            if (!Application.isPlaying)
+            {
+                foreach (var uip in targets.OfType<UIParticle>())
+                {
+                    if (PrefabUtility.GetPrefabAssetType(uip) != PrefabAssetType.NotAPrefab) continue;
+                    uip.RefreshParticles(uip.particles);
+                }
+            }
+        }
+
+        /// <summary>
+        /// Implement this function to make a custom inspector.
+        /// </summary>
+        public override void OnInspectorGUI()
+        {
+            var current = target as UIParticle;
+            if (!current) return;
+
+            Profiler.BeginSample("(UIP:E) OnInspectorGUI");
+            serializedObject.Update();
+
+            // Maskable
+            EditorGUILayout.PropertyField(_maskable);
+
+            // Scale
+            EditorGUI.BeginDisabledGroup(!_meshSharing.hasMultipleDifferentValues && _meshSharing.intValue == 4);
+            s_XYZMode = DrawFloatOrVector3Field(_scale3D, s_XYZMode);
+            EditorGUI.EndDisabledGroup();
+
+            // AnimatableProperties
+            current.GetMaterials(s_TempMaterials);
+            AnimatablePropertyEditor.Draw(_animatableProperties, s_TempMaterials);
+
+            // Mesh sharing
+            EditorGUI.BeginChangeCheck();
+            _showMax = DrawMeshSharing(_meshSharing, _groupId, _groupMaxId, _showMax);
+            if (EditorGUI.EndChangeCheck())
+            {
+                serializedObject.ApplyModifiedProperties();
+                foreach (var t in targets)
+                {
+                    if (t is UIParticle uip)
+                    {
+                        uip.ResetGroupId();
+                    }
+                }
+            }
+
+            // Position Mode
+            EditorGUILayout.PropertyField(_positionMode);
+
+            // Auto Scaling
+            EditorGUILayout.PropertyField(_autoScalingMode);
+
+            // Custom View Size
+            EditorGUILayout.PropertyField(_useCustomView);
+            EditorGUI.BeginChangeCheck();
+            EditorGUI.BeginDisabledGroup(!_useCustomView.boolValue);
+            EditorGUI.indentLevel++;
+            EditorGUILayout.PropertyField(_customViewSize);
+            EditorGUI.indentLevel--;
+            EditorGUI.EndDisabledGroup();
+            if (EditorGUI.EndChangeCheck())
+            {
+                _customViewSize.floatValue = Mathf.Max(0.1f, _customViewSize.floatValue);
+            }
+
+            // Target ParticleSystems.
+            EditorGUI.BeginChangeCheck();
+            _ro.DoLayoutList();
+            serializedObject.ApplyModifiedProperties();
+
+            if (EditorGUI.EndChangeCheck())
+            {
+                EditorApplication.QueuePlayerLoopUpdate();
+                foreach (var uip in targets.OfType<UIParticle>())
+                {
+                    uip.RefreshParticles(uip.particles);
+                }
+            }
+
+            // Non-UI built-in shader is not supported.
+            Profiler.BeginSample("(UIP:E) Non-UI built-in shader is not supported.");
+            foreach (var mat in s_TempMaterials)
+            {
+                if (!mat || !mat.shader) continue;
+                var shader = mat.shader;
+                if (IsBuiltInObject(shader) && !shader.name.StartsWith("UI/"))
+                {
+                    EditorGUILayout.HelpBox(
+                        $"Built-in shader '{shader.name}' in '{mat.name}' is not supported.\n" +
+                        "Use UI shaders instead.",
+                        MessageType.Error);
+                }
+            }
+
+            Profiler.EndSample();
+
+            // Does the shader support UI masks?
+            Profiler.BeginSample("(UIP:E) Does the shader support UI masks?");
+            if (current.maskable && current.GetComponentInParent<Mask>(false))
+            {
+                foreach (var mat in s_TempMaterials)
+                {
+                    if (!mat || !mat.shader) continue;
+                    var shader = mat.shader;
+                    if (!s_Shaders.Add(shader)) continue;
+
+                    foreach (var propName in s_MaskablePropertyNames)
+                    {
+                        if (mat.HasProperty(propName)) continue;
+
+                        EditorGUILayout.HelpBox(
+                            $"Shader '{shader.name}' doesn't have '{propName}' property." +
+                            "\nThis graphic cannot be masked.",
+                            MessageType.Warning);
+                        break;
+                    }
+                }
+            }
+
+            s_TempMaterials.Clear();
+            s_Shaders.Clear();
+            Profiler.EndSample();
+
+            // UIParticle for trail should be removed.
+            var label = "This UIParticle component should be removed. The UIParticle for trails is no longer needed.";
+#pragma warning disable CS0612
+            if (FixButton(current.m_IsTrail, label))
+#pragma warning restore CS0612
+            {
+                DestroyUIParticle(current);
+            }
+
+#if UNITY_2018 || UNITY_2019
+            // (2018, 2019) Check to use 'TEXCOORD*.zw' components as custom vertex stream.
+            var allPsRenderers = targets.OfType<UIParticle>()
+                .SelectMany(x => x.particles)
+                .Where(x => x)
+                .Select(x => x.GetComponent<ParticleSystemRenderer>())
+                .ToArray();
+            if (0 < allPsRenderers.Length)
+            {
+                // Check to use 'TEXCOORD*.zw' components as custom vertex stream.
+                foreach (var psr in allPsRenderers)
+                {
+                    if (!new SerializedObject(psr).FindProperty("m_UseCustomVertexStreams").boolValue) continue;
+                    if (psr.activeVertexStreamsCount == 0) continue;
+                    psr.GetActiveVertexStreams(s_Streams);
+
+                    if (2 < s_Streams.Select(GetUsedComponentCount).Sum())
+                    {
+                        EditorGUILayout.HelpBox(
+                            $"ParticleSystem '{psr.name}' uses 'TEXCOORD*.zw' components as custom vertex stream.\n" +
+                            "UIParticle does not support it (See README.md).",
+                            MessageType.Warning);
+                    }
+
+                    s_Streams.Clear();
+                }
+            }
+#endif
+            Profiler.EndSample();
+            EditorApplication.delayCall += () => Profiler.enabled = false;
+        }
+
+        private static bool IsBuiltInObject(Object obj)
+        {
+            return AssetDatabase.IsMainAsset(obj)
+                   && AssetDatabase.TryGetGUIDAndLocalFileIdentifier(obj, out var guid, out long _)
+                   && s_RegexBuiltInGuid.IsMatch(guid);
+        }
+
+#if UNITY_2018 || UNITY_2019
+        private static int GetUsedComponentCount(ParticleSystemVertexStream s)
+        {
+            switch (s)
+            {
+                case ParticleSystemVertexStream.Position:
+                case ParticleSystemVertexStream.Normal:
+                case ParticleSystemVertexStream.Tangent:
+                case ParticleSystemVertexStream.Color:
+                    return 0;
+                case ParticleSystemVertexStream.UV:
+                case ParticleSystemVertexStream.UV2:
+                case ParticleSystemVertexStream.UV3:
+                case ParticleSystemVertexStream.UV4:
+                case ParticleSystemVertexStream.SizeXY:
+                case ParticleSystemVertexStream.StableRandomXY:
+                case ParticleSystemVertexStream.VaryingRandomXY:
+                case ParticleSystemVertexStream.Custom1XY:
+                case ParticleSystemVertexStream.Custom2XY:
+                case ParticleSystemVertexStream.NoiseSumXY:
+                case ParticleSystemVertexStream.NoiseImpulseXY:
+                    return 2;
+                case ParticleSystemVertexStream.AnimBlend:
+                case ParticleSystemVertexStream.AnimFrame:
+                case ParticleSystemVertexStream.VertexID:
+                case ParticleSystemVertexStream.SizeX:
+                case ParticleSystemVertexStream.Rotation:
+                case ParticleSystemVertexStream.RotationSpeed:
+                case ParticleSystemVertexStream.Velocity:
+                case ParticleSystemVertexStream.Speed:
+                case ParticleSystemVertexStream.AgePercent:
+                case ParticleSystemVertexStream.InvStartLifetime:
+                case ParticleSystemVertexStream.StableRandomX:
+                case ParticleSystemVertexStream.VaryingRandomX:
+                case ParticleSystemVertexStream.Custom1X:
+                case ParticleSystemVertexStream.Custom2X:
+                case ParticleSystemVertexStream.NoiseSumX:
+                case ParticleSystemVertexStream.NoiseImpulseX:
+                    return 1;
+                case ParticleSystemVertexStream.Center:
+                case ParticleSystemVertexStream.SizeXYZ:
+                case ParticleSystemVertexStream.Rotation3D:
+                case ParticleSystemVertexStream.RotationSpeed3D:
+                case ParticleSystemVertexStream.StableRandomXYZ:
+                case ParticleSystemVertexStream.VaryingRandomXYZ:
+                case ParticleSystemVertexStream.Custom1XYZ:
+                case ParticleSystemVertexStream.Custom2XYZ:
+                case ParticleSystemVertexStream.NoiseSumXYZ:
+                case ParticleSystemVertexStream.NoiseImpulseXYZ:
+                    return 3;
+                case ParticleSystemVertexStream.StableRandomXYZW:
+                case ParticleSystemVertexStream.VaryingRandomXYZW:
+                case ParticleSystemVertexStream.Custom1XYZW:
+                case ParticleSystemVertexStream.Custom2XYZW:
+                    return 4;
+            }
+
+            return 3;
+        }
+#endif
+
+        private static bool DrawMeshSharing(SerializedProperty spMeshSharing, SerializedProperty spGroupId,
+            SerializedProperty spGroupMaxId, bool showMax)
+        {
+            showMax |= spGroupId.intValue != spGroupMaxId.intValue ||
+                       spGroupId.hasMultipleDifferentValues ||
+                       spGroupMaxId.hasMultipleDifferentValues;
+
+            EditorGUILayout.BeginHorizontal();
+            EditorGUILayout.PropertyField(spMeshSharing);
+
+            EditorGUI.BeginChangeCheck();
+            showMax = GUILayout.Toggle(showMax, s_ContentRandom, EditorStyles.miniButton, GUILayout.Width(60));
+            if (EditorGUI.EndChangeCheck() && !showMax)
+            {
+                spGroupMaxId.intValue = spGroupId.intValue;
+            }
+
+            EditorGUILayout.EndHorizontal();
+
+            EditorGUI.BeginDisabledGroup(spMeshSharing.intValue == 0);
+            EditorGUI.indentLevel++;
+            EditorGUILayout.PropertyField(spGroupId);
+            if (showMax)
+            {
+                EditorGUILayout.PropertyField(spGroupMaxId);
+            }
+            else if (spMeshSharing.intValue == 1 || spMeshSharing.intValue == 4)
+            {
+                EditorGUI.BeginDisabledGroup(true);
+                var obj = UIParticleUpdater.GetPrimary(spGroupId.intValue);
+                EditorGUILayout.ObjectField(s_ContentPrimary, obj, typeof(UIParticle), false);
+                EditorGUI.EndDisabledGroup();
+            }
+
+            EditorGUI.indentLevel--;
+            EditorGUI.EndDisabledGroup();
+
+            return showMax;
+        }
+
+        private static void DrawAutoScaling(SerializedProperty prop)
+        {
+            EditorGUILayout.PropertyField(prop);
+        }
+
+        private void DestroyUIParticle(UIParticle p, bool ignoreCurrent = false)
+        {
+            if (!p || (ignoreCurrent && target == p)) return;
+
+            var cr = p.canvasRenderer;
+            DestroyImmediate(p);
+            DestroyImmediate(cr);
+
+#if UNITY_2018_3_OR_NEWER
+            var stage = PrefabStageUtility.GetCurrentPrefabStage();
+            if (stage != null && stage.scene.isLoaded)
+            {
+#if UNITY_2020_1_OR_NEWER
+                var prefabAssetPath = stage.assetPath;
+#else
+                var prefabAssetPath = stage.prefabAssetPath;
+#endif
+                PrefabUtility.SaveAsPrefabAsset(stage.prefabContentsRoot, prefabAssetPath);
+            }
+#endif
+        }
+
+        private static bool FixButton(bool show, string text)
+        {
+            if (!show) return false;
+            using (new EditorGUILayout.HorizontalScope(GUILayout.ExpandWidth(true)))
+            {
+                EditorGUILayout.HelpBox(text, MessageType.Warning, true);
+                using (new EditorGUILayout.VerticalScope())
+                {
+                    return GUILayout.Button(s_ContentFix, GUILayout.Width(30));
+                }
+            }
+        }
+
+        private static bool DrawFloatOrVector3Field(SerializedProperty sp, bool showXyz)
+        {
+            var x = sp.FindPropertyRelative("x");
+            var y = sp.FindPropertyRelative("y");
+            var z = sp.FindPropertyRelative("z");
+
+            showXyz |= !Mathf.Approximately(x.floatValue, y.floatValue) ||
+                       !Mathf.Approximately(y.floatValue, z.floatValue) ||
+                       y.hasMultipleDifferentValues ||
+                       z.hasMultipleDifferentValues;
+
+            EditorGUILayout.BeginHorizontal();
+            if (showXyz)
+            {
+                EditorGUILayout.PropertyField(sp);
+            }
+            else
+            {
+                EditorGUI.BeginChangeCheck();
+                EditorGUILayout.PropertyField(x, s_ContentScale);
+                if (EditorGUI.EndChangeCheck())
+                {
+                    y.floatValue = z.floatValue = x.floatValue;
+                }
+            }
+
+            EditorGUI.BeginChangeCheck();
+            showXyz = GUILayout.Toggle(showXyz, s_Content3D, EditorStyles.miniButton, GUILayout.Width(30));
+            if (EditorGUI.EndChangeCheck() && !showXyz)
+            {
+                z.floatValue = y.floatValue = x.floatValue;
+            }
+
+            EditorGUILayout.EndHorizontal();
+
+            return showXyz;
+        }
+    }
+}

Editor/UIParticleMenu.cs

@@ -0,0 +1,46 @@
+using UnityEditor;
+using UnityEngine;
+using UnityEngine.UI;
+
+namespace Coffee.UIExtensions
+{
+    internal class UIParticleMenu
+    {
+        [MenuItem("GameObject/UI/Particle System (Empty)", false, 2018)]
+        private static void AddParticleEmpty(MenuCommand menuCommand)
+        {
+            // Create empty UI element.
+            EditorApplication.ExecuteMenuItem("GameObject/UI/Image");
+            var ui = Selection.activeGameObject;
+            Object.DestroyImmediate(ui.GetComponent<Image>());
+
+            // Add UIParticle.
+            var uiParticle = ui.AddComponent<UIParticle>();
+            uiParticle.name = "UIParticle";
+            uiParticle.scale = 10;
+            uiParticle.rectTransform.sizeDelta = Vector2.zero;
+        }
+
+        [MenuItem("GameObject/UI/Particle System", false, 2019)]
+        private static void AddParticle(MenuCommand menuCommand)
+        {
+            // Create empty UIEffect.
+            AddParticleEmpty(menuCommand);
+            var uiParticle = Selection.activeGameObject.GetComponent<UIParticle>();
+
+            // Create ParticleSystem.
+            EditorApplication.ExecuteMenuItem("GameObject/Effects/Particle System");
+            var ps = Selection.activeGameObject;
+            ps.transform.SetParent(uiParticle.transform, false);
+            ps.transform.localPosition = Vector3.zero;
+
+            // Assign default material (UIAdditive).
+            var renderer = ps.GetComponent<ParticleSystemRenderer>();
+            var path = AssetDatabase.GUIDToAssetPath("9944483a3e009401ba5dcc42f14d5c63");
+            renderer.material = AssetDatabase.LoadAssetAtPath<Material>(path);
+
+            // Refresh particles.
+            uiParticle.RefreshParticles();
+        }
+    }
+}

Editor/UIParticleMenu.cs.meta

@@ -0,0 +1,11 @@
+fileFormatVersion: 2
+guid: 0ad158a8abf7646d6b540eed4a91a2dc
+MonoImporter:
+  externalObjects: {}
+  serializedVersion: 2
+  defaultReferences: []
+  executionOrder: 0
+  icon: {instanceID: 0}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 

Icons.meta

@@ -0,0 +1,8 @@
+fileFormatVersion: 2
+guid: 7a55e246f37df405bac88eac692e3a86
+folderAsset: yes
+DefaultImporter:
+  externalObjects: {}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 

Icons/UIParticleIcon.png.meta

@@ -0,0 +1,127 @@
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+guid: 5f0675613942149309588d556e33d990
+TextureImporter:
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+  grayScaleToAlpha: 0
+  generateCubemap: 6
+  cubemapConvolution: 0
+  seamlessCubemap: 0
+  textureFormat: 1
+  maxTextureSize: 2048
+  textureSettings:
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+    filterMode: 1
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+  spriteBorder: {x: 0, y: 0, z: 0, w: 0}
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+    androidETC2FallbackOverride: 0
+    forceMaximumCompressionQuality_BC6H_BC7: 0
+  - serializedVersion: 3
+    buildTarget: Standalone
+    maxTextureSize: 2048
+    resizeAlgorithm: 0
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+    textureCompression: 1
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+    crunchedCompression: 0
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+  - serializedVersion: 3
+    buildTarget: Server
+    maxTextureSize: 2048
+    resizeAlgorithm: 0
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+    textureCompression: 1
+    compressionQuality: 50
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+    forceMaximumCompressionQuality_BC6H_BC7: 0
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+    sprites: []
+    outline: []
+    physicsShape: []
+    bones: []
+    spriteID: 
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+    secondaryTextures: []
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+  userData: 
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+  assetBundleVariant: 

LICENSE.md

@@ -1,7 +1,7 @@
-Copyright 2018 mob-sakai
+Copyright 2018-2024 mob-sakai
 
 Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
 
 The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
 
-THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

README.md

@@ -1,152 +1,495 @@
-ParticleEffectForUGUI
-===
+# <img alt="UIParticleIcon" src="https://github.com/mob-sakai/ParticleEffectForUGUI/assets/12690315/d76e105e-a840-4f61-a1f6-8cf311c0812d" width="26"/> Particle Effect For UGUI (UI Particle)
 
-This plugin provide a component to render particle effect for uGUI in Unity 2018.2+.  
-The particle rendering is maskable and sortable, without Camera, RenderTexture or Canvas.
+This package provides a component to render particle effects for uGUI in Unity 2018.2 or later.  
+The particle rendering is maskable and sortable, without the need for an extra Camera, RenderTexture, or Canvas.
 
-[![](https://img.shields.io/github/release/mob-sakai/ParticleEffectForUGUI.svg?label=latest%20version)](https://github.com/mob-sakai/ParticleEffectForUGUI/releases)
-[![](https://img.shields.io/github/release-date/mob-sakai/ParticleEffectForUGUI.svg)](https://github.com/mob-sakai/ParticleEffectForUGUI/releases)  
-![](https://img.shields.io/badge/requirement-Unity%202018.2%2B-green.svg)
-[![](https://img.shields.io/github/license/mob-sakai/ParticleEffectForUGUI.svg)](https://github.com/mob-sakai/ParticleEffectForUGUI/blob/upm/LICENSE.md)
+[![](https://img.shields.io/npm/v/com.coffee.ui-particle?label=openupm&registry_uri=https://package.openupm.com)](https://openupm.com/packages/com.coffee.ui-particle/)
+[![](https://img.shields.io/github/v/release/mob-sakai/ParticleEffectForUGUI?include_prereleases)](https://github.com/mob-sakai/ParticleEffectForUGUI/releases)
+[![](https://img.shields.io/github/license/mob-sakai/ParticleEffectForUGUI.svg)](https://github.com/mob-sakai/ParticleEffectForUGUI/blob/main/LICENSE.txt)  
+![](https://img.shields.io/badge/Unity-2018.2+-57b9d3.svg?style=flat&logo=unity)
+![](https://github.com/mob-sakai/ParticleEffectForUGUI/actions/workflows/test.yml/badge.svg?branch=develop)
 [![PRs Welcome](https://img.shields.io/badge/PRs-welcome-orange.svg)](http://makeapullrequest.com)
 [![](https://img.shields.io/twitter/follow/mob_sakai.svg?label=Follow&style=social)](https://twitter.com/intent/follow?screen_name=mob_sakai)
 
+<< [📝 Description](#-description) | [🎮 Demo](#-demo) | [⚙ Installation](#-installation) | [🚀 Usage](#-usage) | [🛠 Development Note](#-development-note) | [🤝 Contributing](#-contributing) >>
 
+<br><br>
 
-<< [Description](#Description) | [WebGL Demo](#demo) | [Download](https://github.com/mob-sakai/ParticleEffectForUGUI/releases) | [Usage](#usage) | [Development Note](#development-note) | [Change log](https://github.com/mob-sakai/ParticleEffectForUGUI/blob/upm/CHANGELOG.md) >>
+## 📝 Description
 
-### What's new? Please see [See changelog ![](https://img.shields.io/github/release-date/mob-sakai/ParticleEffectForUGUI.svg?label=last%20updated)](https://github.com/mob-sakai/ParticleEffectForUGUI/blob/upm/CHANGELOG.md)
-### Do you want to receive notifications for new releases? [Watch this repo ![](https://img.shields.io/github/watchers/mob-sakai/ParticleEffectForUGUI.svg?style=social&label=Watch)](https://github.com/mob-sakai/ParticleEffectForUGUI/subscription)
-### Support me on Patreon! [![become_a_patron](https://user-images.githubusercontent.com/12690315/50731629-3b18b480-11ad-11e9-8fad-4b13f27969c1.png)](https://www.patreon.com/join/2343451?)
+![Demo](https://user-images.githubusercontent.com/12690315/41771577-8da4b968-7650-11e8-9524-cd162c422d9d.gif)
 
+This package uses the new APIs `MeshBake/MeshTrailBake` (introduced in Unity 2018.2) to render particles through CanvasRenderer.  
+You can render, mask, and sort your ParticleSystems for UI without the need for an additional Camera, RenderTexture, or Canvas.
 
+### Key Features
 
-<br><br><br><br>
-## Description
+* **Easy to use:** The package is ready to use out of the box.
+* **Sortable:** Sort particle effects and other UI elements by sibling index.
+* **Maskable:** Supports `Mask` or `RectMask2D`.
+* **No extra components required:** No need for an additional `Camera`, `RenderTexture`, or `Canvas`.
+* **Trail module support:** Fully supports the Trail module.
+* **CanvasGroup alpha support:** Integrates with `CanvasGroup` alpha.
+* **No allocations:** Efficiently renders particles without allocations.
+* **Any canvas render mode support:** Works with overlay, camera space, and world space.
+* **Any Render pipeline support:** Compatible with Universal Render Pipeline (URP) and High Definition Render Pipeline (HDRP).
+* **Disabling domain reload support:** Supports disabling `Enter Play Mode Options > Reload Domain`.
+* **Animatable material properties:** Supports changing material properties with AnimationClip (AnimatableProperty).  
+  ![AnimatableProperty.gif](https://user-images.githubusercontent.com/12690315/53286323-2d94a980-37b0-11e9-8afb-c4a207805ff2.gif)
+* **Multiple materials:** Supports 8+ materials.
+* **Correct positioning:** Adjusts world space particle positions correctly when changing window size for standalone platforms (Windows, MacOSX, and Linux).
+* **Adaptive scaling:** Provides adaptive scaling for UI (AutoScalingMode).
+* **Performance optimization:** Mesh sharing group to improve performance.  
+  <img alt="MeshSharing.gif" src="https://user-images.githubusercontent.com/12690315/174311048-c882df81-6c34-4eba-b0aa-5645457692f1.gif" width="450"/>
+* **Particle attractor:** Includes a particle attractor component.  
+  <img alt="ParticleAttractor.gif" src="https://user-images.githubusercontent.com/12690315/174311027-462929a4-13f0-4ec4-86ea-9c832f2eecf1.gif" width="450"/>
+* **Emission position mode:** Supports relative/absolute particle emission position modes.  
+  <img alt="AbsolutePosition.gif" src="https://user-images.githubusercontent.com/12690315/175751579-5a2357e8-2ecf-4afd-83c8-66e9771bde39.gif" width="450"/>
+* **Custom view size:** Fixes min/max particle size mismatch.  
+  ![CustomViewSize.gif](https://github.com/mob-sakai/ParticleEffectForUGUI/assets/12690315/dd929959-1a37-420b-b13d-e849022b9c9d)
 
-![](https://user-images.githubusercontent.com/12690315/41771577-8da4b968-7650-11e8-9524-cd162c422d9d.gif)
+<br><br>
 
-This plugin uses new APIs `MeshBake/MashTrailBake` (added with Unity 2018.2) to render particles by CanvasRenderer.
-You can mask and sort particles for uGUI without Camera, RenderTexture, Canvas.
+## 🎮 Demo
 
-Compares this "Baking mesh" approach with the conventional approach:  
-(This scene is included in the package.)
+* [WebGL Demo](https://mob-sakai.github.io/demos/UIParticle_Demo/index.html)
 
-|Approach|Good|Bad|Screenshot|
-|-|-|-|-|
-|Baking mesh<br>**\(UIParticle\)**|Rendered as is.<br>Maskable.<br>Sortable.<br>Less objects.|**Requires Unity 2018.2+.**<br>Requires UI shaders to use Mask.|<img src="https://user-images.githubusercontent.com/12690315/41765089-0302b9a2-763e-11e8-88b3-b6ffa306bbb0.gif" width="500px">|
-|Do nothing|Rendered as is.|**Looks like a glitch.**<br>Not maskable.<br>Not sortable.|<img src="https://user-images.githubusercontent.com/12690315/41765090-0329828a-763e-11e8-8d8a-f1d269ea3bc7.gif" width="500px">|
-|Convert particle to UIVertex<br>[\(UIParticleSystem\)](https://forum.unity.com/threads/free-script-particle-systems-in-ui-screen-space-overlay.406862/)|Maskable.<br>Sortable.<br>Less objects.|**Adjustment is difficult.**<br>Requires UI shaders.<br>Difficult to adjust scale.<br>Force hierarchy scalling.<br>Simulation results are incorrect.<br>Trail, rotation of transform, time scaling are not supported.<br>Generate heavy GC every frame.|<img src="https://user-images.githubusercontent.com/12690315/41765088-02deb9c6-763e-11e8-98d0-9e0c1766ef39.gif" width="500px">|
-|Use Canvas to sort|Rendered as is.<br>Sortable.|**You must to manage sorting orders.**<br>Not maskable.<br>More batches.|<img src="https://user-images.githubusercontent.com/12690315/41765087-02b866ea-763e-11e8-8c33-081c9ad852f8.gif" width="500px">|
-|Use RenderTexture|Maskable.<br>Sortable.|**Requires Camera and RenderTexture.**<br>Difficult to adjust position and size.<br>Quality depends on the RenderTexture's setting.|<img src="https://user-images.githubusercontent.com/12690315/41765085-0291b3e2-763e-11e8-827b-72e5ee9bc556.gif" width="500px">|
+> ![](https://user-images.githubusercontent.com/12690315/174311768-1843a5f2-f776-491b-aaa8-2a131a8b6a16.gif)
 
+* [WebGL Demo (Cartoon FX & War FX)](https://mob-sakai.github.io/Demos/ParticleEffectForUGUI_CFX)
+    * [Cartoon FX Free][CFX] & [War FX][WFX] (by [Jean Moreno (JMO)][JMO]) with UIParticle
 
-#### Features
+> ![](https://user-images.githubusercontent.com/12690315/91664766-3e07ac00-eb2c-11ea-978b-ef723be80619.gif)
 
-* Sort particle effects with uGUI
-* No Camera, RenderTexture or Canvas are required
-* Masking with Mask or RectMask2D
-* Easy to use
-* Support Trail module
-* Change alpha with CanvasGroup
-* Scaling independent of Transform
-* No heavy allocation every frame
-* All ParticleSystem.ScalingModes and all Canvas.RenderModes are supported. They look almost the same in all modes.
-![](https://user-images.githubusercontent.com/12690315/49866926-6c22f500-fe4c-11e8-8393-d5a546e9e2d3.gif)
-* Scaled gizmo  
-![](https://user-images.githubusercontent.com/12690315/50343861-f31e4e80-056b-11e9-8f60-8bd0a8ff7adb.gif)
+[CFX]: https://assetstore.unity.com/packages/vfx/particles/cartoon-fx-free-109565
 
+[WFX]: https://assetstore.unity.com/packages/vfx/particles/war-fx-5669
 
+[JMO]: https://assetstore.unity.com/publishers/1669
 
-<br><br><br><br>
-## Demo
+<br><br>
 
-[WebGL Demo](http://mob-sakai.github.io/ParticleEffectForUGUI)
+## ⚙ Installation
 
+_This package requires **Unity 2018.3 or later**._
 
+#### Install via OpenUPM
 
-<br><br><br><br>
-## Install
+- This package is available on [OpenUPM](https://openupm.com) package registry.
+- This is the preferred method of installation, as you can easily receive updates as they're released.
+- If you have [openupm-cli](https://github.com/openupm/openupm-cli) installed, then run the following command in your project's directory:
+  ```
+  openupm add com.coffee.ui-particle
+  ```
+- To update the package, use Package Manager UI (`Window > Package Manager`) or run the following command with `@{version}`:
+  ```
+  openupm add com.coffee.ui-particle@4.8.0
+  ```
 
-#### Using UnityPackageManager (for Unity 2018.3+)
+#### Install via UPM (with Package Manager UI)
 
-Find the manifest.json file in the Packages folder of your project and edit it to look like this:
-```js
+- Click `Window > Package Manager` to open Package Manager UI.
+- Click `+ > Add package from git URL...` and input the repository URL: `https://github.com/mob-sakai/ParticleEffectForUGUI.git`  
+  ![](https://gist.github.com/assets/12690315/24af63ed-8a2e-483d-9023-7aa53d913330)
+- To update the package, change suffix `#{version}` to the target version.
+  - e.g. `https://github.com/mob-sakai/ParticleEffectForUGUI.git#4.8.0`
+
+#### Install via UPM (Manually)
+
+- Open the `Packages/manifest.json` file in your project. Then add this package somewhere in the `dependencies` block:
+  ```json
+  {
+    "dependencies": {
+      "com.coffee.ui-particle": "https://github.com/mob-sakai/ParticleEffectForUGUI.git",
+      ...
+    }
+  }
+  ```
+
+- To update the package, change suffix `#{version}` to the target version.
+  - e.g. `"com.coffee.ui-particle": "https://github.com/mob-sakai/ParticleEffectForUGUI.git#4.8.0",`
+
+#### Install as Embedded Package
+
+1. Download a source code zip file from [Releases](https://github.com/mob-sakai/ParticleEffectForUGUI.git/releases) and extract it.
+2. Place it in your project's `Packages` directory.  
+   ![](https://github.com/mob-sakai/mob-sakai/assets/12690315/0b7484b4-5fca-43b0-a9ef-e5dbd99bcdb4)
+- If you want to fix bugs or add features, install it as an embedded package.
+- To update the package, you need to re-download it and replace the contents.
+
+<br><br>
+
+## 🚀 Usage
+
+### UIParticle Component
+
+`UIParticle` controls the ParticleSystems that are attached to its own game objects and child game objects.
+
+![](https://github.com/mob-sakai/ParticleEffectForUGUI/assets/12690315/1cf5753b-33fc-4cef-91c3-413c515a954f)
+
+- **Maskable**: Does this graphic allow maskable.
+- **Scale**: Scale the rendering particles. When the `3D` toggle is enabled, 3D scale (x, y, z) is supported.
+- **Animatable Properties**: If you want to update material properties (e.g., `_MainTex_ST`, `_Color`) in AnimationClip,
+  use this to mark as animatable.
+- **Mesh Sharing**: Particle simulation results are shared within the same group. A large number of the same effects can
+  be displayed with a small load. When the `Random` toggle is enabled, it will be grouped randomly.
+  - **None:** Disable mesh sharing.
+  - **Auto:** Automatically select Primary/Replica.
+  - **Primary:** Provides particle simulation results to the same group.
+  - **Primary Simulator:** Primary, but do not render the particle (simulation only).
+  - **Replica:** Render simulation results provided by the primary.
+- **Position Mode**: Emission position mode.
+  - **Absolute:** The particles will be emitted from the world position.
+  - **Relative:** The particles will be emitted from the scaled position.
+- **Auto Scaling Mode**: How to automatically adjust when the Canvas scale is changed by the screen size or reference resolution.
+  - **None:** Do nothing.
+  - **Transform:** Transform.lossyScale (=world scale) will be set to (1, 1, 1).
+  - **UIParticle:** UIParticle.scale will be adjusted.
+- **Use Custom View:** Use this if the particles are not displayed correctly due to min/max particle size.
+  - **Custom view size:** Change the bake view size.
+- **Rendering Order**: The ParticleSystem list to be rendered. You can change the order and the materials.
+
+**NOTE:** Press the `Refresh` button to reconstruct the rendering order based on children ParticleSystem's sorting order
+and z-position.
+
+<br><br>
+
+#### Basic Usage
+
+1. Select `GameObject/UI/ParticleSystem` to create UIParticle with a ParticleSystem.
+   ![particle](https://user-images.githubusercontent.com/12690315/95007361-cad0e880-0649-11eb-8835-f145d62c5977.png)
+2. Adjust the ParticleSystem as you like.
+   ![particle1](https://user-images.githubusercontent.com/12690315/95007359-ca385200-0649-11eb-8383-627c9750bda8.png)
+
+<br>
+
+#### With Your Existing ParticleSystem Prefab
+
+1. Select `GameObject/UI/ParticleSystem (Empty)` to create UIParticle.
+   ![empty](https://user-images.githubusercontent.com/12690315/95007362-cb697f00-0649-11eb-8a09-29b0a13791e4.png)
+2. Drag and drop your ParticleSystem prefab onto UIParticle.
+   ![particle3](https://user-images.githubusercontent.com/12690315/95007356-c6a4cb00-0649-11eb-9316-562f4bce3f31.png)
+
+<br>
+
+#### With `Mask` or `RectMask2D` Component
+
+If you want to mask particles, set a stencil-supported shader (such as `UI/UIAdditive`) to the material for
+ParticleSystem.
+If you use some custom shaders, see
+the [How to Make a Custom Shader to Support Mask/RectMask2D Component](#how-to-make-a-custom-shader-to-support-maskrectmask2d-component)
+section.
+
+![](https://user-images.githubusercontent.com/12690315/95017591-3b512700-0695-11eb-864e-04166ea1809a.png)
+
+<br><br>
+
+### Script usage
+
+```cs
+// Instantiate ParticleSystem prefab with UIParticle on runtime.
+var go = GameObject.Instantiate(prefab);
+var uiParticle = go.AddComponent<UIParticle>();
+uiParticle.scale = 100;
+
+// Control by ParticleSystem.
+particleSystem.Play();
+particleSystem.Emit(10);
+
+// Control by UIParticle.
+uiParticle.Play();
+uiParticle.Stop();
+```
+
+<br><br>
+
+### UIParticleAttractor component
+
+`UIParticleAttractor` attracts particles generated by the specified ParticleSystem.
+
+![](https://github.com/mob-sakai/ParticleEffectForUGUI/assets/12690315/5c20ad73-4b9a-4f38-9cdc-119df5cce077)
+![](https://user-images.githubusercontent.com/12690315/174311027-462929a4-13f0-4ec4-86ea-9c832f2eecf1.gif)
+
+- **Particle System**: Attracts particles generated by the specified particle system.
+- **Destination Radius**: Once the particle is within the radius, the particle lifetime will become 0, and `OnAttracted`
+  will be called.
+- **Delay Rate**: Delay to start attracting. It is a percentage of the particle's start lifetime.
+- **Max Speed**: Maximum speed of attracting. If this value is too small, attracting may not be completed by the end of
+  the lifetime, and `OnAttracted` may not be called.
+- **Movement**: Attracting movement type. (`Linear`, `Smooth`, `Sphere`)
+- **Update Mode**: Update mode.
+    - **Normal:** Update with scaled delta time.
+    - **Unscaled Time:** Update with unscaled delta time.
+- **OnAttracted**: An event called when attracting is complete (per particle).
+
+<br><br>
+
+## 🛠 Development Note
+
+### Compares the Baking mesh approach with the conventional approach
+
+- **Baking mesh approach (=UIParticle)**  
+  ![](https://user-images.githubusercontent.com/12690315/41765089-0302b9a2-763e-11e8-88b3-b6ffa306bbb0.gif)
+    - ✅ Rendered as is.
+    - ✅ Maskable.
+    - ✅ Sortable.
+    - ✅ Less objects.
+
+- **Do nothing (=Plain ParticleSystem)**  
+  ![](https://user-images.githubusercontent.com/12690315/41765090-0329828a-763e-11e8-8d8a-f1d269ea3bc7.gif)
+    - ✅ Rendered as is.
+    - ❌ Looks like a glitch.
+    - ❌ Not maskable.
+    - ❌ Not sortable.
+
+- **Convert particle to UIVertex (=[UIParticleSystem][UIParticleSystem])**  
+  ![](https://user-images.githubusercontent.com/12690315/41765088-02deb9c6-763e-11e8-98d0-9e0c1766ef39.gif)
+    - ✅ Maskable.
+    - ✅ Sortable.
+    - ❌ Adjustment is difficult.
+    - ❌ Requires UI shaders.
+    - ❌ Difficult to adjust scale.
+    - ❌ Force hierarchy scalling.
+    - ❌ Simulation results are incorrect.
+    - ❌ Trail, rotation of transform, time scaling are not supported.
+    - ❌ Generate heavy GC every frame.
+
+- **Use Canvas to sort (Sorting By Canvas )**  
+  ![](https://user-images.githubusercontent.com/12690315/41765087-02b866ea-763e-11e8-8c33-081c9ad852f8.gif)
+    - ✅ Rendered as is.
+    - ✅ Sortable.
+    - ❌ You must to manage sorting orders.
+    - ❌ Not maskable.
+    - ❌ More batches.
+    - ❌ Requires Canvas.
+
+- **Use RenderTexture**  
+  ![](https://user-images.githubusercontent.com/12690315/41765085-0291b3e2-763e-11e8-827b-72e5ee9bc556.gif)
+    - ✅ Maskable.
+    - ✅ Sortable.
+    - ❌ Requires Camera and RenderTexture.
+    - ❌ Difficult to adjust position and size.
+    - ❌ Quality depends on the RenderTexture's setting.
+
+[UIParticleSystem]: https://forum.unity.com/threads/free-script-particle-systems-in-ui-screen-space-overlay.406862/
+
+#### [Performance test results](https://github.com/mob-sakai/ParticleEffectForUGUI/issues/193#issuecomment-1160028374)
+
+| Approach                    | FPS on Editor | FPS on iPhone6 | FPS on Xperia XZ |
+|-----------------------------|---------------|----------------|------------------|
+| Particle System             | 43            | 57             | 22               |
+| UIParticleSystem            | 4             | 3              | 0 (unmeasurable) |
+| Sorting By Canvas           | 43            | 44             | 18               |
+| UIParticle                  | 17            | 12             | 4                |
+| UIParticle with MeshSharing | 44            | 45             | 30               |
+
+### 🔍 FAQ: Why Are My UIParticles Not Displayed Correctly?
+
+If `ParticleSystem` alone displays particles correctly but `UIParticle` does not, please check the following points:
+
+- [Shader Limitation](#shader-limitation)
+    - `UIParticle` does not support all built-in shaders except for `UI/Default`.
+    - Most cases can be solved by using `UI/Additive` or `UI/Default`.
+- Particles are not masked
+    - `UIParticle` is maskable.
+    - Set `Mask` or `RectMask2D` component properly.
+    - [Use maskable/clipable shader](#how-to-make-a-custom-shader-to-support-maskrectmask2d-component) (such
+      as `UI/Additive` or `UI/Default`)
+- Particles are too small
+    - If particles are small enough, they will not appear on the screen.
+    - Increase the `Scale` value.
+    - If you don't want to change the apparent size depending on the resolution, try the `Auto Scaling` option.
+- Particles are too many
+    - No more than 65535 vertices can be displayed (for mesh combination limitations).
+    - Please set `Emission` module and `Max Particles` of ParticleSystem properly.
+- Particles are emitted off-screen.
+    - When `Position Mode = Relative`, particles are emitted from the scaled position of the ParticleSystem, not from
+      the screen point of the ParticleSystem.
+    - Place the ParticleSystem in the proper position or try `Position Mode = Absolute`.
+- Attaching `UIParticle` to the same object as `ParticleSystem`
+    - `Transform.localScale` will be overridden by the `Auto Scaling` option.
+    - It is recommended to place `ParticleSystem` under `UIParticle`.
+- If `Transform.localScale` contains 0, rendering will be skipped.
+- Displayed particles are in the correct position but too large/too small
+    - Adjust `ParticleSystem.renderer.Min/MaxParticleSize`.
+
+<br>
+
+### Shader Limitation
+
+The use of UI shaders is recommended.
+
+- If you need a simple Additive shader, use the `UI/Additive` shader instead.
+- If you need a simple alpha-blend shader, use the `UI/Default` shader instead.
+- If your custom shader does not work properly with UIParticle, consider creating a custom UI shader.
+
+#### Built-in shaders are not supported
+
+`UIParticle` does not support all built-in shaders except for `UI/Default`.  
+If their use is detected, an error is displayed in the inspector.  
+Use UI shaders instead.
+
+#### (Unity 2018 or 2019) UV.zw components will be discarded
+
+UIParticleRenderer renders the particles based on UIVertex.  
+Therefore, only the xy components are available for each UV in the shader. (zw components will be discarded).  
+So unfortunately, UIParticles will not work well with some shaders.
+
+#### (Unity 2018 or 2019) Custom vertex streams
+
+When using custom vertex streams, you can fill zw components with "unnecessary" data.  
+Refer to [this issue](https://github.com/mob-sakai/ParticleEffectForUGUI/issues/191) for more information.
+
+<br>
+
+### Overheads
+
+UIParticle has some overheads, and the batching depends on uGUI.  
+When improving performance, keep the following in mind:
+
+- If you are displaying a large number of the same effect, consider the `Mesh Sharing` feature in
+  the [UIParticle Component](#uiparticle-component).
+    - If you don't like the uniform output, consider the `Random Group` feature.  
+      ![](https://user-images.githubusercontent.com/12690315/174311048-c882df81-6c34-4eba-b0aa-5645457692f1.gif)
+- If you are using multiple materials, you will have more draw calls.
+    - Consider a single material, atlasing the sprites, and using `Sprite` mode in the `Texture Sheet Animation` module
+      in the ParticleSystem.
+
+### How to Make a Custom Shader to Support Mask/RectMask2D Component
+
+<details>
+<summary>Shader tips</summary>
+
+```ShaderLab
+Shader "Your/Custom/Shader"
 {
-  "dependencies": {
-    "com.coffee.ui-particle": "https://github.com/mob-sakai/ParticleEffectForUGUI.git#2.1.0",
-    ...
-  },
+    Properties
+    {
+        // ...
+        // #### required for Mask ####
+        _StencilComp ("Stencil Comparison", Float) = 8
+        _Stencil ("Stencil ID", Float) = 0
+        _StencilOp ("Stencil Operation", Float) = 0
+        _StencilWriteMask ("Stencil Write Mask", Float) = 255
+        _StencilReadMask ("Stencil Read Mask", Float) = 255
+        _ColorMask ("Color Mask", Float) = 15
+        [Toggle(UNITY_UI_ALPHACLIP)] _UseUIAlphaClip ("Use Alpha Clip", Float) = 0
+    }
+
+    SubShader
+    {
+        Tags
+        {
+            // ...
+        }
+
+        // #### required for Mask ####
+        Stencil
+        {
+            Ref [_Stencil]
+            Comp [_StencilComp]
+            Pass [_StencilOp]
+            ReadMask [_StencilReadMask]
+            WriteMask [_StencilWriteMask]
+        }
+        ColorMask [_ColorMask]
+        // ...
+
+        Pass
+        {
+            // ...
+            // #### required for RectMask2D ####
+            #include "UnityUI.cginc"
+            #pragma multi_compile __ UNITY_UI_CLIP_RECT
+            float4 _ClipRect;
+
+            // #### required for Mask ####
+            #pragma multi_compile __ UNITY_UI_ALPHACLIP
+
+            struct appdata_t
+            {
+                // ...
+            };
+
+            struct v2f
+            {
+                // ...
+                // #### required for RectMask2D ####
+                float4 worldPosition    : TEXCOORD1;
+            };
+            
+            v2f vert(appdata_t v)
+            {
+                v2f OUT;
+                // ...
+                // #### required for RectMask2D ####
+                OUT.worldPosition = v.vertex;
+                return OUT;
+            }
+
+            fixed4 frag(v2f IN) : SV_Target
+            {
+                // ...
+                // #### required for RectMask2D ####
+                #ifdef UNITY_UI_CLIP_RECT
+                    color.a *= UnityGet2DClipping(IN.worldPosition.xy, _ClipRect);
+                #endif
+
+                // #### required for Mask ####
+                #ifdef UNITY_UI_ALPHACLIP
+                    clip (color.a - 0.001);
+                #endif
+
+                return color;
+            }
+            ENDCG
+        }
+    }
 }
 ```
-To update the package, change `#{version}` to the target version.
 
-#### Using .unitypackage file (for Unity 2018.2+)
+</details>
 
-Download `*.unitypackage` from [Releases](https://github.com/mob-sakai/ParticleEffectForUGUI/releases) and import the package into your Unity project.  
-Select `Assets > Import Package > Custom Package` from the menu.  
-![](https://user-images.githubusercontent.com/12690315/46570979-edbb5a00-c9a7-11e8-845d-c5ee279effec.png)
+<br><br>
 
+## 🤝 Contributing
 
+### Issues
 
-<br><br><br><br>
-## How to play demo
+Issues are incredibly valuable to this project:
 
-* Import `UIParticle_Demo.unitypackage` into your project.  
-* The demo unitypackage exists in `Assets/Assets/Coffee/UIExtensions/UIParticle` or `Packages/UI Particle`.  
-* Open UIParticle_Demo scene and play it.
+- Ideas provide a valuable source of contributions that others can make.
+- Problems help identify areas where this project needs improvement.
+- Questions indicate where contributors can enhance the user experience.
 
+### Pull Requests
 
+Pull requests offer a fantastic way to contribute your ideas to this repository.  
+Please refer to [CONTRIBUTING.md](https://github.com/mob-sakai/ParticleEffectForUGUI/blob/main/CONTRIBUTING.md)
+and [develop branch](https://github.com/mob-sakai/ParticleEffectForUGUI/tree/develop) for guidelines.
 
-<br><br><br><br>
-## Usage
+### Support
 
-1. Add your particle effect to canvas.
-2. (Option) If you want to mask particles, set a UI shader such as "UI/UIAdditive" to material for ParticleSystem.  
-![](https://user-images.githubusercontent.com/12690315/42674022-134e3a40-86a9-11e8-8f44-a110d2f14185.gif)
-3. Add `UIParticle` component to root particle system of your effect from `Add Component` in inspector.  
-![](https://user-images.githubusercontent.com/12690315/41772125-5aca69c8-7652-11e8-8442-21f6015069a1.png)
-4. If your effect consists of multiple ParticleSystems, click "Fix".  
-![](https://user-images.githubusercontent.com/12690315/49148942-1c243880-f34c-11e8-9cf5-d871d65c4dbe.png)
-5. Adjust the Scale property to change the size of the effect.  
-![](https://user-images.githubusercontent.com/12690315/49148937-19c1de80-f34c-11e8-87fc-138192777540.gif)
-6.  Enjoy!
+This is an open-source project developed during my spare time.  
+If you appreciate it, consider supporting me.  
+Your support allows me to dedicate more time to development. 😊
 
+[![](https://user-images.githubusercontent.com/12690315/50731629-3b18b480-11ad-11e9-8fad-4b13f27969c1.png)](https://www.patreon.com/join/2343451?)  
+[![](https://user-images.githubusercontent.com/12690315/66942881-03686280-f085-11e9-9586-fc0b6011029f.png)](https://github.com/users/mob-sakai/sponsorship)
 
-##### Requirement
+<br><br>
 
-* Unity 2018.2+ (Tested in Unity 2018.2.0f2)
-* No other SDK are required
-
-
-
-
-<br><br><br><br>
-## Development Note
-
-
-
-
-<br><br><br><br>
 ## License
 
 * MIT
-* © UTJ/UCL
-
-
 
 ## Author
 
-[mob-sakai](https://github.com/mob-sakai)
-[![](https://img.shields.io/twitter/follow/mob_sakai.svg?label=Follow&style=social)](https://twitter.com/intent/follow?screen_name=mob_sakai)  
-[![become_a_patron](https://user-images.githubusercontent.com/12690315/50731629-3b18b480-11ad-11e9-8fad-4b13f27969c1.png)](https://www.patreon.com/join/2343451?)
-
-
+* ![](https://user-images.githubusercontent.com/12690315/96986908-434a0b80-155d-11eb-8275-85138ab90afa.png) [mob-sakai](https://github.com/mob-sakai) [![](https://img.shields.io/twitter/follow/mob_sakai.svg?label=Follow&style=social)](https://twitter.com/intent/follow?screen_name=mob_sakai) ![GitHub followers](https://img.shields.io/github/followers/mob-sakai?style=social)
 
 ## See Also
 
 * GitHub page : https://github.com/mob-sakai/ParticleEffectForUGUI
 * Releases : https://github.com/mob-sakai/ParticleEffectForUGUI/releases
 * Issue tracker : https://github.com/mob-sakai/ParticleEffectForUGUI/issues
-* Current project : https://github.com/mob-sakai/ParticleEffectForUGUI/projects/1
-* Change log : https://github.com/mob-sakai/ParticleEffectForUGUI/blob/upm/CHANGELOG.md
+* Change log : https://github.com/mob-sakai/ParticleEffectForUGUI/blob/main/CHANGELOG.md

Runtime/AnimatableProperty.cs

@@ -0,0 +1,75 @@
+using System;
+using UnityEngine;
+
+namespace Coffee.UIExtensions
+{
+    [Serializable]
+    public class AnimatableProperty : ISerializationCallbackReceiver
+    {
+        public enum ShaderPropertyType
+        {
+            Color,
+            Vector,
+            Float,
+            Range,
+            Texture
+        }
+
+        [SerializeField] private string m_Name = "";
+        [SerializeField] private ShaderPropertyType m_Type = ShaderPropertyType.Vector;
+        public int id { get; private set; }
+
+        public ShaderPropertyType type => m_Type;
+
+        void ISerializationCallbackReceiver.OnBeforeSerialize()
+        {
+        }
+
+        void ISerializationCallbackReceiver.OnAfterDeserialize()
+        {
+            id = Shader.PropertyToID(m_Name);
+        }
+
+        public void UpdateMaterialProperties(Material material, MaterialPropertyBlock mpb)
+        {
+            if (!material.HasProperty(id)) return;
+
+            switch (type)
+            {
+                case ShaderPropertyType.Color:
+                    var color = mpb.GetColor(id);
+                    if (color != default)
+                    {
+                        material.SetColor(id, color);
+                    }
+
+                    break;
+                case ShaderPropertyType.Vector:
+                    var vector = mpb.GetVector(id);
+                    if (vector != default)
+                    {
+                        material.SetVector(id, vector);
+                    }
+
+                    break;
+                case ShaderPropertyType.Float:
+                case ShaderPropertyType.Range:
+                    var value = mpb.GetFloat(id);
+                    if (!Mathf.Approximately(value, 0))
+                    {
+                        material.SetFloat(id, value);
+                    }
+
+                    break;
+                case ShaderPropertyType.Texture:
+                    var tex = mpb.GetTexture(id);
+                    if (tex != default(Texture))
+                    {
+                        material.SetTexture(id, tex);
+                    }
+
+                    break;
+            }
+        }
+    }
+}

Runtime/AnimatableProperty.cs.meta

@@ -0,0 +1,11 @@
+fileFormatVersion: 2
+guid: c434da72184404a0cbdf8e7a529a41bf
+MonoImporter:
+  externalObjects: {}
+  serializedVersion: 2
+  defaultReferences: []
+  executionOrder: 0
+  icon: {instanceID: 0}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 

Runtime/ModifiedMaterial.cs

@@ -0,0 +1,72 @@
+using System.Collections.Generic;
+using UnityEngine;
+
+namespace Coffee.UIParticleExtensions
+{
+    internal class ModifiedMaterial
+    {
+        private static readonly List<MatEntry> s_Entries = new List<MatEntry>();
+
+        public static Material Add(Material baseMat, Texture texture, int id, int props)
+        {
+            MatEntry e;
+            for (var i = 0; i < s_Entries.Count; i++)
+            {
+                e = s_Entries[i];
+                if (e.baseMat != baseMat || e.texture != texture || e.id != id || e.props != props) continue;
+                ++e.count;
+                return e.customMat;
+            }
+
+            e = new MatEntry
+            {
+                count = 1,
+                baseMat = baseMat,
+                texture = texture,
+                id = id,
+                props = props,
+                customMat = new Material(baseMat)
+                {
+                    name = $"{baseMat.name}_{id}",
+                    hideFlags = HideFlags.DontSave | HideFlags.NotEditable,
+                    mainTexture = texture ? texture : baseMat.mainTexture
+                }
+            };
+            s_Entries.Add(e);
+            //Debug.LogFormat(">>>> ModifiedMaterial.Add -> count = count:{0}, mat:{1}, tex:{2}, id:{3}", s_Entries.Count, baseMat, texture, id);
+            return e.customMat;
+        }
+
+        public static void Remove(Material customMat)
+        {
+            if (!customMat) return;
+
+            for (var i = 0; i < s_Entries.Count; ++i)
+            {
+                var e = s_Entries[i];
+                if (e.customMat != customMat) continue;
+                if (--e.count == 0)
+                {
+                    //Debug.LogFormat(">>>> ModifiedMaterial.Remove -> count:{0}, mat:{1}, tex:{2}, id:{3}", s_Entries.Count - 1, e.customMat, e.texture, e.id);
+                    Misc.DestroyImmediate(e.customMat);
+                    e.customMat = null;
+                    e.baseMat = null;
+                    e.texture = null;
+                    s_Entries.RemoveAt(i);
+                }
+
+                break;
+            }
+        }
+
+        private class MatEntry
+        {
+            public Material baseMat;
+            public int count;
+            public Material customMat;
+            public int id;
+            public int props;
+            public Texture texture;
+        }
+    }
+}

Runtime/ModifiedMaterial.cs.meta

@@ -0,0 +1,11 @@
+fileFormatVersion: 2
+guid: b0beae5bb1cb142b9ab90dc0d371f026
+MonoImporter:
+  externalObjects: {}
+  serializedVersion: 2
+  defaultReferences: []
+  executionOrder: 0
+  icon: {instanceID: 0}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 

Runtime/UIParticle.cs

@@ -0,0 +1,748 @@
+using System;
+using System.Collections.Generic;
+using System.Runtime.CompilerServices;
+using Coffee.UIParticleExtensions;
+using UnityEngine;
+using UnityEngine.Rendering;
+using UnityEngine.Serialization;
+using UnityEngine.UI;
+using Random = UnityEngine.Random;
+
+[assembly: InternalsVisibleTo("Coffee.UIParticle.Editor")]
+
+namespace Coffee.UIExtensions
+{
+    /// <summary>
+    /// Render maskable and sortable particle effect ,without Camera, RenderTexture or Canvas.
+    /// </summary>
+    [ExecuteAlways]
+    [RequireComponent(typeof(RectTransform))]
+    [RequireComponent(typeof(CanvasRenderer))]
+    public class UIParticle : MaskableGraphic, ISerializationCallbackReceiver
+    {
+        public enum AutoScalingMode
+        {
+            None,
+            UIParticle,
+            Transform
+        }
+
+        public enum MeshSharing
+        {
+            None,
+            Auto,
+            Primary,
+            PrimarySimulator,
+            Replica
+        }
+
+        public enum PositionMode
+        {
+            Relative,
+            Absolute
+        }
+
+        [HideInInspector]
+        [SerializeField]
+        [Obsolete]
+        internal bool m_IsTrail;
+
+        [HideInInspector]
+        [FormerlySerializedAs("m_IgnoreParent")]
+        [SerializeField]
+        [Obsolete]
+        private bool m_IgnoreCanvasScaler;
+
+        [HideInInspector]
+        [SerializeField]
+        [Obsolete]
+        internal bool m_AbsoluteMode;
+
+        [Tooltip("Scale the rendering particles. When the `3D` toggle is enabled, 3D scale (x, y, z) is supported.")]
+        [SerializeField]
+        private Vector3 m_Scale3D = new Vector3(10, 10, 10);
+
+        [Tooltip("If you want to update material properties (e.g. _MainTex_ST, _Color) in AnimationClip, " +
+                 "use this to mark as animatable.")]
+        [SerializeField]
+        internal AnimatableProperty[] m_AnimatableProperties = new AnimatableProperty[0];
+
+        [Tooltip("Particles")]
+        [SerializeField]
+        private List<ParticleSystem> m_Particles = new List<ParticleSystem>();
+
+        [Tooltip("Particle simulation results are shared within the same group. " +
+                 "A large number of the same effects can be displayed with a small load.\n" +
+                 "None: Disable mesh sharing.\n" +
+                 "Auto: Automatically select Primary/Replica.\n" +
+                 "Primary: Provides particle simulation results to the same group.\n" +
+                 "Primary Simulator: Primary, but do not render the particle (simulation only).\n" +
+                 "Replica: Render simulation results provided by the primary.")]
+        [SerializeField]
+        private MeshSharing m_MeshSharing = MeshSharing.None;
+
+        [Tooltip("Mesh sharing group ID.\n" +
+                 "If non-zero is specified, particle simulation results are shared within the group.")]
+        [SerializeField]
+        private int m_GroupId;
+
+        [SerializeField]
+        private int m_GroupMaxId;
+
+        [Tooltip("Emission position mode.\n" +
+                 "Relative: The particles will be emitted from the scaled position.\n" +
+                 "Absolute: The particles will be emitted from the world position.")]
+        [SerializeField]
+        private PositionMode m_PositionMode = PositionMode.Relative;
+
+        [SerializeField]
+        [Obsolete]
+        internal bool m_AutoScaling;
+
+        [SerializeField]
+        [Tooltip(
+            "How to automatically adjust when the Canvas scale is changed by the screen size or reference resolution.\n" +
+            "None: Do nothing.\n" +
+            "Transform: Transform.lossyScale (=world scale) will be set to (1, 1, 1).\n" +
+            "UIParticle: UIParticle.scale will be adjusted.")]
+        private AutoScalingMode m_AutoScalingMode = AutoScalingMode.Transform;
+
+        [SerializeField]
+        [Tooltip("Use a custom view.\n" +
+                 "Use this if the particles are not displayed correctly due to min/max particle size.")]
+        private bool m_UseCustomView;
+
+        [SerializeField]
+        [Tooltip("Custom view size.\n" +
+                 "Change the bake view size.")]
+        private float m_CustomViewSize = 10;
+
+        private readonly List<UIParticleRenderer> _renderers = new List<UIParticleRenderer>();
+        private Camera _bakeCamera;
+        private Canvas _canvas;
+        private int _groupId;
+        private bool _isScaleStored;
+        private Vector3 _storedScale;
+        private DrivenRectTransformTracker _tracker;
+
+        /// <summary>
+        /// Should this graphic be considered a target for ray-casting?
+        /// </summary>
+        public override bool raycastTarget
+        {
+            get => false;
+            set { }
+        }
+
+        /// <summary>
+        /// Particle simulation results are shared within the same group.
+        /// A large number of the same effects can be displayed with a small load.
+        /// None: disable mesh sharing.
+        /// Auto: automatically select Primary/Replica.
+        /// Primary: provides particle simulation results to the same group.
+        /// Primary Simulator: Primary, but do not render the particle (simulation only).
+        /// Replica: render simulation results provided by the primary.
+        /// </summary>
+        public MeshSharing meshSharing
+        {
+            get => m_MeshSharing;
+            set => m_MeshSharing = value;
+        }
+
+        /// <summary>
+        /// Mesh sharing group ID.
+        /// If non-zero is specified, particle simulation results are shared within the group.
+        /// </summary>
+        public int groupId
+        {
+            get => _groupId;
+            set
+            {
+                if (m_GroupId == value) return;
+                m_GroupId = value;
+                if (m_GroupId != m_GroupMaxId)
+                {
+                    ResetGroupId();
+                }
+            }
+        }
+
+        public int groupMaxId
+        {
+            get => m_GroupMaxId;
+            set
+            {
+                if (m_GroupMaxId == value) return;
+                m_GroupMaxId = value;
+                ResetGroupId();
+            }
+        }
+
+        /// <summary>
+        /// Emission position mode.
+        /// Relative: The particles will be emitted from the scaled position.
+        /// Absolute: The particles will be emitted from the world position.
+        /// </summary>
+        public PositionMode positionMode
+        {
+            get => m_PositionMode;
+            set => m_PositionMode = value;
+        }
+
+        /// <summary>
+        /// Particle position mode.
+        /// Relative: The particles will be emitted from the scaled position of the ParticleSystem.
+        /// Absolute: The particles will be emitted from the world position of the ParticleSystem.
+        /// </summary>
+        [Obsolete("The absoluteMode is now obsolete. Please use the autoScalingMode instead.", false)]
+        public bool absoluteMode
+        {
+            get => m_PositionMode == PositionMode.Absolute;
+            set => positionMode = value ? PositionMode.Absolute : PositionMode.Relative;
+        }
+
+        /// <summary>
+        /// Prevents the root-Canvas scale from affecting the hierarchy-scaled ParticleSystem.
+        /// </summary>
+        [Obsolete("The autoScaling is now obsolete. Please use the autoScalingMode instead.", false)]
+        public bool autoScaling
+        {
+            get => m_AutoScalingMode != AutoScalingMode.None;
+            set => autoScalingMode = value ? AutoScalingMode.Transform : AutoScalingMode.None;
+        }
+
+        /// <summary>
+        /// How to automatically adjust when the Canvas scale is changed by the screen size or reference resolution.
+        /// <para/>
+        /// None: Do nothing.
+        /// <para/>
+        /// Transform: Transform.lossyScale (=world scale) will be set to (1, 1, 1).
+        /// <para/>
+        /// UIParticle: UIParticle.scale will be adjusted.
+        /// </summary>
+        public AutoScalingMode autoScalingMode
+        {
+            get => m_AutoScalingMode;
+            set
+            {
+                if (m_AutoScalingMode == value) return;
+                m_AutoScalingMode = value;
+
+                if (autoScalingMode != AutoScalingMode.Transform && _isScaleStored)
+                {
+                    transform.localScale = _storedScale;
+                    _isScaleStored = false;
+                }
+            }
+        }
+
+        /// <summary>
+        /// Use a custom view.
+        /// Use this if the particles are not displayed correctly due to min/max particle size.
+        /// </summary>
+        public bool useCustomView
+        {
+            get => m_UseCustomView;
+            set => m_UseCustomView = value;
+        }
+
+        /// <summary>
+        /// Custom view size.
+        /// Change the bake view size.
+        /// </summary>
+        public float customViewSize
+        {
+            get => m_CustomViewSize;
+            set => m_CustomViewSize = Mathf.Max(0.1f, value);
+        }
+
+        internal bool useMeshSharing => m_MeshSharing != MeshSharing.None;
+
+        internal bool isPrimary =>
+            m_MeshSharing == MeshSharing.Primary
+            || m_MeshSharing == MeshSharing.PrimarySimulator;
+
+        internal bool canSimulate =>
+            m_MeshSharing == MeshSharing.None
+            || m_MeshSharing == MeshSharing.Auto
+            || m_MeshSharing == MeshSharing.Primary
+            || m_MeshSharing == MeshSharing.PrimarySimulator;
+
+        internal bool canRender =>
+            m_MeshSharing == MeshSharing.None
+            || m_MeshSharing == MeshSharing.Auto
+            || m_MeshSharing == MeshSharing.Primary
+            || m_MeshSharing == MeshSharing.Replica;
+
+        /// <summary>
+        /// Particle effect scale.
+        /// </summary>
+        public float scale
+        {
+            get => m_Scale3D.x;
+            set => m_Scale3D = new Vector3(value, value, value);
+        }
+
+        /// <summary>
+        /// Particle effect scale.
+        /// </summary>
+        public Vector3 scale3D
+        {
+            get => m_Scale3D;
+            set => m_Scale3D = value;
+        }
+
+        /// <summary>
+        /// Particle effect scale.
+        /// </summary>
+        public Vector3 scale3DForCalc => autoScalingMode == AutoScalingMode.Transform
+            ? m_Scale3D
+            : m_Scale3D.GetScaled(canvasScale, transform.localScale);
+
+        public List<ParticleSystem> particles => m_Particles;
+
+        /// <summary>
+        /// Paused.
+        /// </summary>
+        public bool isPaused { get; private set; }
+
+        public Vector3 parentScale { get; private set; }
+
+        public Vector3 canvasScale { get; private set; }
+
+        protected override void OnEnable()
+        {
+            _isScaleStored = false;
+            ResetGroupId();
+            UIParticleUpdater.Register(this);
+            RegisterDirtyMaterialCallback(UpdateRendererMaterial);
+
+            if (0 < particles.Count)
+            {
+                RefreshParticles(particles);
+            }
+            else
+            {
+                RefreshParticles();
+            }
+
+            base.OnEnable();
+        }
+
+        /// <summary>
+        /// This function is called when the behaviour becomes disabled.
+        /// </summary>
+        protected override void OnDisable()
+        {
+            _tracker.Clear();
+            if (autoScalingMode == AutoScalingMode.Transform && _isScaleStored)
+            {
+                transform.localScale = _storedScale;
+            }
+
+            _isScaleStored = false;
+            UIParticleUpdater.Unregister(this);
+            _renderers.ForEach(r => r.Reset());
+            UnregisterDirtyMaterialCallback(UpdateRendererMaterial);
+
+            base.OnDisable();
+        }
+
+        /// <summary>
+        /// Callback for when properties have been changed by animation.
+        /// </summary>
+        protected override void OnDidApplyAnimationProperties()
+        {
+        }
+
+        /// <summary>
+        /// This function is called when a direct or indirect parent of the transform of the GameObject has changed.
+        /// </summary>
+        protected override void OnTransformParentChanged()
+        {
+        }
+
+        void ISerializationCallbackReceiver.OnBeforeSerialize()
+        {
+        }
+
+        void ISerializationCallbackReceiver.OnAfterDeserialize()
+        {
+#pragma warning disable CS0612 // Type or member is obsolete
+            if (m_IgnoreCanvasScaler || m_AutoScaling)
+            {
+                m_IgnoreCanvasScaler = false;
+                m_AutoScaling = false;
+                m_AutoScalingMode = AutoScalingMode.Transform;
+            }
+
+            if (m_AbsoluteMode)
+            {
+                m_AbsoluteMode = false;
+                m_PositionMode = PositionMode.Absolute;
+            }
+#pragma warning restore CS0612 // Type or member is obsolete
+        }
+
+        /// <summary>
+        /// Play the ParticleSystems.
+        /// </summary>
+        public void Play()
+        {
+            particles.Exec(p => p.Simulate(0, false, true));
+            isPaused = false;
+        }
+
+        /// <summary>
+        /// Pause the ParticleSystems.
+        /// </summary>
+        public void Pause()
+        {
+            particles.Exec(p => p.Pause());
+            isPaused = true;
+        }
+
+        /// <summary>
+        /// Unpause the ParticleSystems.
+        /// </summary>
+        public void Resume()
+        {
+            isPaused = false;
+        }
+
+        /// <summary>
+        /// Stop the ParticleSystems.
+        /// </summary>
+        public void Stop()
+        {
+            particles.Exec(p => p.Stop());
+            isPaused = true;
+        }
+
+        /// <summary>
+        /// Start emission of the ParticleSystems.
+        /// </summary>
+        public void StartEmission()
+        {
+            particles.Exec(p =>
+            {
+                var emission = p.emission;
+                emission.enabled = true;
+            });
+        }
+
+        /// <summary>
+        /// Stop emission of the ParticleSystems.
+        /// </summary>
+        public void StopEmission()
+        {
+            particles.Exec(p =>
+            {
+                var emission = p.emission;
+                emission.enabled = false;
+            });
+        }
+
+        /// <summary>
+        /// Clear the particles of the ParticleSystems.
+        /// </summary>
+        public void Clear()
+        {
+            particles.Exec(p => p.Clear());
+            isPaused = true;
+        }
+
+        /// <summary>
+        /// Get all base materials to render.
+        /// </summary>
+        public void GetMaterials(List<Material> result)
+        {
+            if (result == null) return;
+
+            for (var i = 0; i < _renderers.Count; i++)
+            {
+                var r = _renderers[i];
+                if (!r || !r.material) continue;
+                result.Add(r.material);
+            }
+        }
+
+        /// <summary>
+        /// Refresh UIParticle using the ParticleSystem instance.
+        /// </summary>
+        public void SetParticleSystemInstance(GameObject instance)
+        {
+            SetParticleSystemInstance(instance, true);
+        }
+
+        /// <summary>
+        /// Refresh UIParticle using the ParticleSystem instance.
+        /// </summary>
+        public void SetParticleSystemInstance(GameObject instance, bool destroyOldParticles)
+        {
+            if (!instance) return;
+
+            var childCount = transform.childCount;
+            for (var i = 0; i < childCount; i++)
+            {
+                var go = transform.GetChild(i).gameObject;
+                if (go.TryGetComponent<Camera>(out var cam) && cam == _bakeCamera) continue;
+                if (go.TryGetComponent<UIParticleRenderer>(out var _)) continue;
+
+                go.SetActive(false);
+                if (destroyOldParticles)
+                {
+                    Misc.Destroy(go);
+                }
+            }
+
+            var tr = instance.transform;
+            tr.SetParent(transform, false);
+            tr.localPosition = Vector3.zero;
+
+            RefreshParticles(instance);
+        }
+
+        /// <summary>
+        /// Refresh UIParticle using the prefab.
+        /// The prefab is automatically instantiated.
+        /// </summary>
+        public void SetParticleSystemPrefab(GameObject prefab)
+        {
+            if (!prefab) return;
+
+            SetParticleSystemInstance(Instantiate(prefab.gameObject), true);
+        }
+
+        /// <summary>
+        /// Refresh UIParticle.
+        /// Collect ParticleSystems under the GameObject and refresh the UIParticle.
+        /// </summary>
+        public void RefreshParticles()
+        {
+            RefreshParticles(gameObject);
+        }
+
+        /// <summary>
+        /// Refresh UIParticle.
+        /// Collect ParticleSystems under the GameObject and refresh the UIParticle.
+        /// </summary>
+        private void RefreshParticles(GameObject root)
+        {
+            if (!root) return;
+            root.GetComponentsInChildren(true, particles);
+            for (var i = particles.Count - 1; 0 <= i; i--)
+            {
+                var ps = particles[i];
+                if (!ps || ps.GetComponentInParent<UIParticle>(true) != this)
+                {
+                    particles.RemoveAt(i);
+                }
+            }
+
+            for (var i = 0; i < particles.Count; i++)
+            {
+                var ps = particles[i];
+                var tsa = ps.textureSheetAnimation;
+                if (tsa.mode == ParticleSystemAnimationMode.Sprites && tsa.uvChannelMask == 0)
+                {
+                    tsa.uvChannelMask = UVChannelFlags.UV0;
+                }
+            }
+
+            RefreshParticles(particles);
+        }
+
+        /// <summary>
+        /// Refresh UIParticle using a list of ParticleSystems.
+        /// </summary>
+        public void RefreshParticles(List<ParticleSystem> particleSystems)
+        {
+            // Collect children UIParticleRenderer components.
+            // #246: Nullptr exceptions when using nested UIParticle components in hierarchy
+            _renderers.Clear();
+            var childCount = transform.childCount;
+            for (var i = 0; i < childCount; i++)
+            {
+                var child = transform.GetChild(i);
+                if (child.TryGetComponent(out UIParticleRenderer uiParticleRenderer))
+                {
+                    _renderers.Add(uiParticleRenderer);
+                }
+            }
+
+            // Reset the UIParticleRenderer components.
+            for (var i = 0; i < _renderers.Count; i++)
+            {
+                _renderers[i].Reset(i);
+            }
+
+            // Set the ParticleSystem to the UIParticleRenderer. If the trail is enabled, set it additionally.
+            var j = 0;
+            for (var i = 0; i < particleSystems.Count; i++)
+            {
+                var ps = particleSystems[i];
+                if (!ps) continue;
+                GetRenderer(j++).Set(this, ps, false);
+
+                // If the trail is enabled, set it additionally.
+                if (ps.trails.enabled)
+                {
+                    GetRenderer(j++).Set(this, ps, true);
+                }
+            }
+        }
+
+        internal void UpdateTransformScale()
+        {
+            _tracker.Clear();
+            canvasScale = canvas.rootCanvas.transform.localScale.Inverse();
+            parentScale = transform.parent.lossyScale;
+            if (autoScalingMode != AutoScalingMode.Transform)
+            {
+                if (_isScaleStored)
+                {
+                    transform.localScale = _storedScale;
+                }
+
+                _isScaleStored = false;
+                return;
+            }
+
+            var currentScale = transform.localScale;
+            if (!_isScaleStored)
+            {
+                _storedScale = currentScale.IsVisible() ? currentScale : Vector3.one;
+                _isScaleStored = true;
+            }
+
+            _tracker.Add(this, rectTransform, DrivenTransformProperties.Scale);
+            var newScale = parentScale.Inverse();
+            if (currentScale != newScale)
+            {
+                transform.localScale = newScale;
+            }
+        }
+
+        internal void UpdateRenderers()
+        {
+            if (!isActiveAndEnabled) return;
+
+            for (var i = 0; i < _renderers.Count; i++)
+            {
+                var r = _renderers[i];
+                if (r) continue;
+
+                RefreshParticles(particles);
+                break;
+            }
+
+            var bakeCamera = GetBakeCamera();
+            for (var i = 0; i < _renderers.Count; i++)
+            {
+                var r = _renderers[i];
+                if (!r) continue;
+
+                r.UpdateMesh(bakeCamera);
+            }
+        }
+
+        internal void ResetGroupId()
+        {
+            _groupId = m_GroupId == m_GroupMaxId
+                ? m_GroupId
+                : Random.Range(m_GroupId, m_GroupMaxId + 1);
+        }
+
+        protected override void UpdateMaterial()
+        {
+        }
+
+        /// <summary>
+        /// Call to update the geometry of the Graphic onto the CanvasRenderer.
+        /// </summary>
+        protected override void UpdateGeometry()
+        {
+        }
+
+        private void UpdateRendererMaterial()
+        {
+            for (var i = 0; i < _renderers.Count; i++)
+            {
+                var r = _renderers[i];
+                if (!r) continue;
+                r.maskable = maskable;
+                r.SetMaterialDirty();
+            }
+        }
+
+        internal UIParticleRenderer GetRenderer(int index)
+        {
+            if (_renderers.Count <= index)
+            {
+                _renderers.Add(UIParticleRenderer.AddRenderer(this, index));
+            }
+
+            if (!_renderers[index])
+            {
+                _renderers[index] = UIParticleRenderer.AddRenderer(this, index);
+            }
+
+            return _renderers[index];
+        }
+
+        private Camera GetBakeCamera()
+        {
+            if (!canvas) return Camera.main;
+            if (!useCustomView && canvas.renderMode != RenderMode.ScreenSpaceOverlay && canvas.rootCanvas.worldCamera)
+            {
+                return canvas.rootCanvas.worldCamera;
+            }
+
+            if (_bakeCamera)
+            {
+                _bakeCamera.orthographicSize = useCustomView ? customViewSize : 10;
+                return _bakeCamera;
+            }
+
+            // Find existing baking camera.
+            var childCount = transform.childCount;
+            for (var i = 0; i < childCount; i++)
+            {
+                if (transform.GetChild(i).TryGetComponent<Camera>(out var cam)
+                    && cam.name == "[generated] UIParticle BakingCamera")
+                {
+                    _bakeCamera = cam;
+                    break;
+                }
+            }
+
+            // Create baking camera.
+            if (!_bakeCamera)
+            {
+                var go = new GameObject("[generated] UIParticle BakingCamera");
+                go.SetActive(false);
+                go.transform.SetParent(transform, false);
+                _bakeCamera = go.AddComponent<Camera>();
+            }
+
+            // Setup baking camera.
+            _bakeCamera.enabled = false;
+            _bakeCamera.orthographicSize = useCustomView ? customViewSize : 10;
+            _bakeCamera.transform.SetPositionAndRotation(new Vector3(0, 0, -1000), Quaternion.identity);
+            _bakeCamera.orthographic = true;
+            _bakeCamera.farClipPlane = 2000f;
+            _bakeCamera.clearFlags = CameraClearFlags.Nothing;
+            _bakeCamera.cullingMask = 0; // Nothing
+            _bakeCamera.allowHDR = false;
+            _bakeCamera.allowMSAA = false;
+            _bakeCamera.renderingPath = RenderingPath.Forward;
+            _bakeCamera.useOcclusionCulling = false;
+
+            _bakeCamera.gameObject.SetActive(false);
+            _bakeCamera.gameObject.hideFlags = HideFlags.HideAndDontSave;
+
+            return _bakeCamera;
+        }
+    }
+}

Runtime/UIParticle.cs.meta

@@ -0,0 +1,11 @@
+fileFormatVersion: 2
+guid: 16f0b0b6d0b7542bfbd20a3e05b04ff1
+MonoImporter:
+  externalObjects: {}
+  serializedVersion: 2
+  defaultReferences: []
+  executionOrder: 0
+  icon: {fileID: 2800000, guid: 5f0675613942149309588d556e33d990, type: 3}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 

Runtime/UIParticleAttractor.cs

@@ -0,0 +1,262 @@
+using System;
+using Coffee.UIParticleExtensions;
+using UnityEngine;
+using UnityEngine.Events;
+
+namespace Coffee.UIExtensions
+{
+    [ExecuteAlways]
+    public class UIParticleAttractor : MonoBehaviour
+    {
+        public enum Movement
+        {
+            Linear,
+            Smooth,
+            Sphere
+        }
+
+        public enum UpdateMode
+        {
+            Normal,
+            UnscaledTime
+        }
+
+        [SerializeField]
+        private ParticleSystem m_ParticleSystem;
+
+        [Range(0.1f, 10f)]
+        [SerializeField]
+        private float m_DestinationRadius = 1;
+
+        [Range(0f, 0.95f)]
+        [SerializeField]
+        private float m_DelayRate;
+
+        [Range(0.001f, 100f)]
+        [SerializeField]
+        private float m_MaxSpeed = 1;
+
+        [SerializeField]
+        private Movement m_Movement;
+
+        [SerializeField]
+        private UpdateMode m_UpdateMode;
+
+        [SerializeField]
+        private UnityEvent m_OnAttracted;
+
+        private UIParticle _uiParticle;
+
+        public float destinationRadius
+        {
+            get => m_DestinationRadius;
+            set => m_DestinationRadius = Mathf.Clamp(value, 0.1f, 10f);
+        }
+
+        public float delay
+        {
+            get => m_DelayRate;
+            set => m_DelayRate = value;
+        }
+
+        public float maxSpeed
+        {
+            get => m_MaxSpeed;
+            set => m_MaxSpeed = value;
+        }
+
+        public Movement movement
+        {
+            get => m_Movement;
+            set => m_Movement = value;
+        }
+
+        public UpdateMode updateMode
+        {
+            get => m_UpdateMode;
+            set => m_UpdateMode = value;
+        }
+
+        public UnityEvent onAttracted
+        {
+            get => m_OnAttracted;
+            set => m_OnAttracted = value;
+        }
+
+        /// <summary>
+        /// The target ParticleSystem to attract.
+        /// </summary>
+#if UNITY_EDITOR
+        public new ParticleSystem particleSystem
+#else
+        public ParticleSystem particleSystem
+#endif
+        {
+            get => m_ParticleSystem;
+            set
+            {
+                m_ParticleSystem = value;
+                ApplyParticleSystem();
+            }
+        }
+
+        private void OnEnable()
+        {
+            ApplyParticleSystem();
+            UIParticleUpdater.Register(this);
+        }
+
+        private void OnDisable()
+        {
+            UIParticleUpdater.Unregister(this);
+        }
+
+        private void OnDestroy()
+        {
+            _uiParticle = null;
+            m_ParticleSystem = null;
+        }
+
+        internal void Attract()
+        {
+            if (m_ParticleSystem == null) return;
+
+            var count = m_ParticleSystem.particleCount;
+            if (count == 0) return;
+
+            var particles = ParticleSystemExtensions.GetParticleArray(count);
+            m_ParticleSystem.GetParticles(particles, count);
+
+            var dstPos = GetDestinationPosition();
+            for (var i = 0; i < count; i++)
+            {
+                // Attracted
+                var p = particles[i];
+                if (0f < p.remainingLifetime && Vector3.Distance(p.position, dstPos) < m_DestinationRadius)
+                {
+                    p.remainingLifetime = 0f;
+                    particles[i] = p;
+
+                    if (m_OnAttracted != null)
+                    {
+                        try
+                        {
+                            m_OnAttracted.Invoke();
+                        }
+                        catch (Exception e)
+                        {
+                            Debug.LogException(e);
+                        }
+                    }
+
+                    continue;
+                }
+
+                // Calc attracting time
+                var delayTime = p.startLifetime * m_DelayRate;
+                var duration = p.startLifetime - delayTime;
+                var time = Mathf.Max(0, p.startLifetime - p.remainingLifetime - delayTime);
+
+                // Delay
+                if (time <= 0) continue;
+
+                // Attract
+                p.position = GetAttractedPosition(p.position, dstPos, duration, time);
+                p.velocity *= 0.5f;
+                particles[i] = p;
+            }
+
+            m_ParticleSystem.SetParticles(particles, count);
+        }
+
+        private Vector3 GetDestinationPosition()
+        {
+            var isUI = _uiParticle && _uiParticle.enabled;
+            var psPos = m_ParticleSystem.transform.position;
+            var attractorPos = transform.position;
+            var dstPos = attractorPos;
+            var isLocalSpace = m_ParticleSystem.IsLocalSpace();
+
+            if (isLocalSpace)
+            {
+                dstPos = m_ParticleSystem.transform.InverseTransformPoint(dstPos);
+            }
+
+            if (isUI)
+            {
+                var inverseScale = _uiParticle.parentScale.Inverse();
+                var scale3d = _uiParticle.scale3DForCalc;
+                dstPos = dstPos.GetScaled(inverseScale, scale3d.Inverse());
+
+                // Relative mode
+                if (_uiParticle.positionMode == UIParticle.PositionMode.Relative)
+                {
+                    var diff = _uiParticle.transform.position - psPos;
+                    diff.Scale(scale3d - inverseScale);
+                    diff.Scale(scale3d.Inverse());
+                    dstPos += diff;
+                }
+
+#if UNITY_EDITOR
+                if (!Application.isPlaying && !isLocalSpace)
+                {
+                    dstPos += psPos - psPos.GetScaled(inverseScale, scale3d.Inverse());
+                }
+#endif
+            }
+
+            return dstPos;
+        }
+
+        private Vector3 GetAttractedPosition(Vector3 current, Vector3 target, float duration, float time)
+        {
+            var speed = m_MaxSpeed;
+            switch (m_UpdateMode)
+            {
+                case UpdateMode.Normal:
+                    speed *= 60 * Time.deltaTime;
+                    break;
+                case UpdateMode.UnscaledTime:
+                    speed *= 60 * Time.unscaledDeltaTime;
+                    break;
+            }
+
+            switch (m_Movement)
+            {
+                case Movement.Linear:
+                    speed /= duration;
+                    break;
+                case Movement.Smooth:
+                    target = Vector3.Lerp(current, target, time / duration);
+                    break;
+                case Movement.Sphere:
+                    target = Vector3.Slerp(current, target, time / duration);
+                    break;
+            }
+
+            return Vector3.MoveTowards(current, target, speed);
+        }
+
+        private void ApplyParticleSystem()
+        {
+            _uiParticle = null;
+            if (m_ParticleSystem == null)
+            {
+#if UNITY_EDITOR
+                if (Application.isPlaying)
+#endif
+                {
+                    Debug.LogError("No particle system attached to particle attractor script", this);
+                }
+
+                return;
+            }
+
+            _uiParticle = m_ParticleSystem.GetComponentInParent<UIParticle>(true);
+            if (_uiParticle && !_uiParticle.particles.Contains(m_ParticleSystem))
+            {
+                _uiParticle = null;
+            }
+        }
+    }
+}

Runtime/UIParticleAttractor.cs.meta

@@ -0,0 +1,11 @@
+fileFormatVersion: 2
+guid: 00e55ae1441ff4583859c55384964d86
+MonoImporter:
+  externalObjects: {}
+  serializedVersion: 2
+  defaultReferences: []
+  executionOrder: 0
+  icon: {instanceID: 0}
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+  assetBundleVariant: 

Runtime/UIParticleRenderer.cs

@@ -0,0 +1,715 @@
+#if UNITY_2022_3_0 || UNITY_2022_3_1 || UNITY_2022_3_2 || UNITY_2022_3_3 || UNITY_2022_3_4 || UNITY_2022_3_5 || UNITY_2022_3_6 || UNITY_2022_3_7 || UNITY_2022_3_8 || UNITY_2022_3_9 || UNITY_2022_3_10
+#elif UNITY_2023_1_0 || UNITY_2023_1_1 || UNITY_2023_1_2 || UNITY_2023_1_3 || UNITY_2023_1_4 || UNITY_2023_1_5 || UNITY_2023_1_6 || UNITY_2023_1_7 || UNITY_2023_1_8 || UNITY_2023_1_9
+#elif UNITY_2023_1_10 || UNITY_2023_1_11 || UNITY_2023_1_12 || UNITY_2023_1_13 || UNITY_2023_1_14 || UNITY_2023_1_15 || UNITY_2023_1_16
+#elif UNITY_2022_3_OR_NEWER
+#define PS_BAKE_API_V2
+#endif
+using System;
+using System.Collections.Generic;
+using Coffee.UIParticleExtensions;
+using UnityEditor;
+using UnityEngine;
+using UnityEngine.Profiling;
+using UnityEngine.Rendering;
+using UnityEngine.UI;
+
+namespace Coffee.UIExtensions
+{
+    [ExecuteAlways]
+    [RequireComponent(typeof(RectTransform))]
+    [RequireComponent(typeof(CanvasRenderer))]
+    [AddComponentMenu("")]
+    internal class UIParticleRenderer : MaskableGraphic
+    {
+        private static readonly List<Component> s_Components = new List<Component>();
+        private static readonly CombineInstance[] s_CombineInstances = { new CombineInstance() };
+        private static readonly List<Material> s_Materials = new List<Material>(2);
+        private static MaterialPropertyBlock s_Mpb;
+        private static readonly List<UIParticleRenderer> s_Renderers = new List<UIParticleRenderer>();
+        private static readonly List<Color32> s_Colors = new List<Color32>();
+        private static readonly Vector3[] s_Corners = new Vector3[4];
+        private Material _currentMaterialForRendering;
+        private bool _delay;
+        private int _index;
+        private bool _isPrevStored;
+        private bool _isTrail;
+        private Bounds _lastBounds;
+        private Material _modifiedMaterial;
+        private UIParticle _parent;
+        private ParticleSystem _particleSystem;
+        private float _prevCanvasScale;
+        private Vector3 _prevPsPos;
+        private Vector3 _prevScale;
+        private Vector2Int _prevScreenSize;
+        private bool _preWarm;
+        private ParticleSystemRenderer _renderer;
+
+        public override Texture mainTexture => _isTrail ? null : _particleSystem.GetTextureForSprite();
+
+        public override bool raycastTarget => false;
+
+        private Rect rootCanvasRect
+        {
+            get
+            {
+                s_Corners[0] = transform.TransformPoint(_lastBounds.min.x, _lastBounds.min.y, 0);
+                s_Corners[1] = transform.TransformPoint(_lastBounds.min.x, _lastBounds.max.y, 0);
+                s_Corners[2] = transform.TransformPoint(_lastBounds.max.x, _lastBounds.max.y, 0);
+                s_Corners[3] = transform.TransformPoint(_lastBounds.max.x, _lastBounds.min.y, 0);
+                if (canvas)
+                {
+                    var worldToLocalMatrix = canvas.rootCanvas.transform.worldToLocalMatrix;
+                    for (var i = 0; i < 4; ++i)
+                    {
+                        s_Corners[i] = worldToLocalMatrix.MultiplyPoint(s_Corners[i]);
+                    }
+                }
+
+                var corner1 = (Vector2)s_Corners[0];
+                var corner2 = (Vector2)s_Corners[0];
+                for (var i = 1; i < 4; ++i)
+                {
+                    if (s_Corners[i].x < corner1.x)
+                    {
+                        corner1.x = s_Corners[i].x;
+                    }
+                    else if (s_Corners[i].x > corner2.x)
+                    {
+                        corner2.x = s_Corners[i].x;
+                    }
+
+                    if (s_Corners[i].y < corner1.y)
+                    {
+                        corner1.y = s_Corners[i].y;
+                    }
+                    else if (s_Corners[i].y > corner2.y)
+                    {
+                        corner2.y = s_Corners[i].y;
+                    }
+                }
+
+                return new Rect(corner1, corner2 - corner1);
+            }
+        }
+
+        public void Reset(int index = -1)
+        {
+            if (_renderer)
+            {
+                _renderer.enabled = true;
+            }
+
+            _parent = null;
+            _particleSystem = null;
+            _renderer = null;
+            if (0 <= index)
+            {
+                _index = index;
+            }
+
+            //_emitter = null;
+            if (this && isActiveAndEnabled)
+            {
+                material = null;
+                canvasRenderer.Clear();
+                _lastBounds = new Bounds();
+                enabled = false;
+            }
+            else
+            {
+                ModifiedMaterial.Remove(_modifiedMaterial);
+                _modifiedMaterial = null;
+                _currentMaterialForRendering = null;
+            }
+        }
+
+        protected override void OnEnable()
+        {
+            base.OnEnable();
+
+            if (!s_CombineInstances[0].mesh)
+            {
+                s_CombineInstances[0].mesh = new Mesh
+                {
+                    name = "[UIParticleRenderer] Combine Instance Mesh",
+                    hideFlags = HideFlags.HideAndDontSave
+                };
+            }
+
+            _currentMaterialForRendering = null;
+        }
+
+        protected override void OnDisable()
+        {
+            base.OnDisable();
+
+            ModifiedMaterial.Remove(_modifiedMaterial);
+            _modifiedMaterial = null;
+            _currentMaterialForRendering = null;
+            _isPrevStored = false;
+        }
+
+        public static UIParticleRenderer AddRenderer(UIParticle parent, int index)
+        {
+            // Create renderer object.
+            var go = new GameObject("[generated] UIParticleRenderer", typeof(UIParticleRenderer))
+            {
+                hideFlags = HideFlags.HideAndDontSave,
+                layer = parent.gameObject.layer
+            };
+
+            // Set parent.
+            var transform = go.transform;
+            transform.SetParent(parent.transform, false);
+            transform.localPosition = Vector3.zero;
+            transform.localRotation = Quaternion.identity;
+            transform.localScale = Vector3.one;
+
+            // Add renderer component.
+            var renderer = go.GetComponent<UIParticleRenderer>();
+            renderer._parent = parent;
+            renderer._index = index;
+
+            return renderer;
+        }
+
+        /// <summary>
+        /// Perform material modification in this function.
+        /// </summary>
+        public override Material GetModifiedMaterial(Material baseMaterial)
+        {
+            _currentMaterialForRendering = null;
+
+            if (!IsActive() || !_parent)
+            {
+                ModifiedMaterial.Remove(_modifiedMaterial);
+                _modifiedMaterial = null;
+                return baseMaterial;
+            }
+
+            var modifiedMaterial = base.GetModifiedMaterial(baseMaterial);
+
+            //
+            var texture = mainTexture;
+            if (texture == null && _parent.m_AnimatableProperties.Length == 0)
+            {
+                ModifiedMaterial.Remove(_modifiedMaterial);
+                _modifiedMaterial = null;
+                return modifiedMaterial;
+            }
+
+            //
+            var id = _parent.m_AnimatableProperties.Length == 0 ? 0 : GetInstanceID();
+#if UNITY_EDITOR
+            var props = EditorJsonUtility.ToJson(modifiedMaterial).GetHashCode();
+#else
+            var props = 0;
+#endif
+            modifiedMaterial = ModifiedMaterial.Add(modifiedMaterial, texture, id, props);
+            ModifiedMaterial.Remove(_modifiedMaterial);
+            _modifiedMaterial = modifiedMaterial;
+
+            return modifiedMaterial;
+        }
+
+        public void Set(UIParticle parent, ParticleSystem ps, bool isTrail)
+        {
+            _parent = parent;
+            maskable = parent.maskable;
+
+            gameObject.layer = parent.gameObject.layer;
+
+            _particleSystem = ps;
+            _preWarm = _particleSystem.main.prewarm;
+
+#if UNITY_EDITOR
+            if (Application.isPlaying)
+#endif
+            {
+                if (_particleSystem.isPlaying || _preWarm)
+                {
+                    _particleSystem.Clear();
+                    _particleSystem.Pause();
+                }
+            }
+
+            ps.TryGetComponent(out _renderer);
+            _renderer.enabled = false;
+
+            //_emitter = emitter;
+            _isTrail = isTrail;
+
+            _renderer.GetSharedMaterials(s_Materials);
+            material = s_Materials[isTrail ? 1 : 0];
+            s_Materials.Clear();
+
+            // Support sprite.
+            var tsa = ps.textureSheetAnimation;
+            if (tsa.mode == ParticleSystemAnimationMode.Sprites && tsa.uvChannelMask == 0)
+            {
+                tsa.uvChannelMask = UVChannelFlags.UV0;
+            }
+
+            _prevScale = GetWorldScale();
+            _prevPsPos = _particleSystem.transform.position;
+            _prevScreenSize = new Vector2Int(Screen.width, Screen.height);
+            _prevCanvasScale = canvas ? canvas.scaleFactor : 1f;
+            _delay = true;
+
+            canvasRenderer.SetTexture(null);
+
+            enabled = true;
+        }
+
+        public void UpdateMesh(Camera bakeCamera)
+        {
+            // No particle to render: Clear mesh.
+            if (
+                !isActiveAndEnabled || !_particleSystem || !_parent
+                || !canvasRenderer || !canvas || !bakeCamera
+                || _parent.meshSharing == UIParticle.MeshSharing.Replica
+                || !transform.lossyScale.GetScaled(_parent.scale3DForCalc).IsVisible() // Scale is not visible.
+                || (!_particleSystem.IsAlive() && !_particleSystem.isPlaying) // No particle.
+                || (_isTrail && !_particleSystem.trails.enabled) // Trail, but it is not enabled.
+#if UNITY_2018_3_OR_NEWER
+                || canvasRenderer.GetInheritedAlpha() <
+                0.01f // #102: Do not bake particle system to mesh when the alpha is zero.
+#endif
+            )
+            {
+                Profiler.BeginSample("[UIParticleRenderer] Clear Mesh");
+                workerMesh.Clear();
+                canvasRenderer.SetMesh(workerMesh);
+                _lastBounds = new Bounds();
+                Profiler.EndSample();
+
+                return;
+            }
+
+            var main = _particleSystem.main;
+            var scale = GetWorldScale();
+            var psPos = _particleSystem.transform.position;
+
+            // Simulate particles.
+            Profiler.BeginSample("[UIParticle] Bake Mesh > Simulate Particles");
+            if (!_isTrail && _parent.canSimulate)
+            {
+#if UNITY_EDITOR
+                if (!Application.isPlaying)
+                {
+                    SimulateForEditor(psPos - _prevPsPos, scale);
+                }
+                else
+#endif
+                {
+                    ResolveResolutionChange(psPos, scale);
+                    Simulate(scale, _parent.isPaused || _delay);
+
+                    if (_delay && !_parent.isPaused)
+                    {
+                        Simulate(scale, _parent.isPaused);
+                    }
+
+                    // When the ParticleSystem simulation is complete, stop it.
+                    if (!main.loop
+                        && main.duration <= _particleSystem.time
+                        && (_particleSystem.IsAlive() || _particleSystem.particleCount == 0)
+                       )
+                    {
+                        _particleSystem.Stop(false);
+                    }
+                }
+
+                _prevScale = scale;
+                _prevPsPos = psPos;
+                _delay = false;
+            }
+
+            Profiler.EndSample();
+
+            // Bake mesh.
+            Profiler.BeginSample("[UIParticleRenderer] Bake Mesh");
+            s_CombineInstances[0].mesh.Clear(false);
+
+            // Assertion failed on expression: 'ps->array_size()' #278
+            var extends = s_CombineInstances[0].mesh.bounds.extents.x;
+            if (!float.IsNaN(extends) && !float.IsInfinity(extends) && 0 < extends)
+            {
+                s_CombineInstances[0].mesh.RecalculateBounds();
+            }
+
+            if (_isTrail && _parent.canSimulate && 0 < _particleSystem.particleCount)
+            {
+#if PS_BAKE_API_V2
+                _renderer.BakeTrailsMesh(s_CombineInstances[0].mesh, bakeCamera,
+                    ParticleSystemBakeMeshOptions.BakeRotationAndScale);
+#else
+                _renderer.BakeTrailsMesh(s_CombineInstances[0].mesh, bakeCamera, true);
+#endif
+            }
+            else if (!_isTrail && _renderer.CanBakeMesh())
+            {
+                _particleSystem.ValidateShape();
+#if PS_BAKE_API_V2
+                _renderer.BakeMesh(s_CombineInstances[0].mesh, bakeCamera,
+                    ParticleSystemBakeMeshOptions.BakeRotationAndScale);
+#else
+                _renderer.BakeMesh(s_CombineInstances[0].mesh, bakeCamera, true);
+#endif
+            }
+
+            // Too many vertices to render.
+            if (65535 <= s_CombineInstances[0].mesh.vertexCount)
+            {
+                Debug.LogErrorFormat(this,
+                    "Too many vertices to render. index={0}, isTrail={1}, vertexCount={2}(>=65535)",
+                    _index,
+                    _isTrail,
+                    s_CombineInstances[0].mesh.vertexCount
+                );
+                s_CombineInstances[0].mesh.Clear(false);
+            }
+
+            Profiler.EndSample();
+
+            // Combine mesh to transform. ([ParticleSystem local ->] world -> renderer local)
+            Profiler.BeginSample("[UIParticleRenderer] Combine Mesh");
+            if (_parent.canSimulate)
+            {
+                if (_parent.positionMode == UIParticle.PositionMode.Absolute)
+                {
+                    s_CombineInstances[0].transform =
+                        canvasRenderer.transform.worldToLocalMatrix
+                        * GetWorldMatrix(psPos, scale);
+                }
+                else
+                {
+                    var diff = _particleSystem.transform.position - _parent.transform.position;
+                    s_CombineInstances[0].transform =
+                        canvasRenderer.transform.worldToLocalMatrix
+                        * Matrix4x4.Translate(diff.GetScaled(scale - Vector3.one))
+                        * GetWorldMatrix(psPos, scale);
+                }
+
+                workerMesh.CombineMeshes(s_CombineInstances, true, true);
+
+                workerMesh.RecalculateBounds();
+                var bounds = workerMesh.bounds;
+                var center = bounds.center;
+                center.z = 0;
+                bounds.center = center;
+                var extents = bounds.extents;
+                extents.z = 0;
+                bounds.extents = extents;
+                workerMesh.bounds = bounds;
+                _lastBounds = bounds;
+
+                // Convert linear color to gamma color.
+                if (QualitySettings.activeColorSpace == ColorSpace.Linear)
+                {
+                    Profiler.BeginSample("[UIParticleRenderer] Convert Linear to Gamma");
+                    workerMesh.GetColors(s_Colors);
+                    var count_c = s_Colors.Count;
+                    for (var i = 0; i < count_c; i++)
+                    {
+                        var c = s_Colors[i];
+                        c.r = c.r.LinearToGamma();
+                        c.g = c.g.LinearToGamma();
+                        c.b = c.b.LinearToGamma();
+                        s_Colors[i] = c;
+                    }
+
+                    workerMesh.SetColors(s_Colors);
+                    Profiler.EndSample();
+                }
+
+                GetComponents(typeof(IMeshModifier), s_Components);
+                for (var i = 0; i < s_Components.Count; i++)
+                {
+#pragma warning disable CS0618 // Type or member is obsolete
+                    ((IMeshModifier)s_Components[i]).ModifyMesh(workerMesh);
+#pragma warning restore CS0618 // Type or member is obsolete
+                }
+
+                s_Components.Clear();
+            }
+
+            Profiler.EndSample();
+
+
+            // Get grouped renderers.
+            s_Renderers.Clear();
+            if (_parent.useMeshSharing)
+            {
+                UIParticleUpdater.GetGroupedRenderers(_parent.groupId, _index, s_Renderers);
+            }
+
+            // Set mesh to the CanvasRenderer.
+            Profiler.BeginSample("[UIParticleRenderer] Set Mesh");
+            for (var i = 0; i < s_Renderers.Count; i++)
+            {
+                if (s_Renderers[i] == this) continue;
+                s_Renderers[i].canvasRenderer.SetMesh(workerMesh);
+                s_Renderers[i]._lastBounds = _lastBounds;
+            }
+
+            if (!_parent.canRender)
+            {
+                workerMesh.Clear();
+            }
+
+            canvasRenderer.SetMesh(workerMesh);
+            Profiler.EndSample();
+
+            // Update animatable material properties.
+            Profiler.BeginSample("[UIParticleRenderer] Update Animatable Material Properties");
+
+#if UNITY_EDITOR
+            if (_modifiedMaterial != material)
+            {
+                _renderer.GetSharedMaterials(s_Materials);
+                material = s_Materials[_isTrail ? 1 : 0];
+                s_Materials.Clear();
+                SetMaterialDirty();
+            }
+#endif
+
+            UpdateMaterialProperties();
+            if (_parent.useMeshSharing)
+            {
+                if (!_currentMaterialForRendering)
+                {
+                    _currentMaterialForRendering = materialForRendering;
+                }
+
+                for (var i = 0; i < s_Renderers.Count; i++)
+                {
+                    if (s_Renderers[i] == this) continue;
+
+                    s_Renderers[i].canvasRenderer.materialCount = 1;
+                    s_Renderers[i].canvasRenderer.SetMaterial(_currentMaterialForRendering, 0);
+                }
+            }
+
+            Profiler.EndSample();
+
+            s_Renderers.Clear();
+        }
+
+        /// <summary>
+        /// Call to update the geometry of the Graphic onto the CanvasRenderer.
+        /// </summary>
+        protected override void UpdateGeometry()
+        {
+        }
+
+        public override void Cull(Rect clipRect, bool validRect)
+        {
+            var cull = _lastBounds.extents == Vector3.zero
+                       || !validRect
+                       || !clipRect.Overlaps(rootCanvasRect, true);
+            if (canvasRenderer.cull == cull) return;
+
+            canvasRenderer.cull = cull;
+            UISystemProfilerApi.AddMarker("MaskableGraphic.cullingChanged", this);
+            onCullStateChanged.Invoke(cull);
+            OnCullingChanged();
+        }
+
+        private Vector3 GetWorldScale()
+        {
+            Profiler.BeginSample("[UIParticleRenderer] GetWorldScale");
+            var scale = _parent.scale3DForCalc.GetScaled(_parent.parentScale);
+
+            if (_parent.autoScalingMode == UIParticle.AutoScalingMode.UIParticle
+                && _particleSystem.main.scalingMode == ParticleSystemScalingMode.Local
+                && _parent.canvas)
+            {
+                scale = scale.GetScaled(_parent.canvas.rootCanvas.transform.localScale);
+            }
+
+            Profiler.EndSample();
+            return scale;
+        }
+
+        private Matrix4x4 GetWorldMatrix(Vector3 psPos, Vector3 scale)
+        {
+            var space = _particleSystem.GetActualSimulationSpace();
+            if (_isTrail && _particleSystem.trails.worldSpace)
+            {
+                space = ParticleSystemSimulationSpace.World;
+            }
+
+#if UNITY_EDITOR
+            if (!Application.isPlaying)
+            {
+                switch (space)
+                {
+                    case ParticleSystemSimulationSpace.World:
+                        return Matrix4x4.Translate(psPos)
+                               * Matrix4x4.Scale(scale)
+                               * Matrix4x4.Translate(-psPos);
+                }
+            }
+#endif
+
+            switch (space)
+            {
+                case ParticleSystemSimulationSpace.Local:
+                    return Matrix4x4.Translate(psPos)
+                           * Matrix4x4.Scale(scale);
+                case ParticleSystemSimulationSpace.World:
+                    return Matrix4x4.Scale(scale);
+                case ParticleSystemSimulationSpace.Custom:
+                    return Matrix4x4.Translate(_particleSystem.main.customSimulationSpace.position.GetScaled(scale))
+                           * Matrix4x4.Scale(scale);
+                default:
+                    throw new NotSupportedException();
+            }
+        }
+
+        /// <summary>
+        /// For world simulation, interpolate particle positions when the screen size is changed.
+        /// </summary>
+        /// <param name="psPos"></param>
+        /// <param name="scale"></param>
+        private void ResolveResolutionChange(Vector3 psPos, Vector3 scale)
+        {
+            var screenSize = new Vector2Int(Screen.width, Screen.height);
+            var isWorldSpace = _particleSystem.IsWorldSpace();
+            var canvasScale = _parent.canvas ? _parent.canvas.scaleFactor : 1f;
+            var resolutionChanged = _prevScreenSize != screenSize
+                                    || !Mathf.Approximately(_prevCanvasScale, canvasScale);
+            if (resolutionChanged && isWorldSpace && _isPrevStored)
+            {
+                // Update particle array size and get particles.
+                var size = _particleSystem.particleCount;
+                var particles = ParticleSystemExtensions.GetParticleArray(size);
+                _particleSystem.GetParticles(particles, size);
+
+                // Resolution resolver:
+                // (psPos / scale) / (prevPsPos / prevScale) -> psPos * scale.inv * prevPsPos.inv * prevScale
+                var modifier = psPos.GetScaled(
+                    scale.Inverse(),
+                    _prevPsPos.Inverse(),
+                    _prevScale);
+                for (var i = 0; i < size; i++)
+                {
+                    var particle = particles[i];
+                    particle.position = particle.position.GetScaled(modifier);
+                    particles[i] = particle;
+                }
+
+                _particleSystem.SetParticles(particles, size);
+
+                // Delay: Do not progress in the frame where the resolution has been changed.
+                _delay = true;
+                _prevScale = scale;
+                _prevPsPos = psPos;
+                _isPrevStored = true;
+            }
+
+            _prevCanvasScale = canvas ? canvas.scaleFactor : 1f;
+            _prevScreenSize = screenSize;
+        }
+
+        private void Simulate(Vector3 scale, bool paused)
+        {
+            var main = _particleSystem.main;
+            var deltaTime = paused
+                ? 0
+                : main.useUnscaledTime
+                    ? Time.unscaledDeltaTime
+                    : Time.deltaTime;
+
+            // Pre-warm:
+            if (0 < deltaTime && _preWarm)
+            {
+                deltaTime += main.duration;
+                _preWarm = false;
+            }
+
+            // get world position.
+            var isLocalSpace = _particleSystem.IsLocalSpace();
+            var psTransform = _particleSystem.transform;
+            var originLocalPosition = psTransform.localPosition;
+            var originLocalRotation = psTransform.localRotation;
+            var originWorldPosition = psTransform.position;
+            var originWorldRotation = psTransform.rotation;
+            var emission = _particleSystem.emission;
+            var rateOverDistance = emission.enabled
+                                   && 0 < emission.rateOverDistance.constant
+                                   && 0 < emission.rateOverDistanceMultiplier;
+            if (rateOverDistance && !paused && _isPrevStored)
+            {
+                // (For rate-over-distance emission,) Move to previous scaled position, simulate (delta = 0).
+                var prevScaledPos = isLocalSpace
+                    ? _prevPsPos
+                    : _prevPsPos.GetScaled(_prevScale.Inverse());
+                psTransform.SetPositionAndRotation(prevScaledPos, originWorldRotation);
+                _particleSystem.Simulate(0, false, false, false);
+            }
+
+            // Move to scaled position, simulate, revert to origin position.
+            var scaledPos = isLocalSpace
+                ? originWorldPosition
+                : originWorldPosition.GetScaled(scale.Inverse());
+            psTransform.SetPositionAndRotation(scaledPos, originWorldRotation);
+            _particleSystem.Simulate(deltaTime, false, false, false);
+            psTransform.localPosition = originLocalPosition;
+            psTransform.localRotation = originLocalRotation;
+        }
+
+#if UNITY_EDITOR
+        private void SimulateForEditor(Vector3 diffPos, Vector3 scale)
+        {
+            // Extra world simulation.
+            var isWorldSpace = _particleSystem.IsWorldSpace();
+            if (isWorldSpace && 0 < Vector3.SqrMagnitude(diffPos))
+            {
+                Profiler.BeginSample("[UIParticle] Bake Mesh > Extra world simulation");
+                diffPos.x *= 1f - 1f / Mathf.Max(0.001f, scale.x);
+                diffPos.y *= 1f - 1f / Mathf.Max(0.001f, scale.y);
+                diffPos.z *= 1f - 1f / Mathf.Max(0.001f, scale.z);
+
+                var size = _particleSystem.particleCount;
+                var particles = ParticleSystemExtensions.GetParticleArray(size);
+                _particleSystem.GetParticles(particles, size);
+                for (var i = 0; i < size; i++)
+                {
+                    var p = particles[i];
+                    p.position += diffPos;
+                    particles[i] = p;
+                }
+
+                _particleSystem.SetParticles(particles, size);
+                Profiler.EndSample();
+            }
+        }
+#endif
+
+        private void UpdateMaterialProperties()
+        {
+            if (_parent.m_AnimatableProperties.Length == 0) return;
+
+            if (s_Mpb == null)
+            {
+                s_Mpb = new MaterialPropertyBlock();
+            }
+
+            _renderer.GetPropertyBlock(s_Mpb);
+            if (s_Mpb.isEmpty) return;
+
+            // #41: Copy the value from MaterialPropertyBlock to CanvasRenderer
+            if (!_modifiedMaterial) return;
+
+            for (var i = 0; i < _parent.m_AnimatableProperties.Length; i++)
+            {
+                var ap = _parent.m_AnimatableProperties[i];
+                ap.UpdateMaterialProperties(_modifiedMaterial, s_Mpb);
+            }
+
+            s_Mpb.Clear();
+        }
+    }
+}

Runtime/UIParticleRenderer.cs.meta

@@ -0,0 +1,11 @@
+fileFormatVersion: 2
+guid: 0e66d2d1ba43c4cc4bc3e754e403297b
+MonoImporter:
+  externalObjects: {}
+  serializedVersion: 2
+  defaultReferences: []
+  executionOrder: 0
+  icon: {instanceID: 0}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 

Runtime/UIParticleUpdater.cs

@@ -0,0 +1,121 @@
+using System.Collections.Generic;
+using UnityEditor;
+using UnityEngine;
+
+namespace Coffee.UIExtensions
+{
+    internal static class UIParticleUpdater
+    {
+        private static readonly List<UIParticle> s_ActiveParticles = new List<UIParticle>();
+        private static readonly List<UIParticleAttractor> s_ActiveAttractors = new List<UIParticleAttractor>();
+        private static readonly HashSet<int> s_UpdatedGroupIds = new HashSet<int>();
+        private static int s_FrameCount;
+
+        public static int uiParticleCount => s_ActiveParticles.Count;
+
+        public static void Register(UIParticle particle)
+        {
+            if (!particle) return;
+            s_ActiveParticles.Add(particle);
+        }
+
+        public static void Unregister(UIParticle particle)
+        {
+            if (!particle) return;
+            s_ActiveParticles.Remove(particle);
+        }
+
+        public static void Register(UIParticleAttractor attractor)
+        {
+            if (!attractor) return;
+            s_ActiveAttractors.Add(attractor);
+        }
+
+        public static void Unregister(UIParticleAttractor attractor)
+        {
+            if (!attractor) return;
+            s_ActiveAttractors.Remove(attractor);
+        }
+
+#if UNITY_EDITOR
+        [InitializeOnLoadMethod]
+#else
+        [RuntimeInitializeOnLoadMethod(RuntimeInitializeLoadType.BeforeSceneLoad)]
+#endif
+        private static void InitializeOnLoad()
+        {
+            Canvas.willRenderCanvases -= Refresh;
+            Canvas.willRenderCanvases += Refresh;
+        }
+
+        private static void Refresh()
+        {
+            // Do not allow it to be called in the same frame.
+            if (s_FrameCount == Time.frameCount) return;
+            s_FrameCount = Time.frameCount;
+
+            // Simulate -> Primary
+            for (var i = 0; i < s_ActiveParticles.Count; i++)
+            {
+                var uip = s_ActiveParticles[i];
+                if (!uip || !uip.canvas || !uip.isPrimary || !s_UpdatedGroupIds.Add(uip.groupId)) continue;
+
+                uip.UpdateTransformScale();
+                uip.UpdateRenderers();
+            }
+
+            // Simulate -> Others
+            for (var i = 0; i < s_ActiveParticles.Count; i++)
+            {
+                var uip = s_ActiveParticles[i];
+                if (!uip || !uip.canvas) continue;
+
+                uip.UpdateTransformScale();
+
+                if (!uip.useMeshSharing)
+                {
+                    uip.UpdateRenderers();
+                }
+                else if (s_UpdatedGroupIds.Add(uip.groupId))
+                {
+                    uip.UpdateRenderers();
+                }
+            }
+
+            s_UpdatedGroupIds.Clear();
+
+            // Attract
+            for (var i = 0; i < s_ActiveAttractors.Count; i++)
+            {
+                s_ActiveAttractors[i].Attract();
+            }
+        }
+
+        public static void GetGroupedRenderers(int groupId, int index, List<UIParticleRenderer> results)
+        {
+            results.Clear();
+            for (var i = 0; i < s_ActiveParticles.Count; i++)
+            {
+                var uip = s_ActiveParticles[i];
+                if (uip.useMeshSharing && uip.groupId == groupId)
+                {
+                    results.Add(uip.GetRenderer(index));
+                }
+            }
+        }
+
+        internal static UIParticle GetPrimary(int groupId)
+        {
+            UIParticle primary = null;
+            for (var i = 0; i < s_ActiveParticles.Count; i++)
+            {
+                var uip = s_ActiveParticles[i];
+                if (!uip.useMeshSharing || uip.groupId != groupId) continue;
+                if (uip.isPrimary) return uip;
+                if (!primary && uip.canSimulate) primary = uip;
+            }
+
+            return primary;
+        }
+    }
+}

Runtime/UIParticleUpdater.cs.meta

@@ -1,5 +1,5 @@
 fileFormatVersion: 2
-guid: 16f0b0b6d0b7542bfbd20a3e05b04ff1
+guid: a0e708dc2e3034ba9a5c51db4252c7e0
 MonoImporter:
   externalObjects: {}
   serializedVersion: 2

Runtime/Utils.cs

@@ -0,0 +1,308 @@
+using System;
+using System.Collections.Generic;
+using System.Reflection;
+using UnityEngine;
+using Object = UnityEngine.Object;
+
+namespace Coffee.UIParticleExtensions
+{
+    public static class Color32Extensions
+    {
+        private static byte[] s_LinearToGammaLut;
+
+        public static byte LinearToGamma(this byte self)
+        {
+            if (s_LinearToGammaLut == null)
+            {
+                s_LinearToGammaLut = new byte[256];
+                for (var i = 0; i < 256; i++)
+                {
+                    s_LinearToGammaLut[i] = (byte)(Mathf.LinearToGammaSpace(i / 255f) * 255f);
+                }
+            }
+
+            return s_LinearToGammaLut[self];
+        }
+    }
+
+    public static class Vector3Extensions
+    {
+        public static Vector3 Inverse(this Vector3 self)
+        {
+            self.x = Mathf.Approximately(self.x, 0) ? 1 : 1 / self.x;
+            self.y = Mathf.Approximately(self.y, 0) ? 1 : 1 / self.y;
+            self.z = Mathf.Approximately(self.z, 0) ? 1 : 1 / self.z;
+            return self;
+        }
+
+        public static Vector3 GetScaled(this Vector3 self, Vector3 other1)
+        {
+            self.Scale(other1);
+            return self;
+        }
+
+        public static Vector3 GetScaled(this Vector3 self, Vector3 other1, Vector3 other2)
+        {
+            self.Scale(other1);
+            self.Scale(other2);
+            return self;
+        }
+
+        public static Vector3 GetScaled(this Vector3 self, Vector3 other1, Vector3 other2, Vector3 other3)
+        {
+            self.Scale(other1);
+            self.Scale(other2);
+            self.Scale(other3);
+            return self;
+        }
+
+        public static bool IsVisible(this Vector3 self)
+        {
+            return 0 < Mathf.Abs(self.x * self.y * self.z);
+        }
+    }
+
+    internal static class SpriteExtensions
+    {
+#if UNITY_EDITOR
+        private static readonly Type s_SpriteEditorExtensionType =
+            Type.GetType("UnityEditor.Experimental.U2D.SpriteEditorExtension, UnityEditor")
+            ?? Type.GetType("UnityEditor.U2D.SpriteEditorExtension, UnityEditor");
+
+        private static readonly MethodInfo s_GetActiveAtlasTextureMethodInfo = s_SpriteEditorExtensionType
+            .GetMethod("GetActiveAtlasTexture", BindingFlags.Static | BindingFlags.NonPublic);
+
+        public static Texture2D GetActualTexture(this Sprite self)
+        {
+            if (!self) return null;
+
+            if (Application.isPlaying) return self.texture;
+            var ret = s_GetActiveAtlasTextureMethodInfo.Invoke(null, new object[] { self }) as Texture2D;
+            return ret
+                ? ret
+                : self.texture;
+        }
+#else
+        internal static Texture2D GetActualTexture(this Sprite self)
+        {
+            return self ? self.texture : null;
+        }
+#endif
+    }
+
+    public static class ParticleSystemExtensions
+    {
+        private static ParticleSystem.Particle[] s_TmpParticles = new ParticleSystem.Particle[2048];
+
+        public static ParticleSystem.Particle[] GetParticleArray(int size)
+        {
+            if (s_TmpParticles.Length < size)
+            {
+                while (s_TmpParticles.Length < size)
+                {
+                    size = Mathf.NextPowerOfTwo(size);
+                }
+
+                s_TmpParticles = new ParticleSystem.Particle[size];
+            }
+
+            return s_TmpParticles;
+        }
+
+        public static void ValidateShape(this ParticleSystem self)
+        {
+            var shape = self.shape;
+            if (shape.enabled && shape.alignToDirection)
+            {
+                if (Mathf.Approximately(shape.scale.x * shape.scale.y * shape.scale.z, 0))
+                {
+                    if (Mathf.Approximately(shape.scale.x, 0))
+                    {
+                        shape.scale.Set(0.0001f, shape.scale.y, shape.scale.z);
+                    }
+                    else if (Mathf.Approximately(shape.scale.y, 0))
+                    {
+                        shape.scale.Set(shape.scale.x, 0.0001f, shape.scale.z);
+                    }
+                    else if (Mathf.Approximately(shape.scale.z, 0))
+                    {
+                        shape.scale.Set(shape.scale.x, shape.scale.y, 0.0001f);
+                    }
+                }
+            }
+        }
+
+        public static bool CanBakeMesh(this ParticleSystemRenderer self)
+        {
+            // #69: Editor crashes when mesh is set to null when `ParticleSystem.RenderMode = Mesh`
+            if (self.renderMode == ParticleSystemRenderMode.Mesh && self.mesh == null) return false;
+
+            // #61: When `ParticleSystem.RenderMode = None`, an error occurs
+            if (self.renderMode == ParticleSystemRenderMode.None) return false;
+
+            return true;
+        }
+
+        public static ParticleSystemSimulationSpace GetActualSimulationSpace(this ParticleSystem self)
+        {
+            var main = self.main;
+            var space = main.simulationSpace;
+            if (space == ParticleSystemSimulationSpace.Custom && !main.customSimulationSpace)
+            {
+                space = ParticleSystemSimulationSpace.Local;
+            }
+
+            return space;
+        }
+
+        public static bool IsLocalSpace(this ParticleSystem self)
+        {
+            return GetActualSimulationSpace(self) == ParticleSystemSimulationSpace.Local;
+        }
+
+        public static bool IsWorldSpace(this ParticleSystem self)
+        {
+            return GetActualSimulationSpace(self) == ParticleSystemSimulationSpace.World;
+        }
+
+        public static void SortForRendering(this List<ParticleSystem> self, Transform transform, bool sortByMaterial)
+        {
+            self.Sort((a, b) =>
+            {
+                var aRenderer = a.GetComponent<ParticleSystemRenderer>();
+                var bRenderer = b.GetComponent<ParticleSystemRenderer>();
+
+                // Render queue: ascending
+                var aMat = aRenderer.sharedMaterial ? aRenderer.sharedMaterial : aRenderer.trailMaterial;
+                var bMat = bRenderer.sharedMaterial ? bRenderer.sharedMaterial : bRenderer.trailMaterial;
+                if (!aMat && !bMat) return 0;
+                if (!aMat) return -1;
+                if (!bMat) return 1;
+
+                if (sortByMaterial)
+                {
+                    return aMat.GetInstanceID() - bMat.GetInstanceID();
+                }
+
+                if (aMat.renderQueue != bMat.renderQueue)
+                {
+                    return aMat.renderQueue - bMat.renderQueue;
+                }
+
+                // Sorting layer: ascending
+                if (aRenderer.sortingLayerID != bRenderer.sortingLayerID)
+                {
+                    return SortingLayer.GetLayerValueFromID(aRenderer.sortingLayerID) -
+                           SortingLayer.GetLayerValueFromID(bRenderer.sortingLayerID);
+                }
+
+                // Sorting order: ascending
+                if (aRenderer.sortingOrder != bRenderer.sortingOrder)
+                {
+                    return aRenderer.sortingOrder - bRenderer.sortingOrder;
+                }
+
+                // Z position & sortingFudge: descending
+                var aTransform = a.transform;
+                var bTransform = b.transform;
+                var aPos = transform.InverseTransformPoint(aTransform.position).z + aRenderer.sortingFudge;
+                var bPos = transform.InverseTransformPoint(bTransform.position).z + bRenderer.sortingFudge;
+                if (!Mathf.Approximately(aPos, bPos))
+                {
+                    return (int)Mathf.Sign(bPos - aPos);
+                }
+
+                return (int)Mathf.Sign(GetIndex(self, a) - GetIndex(self, b));
+            });
+        }
+
+        private static int GetIndex(IList<ParticleSystem> list, Object ps)
+        {
+            for (var i = 0; i < list.Count; i++)
+            {
+                if (list[i].GetInstanceID() == ps.GetInstanceID())
+                {
+                    return i;
+                }
+            }
+
+            return 0;
+        }
+
+        public static Texture2D GetTextureForSprite(this ParticleSystem self)
+        {
+            if (!self) return null;
+
+            // Get sprite's texture.
+            var tsaModule = self.textureSheetAnimation;
+            if (!tsaModule.enabled || tsaModule.mode != ParticleSystemAnimationMode.Sprites) return null;
+
+            for (var i = 0; i < tsaModule.spriteCount; i++)
+            {
+                var sprite = tsaModule.GetSprite(i);
+                if (!sprite) continue;
+
+                return sprite.GetActualTexture();
+            }
+
+            return null;
+        }
+
+        public static void Exec(this List<ParticleSystem> self, Action<ParticleSystem> action)
+        {
+            self.RemoveAll(p => !p);
+            self.ForEach(action);
+        }
+    }
+
+    internal static class Misc
+    {
+        public static void Destroy(Object obj)
+        {
+            if (!obj) return;
+#if UNITY_EDITOR
+            if (!Application.isPlaying)
+            {
+                Object.DestroyImmediate(obj);
+            }
+            else
+#endif
+            {
+                Object.Destroy(obj);
+            }
+        }
+
+        public static void DestroyImmediate(Object obj)
+        {
+            if (!obj) return;
+#if UNITY_EDITOR
+            if (Application.isEditor)
+            {
+                Object.DestroyImmediate(obj);
+            }
+            else
+#endif
+            {
+                Object.Destroy(obj);
+            }
+        }
+
+#if !UNITY_2021_2_OR_NEWER && !UNITY_2020_3_45 && !UNITY_2020_3_46 && !UNITY_2020_3_47 && !UNITY_2020_3_48
+        public static T GetComponentInParent<T>(this Component self, bool includeInactive) where T : Component
+        {
+            if (!self) return null;
+            if (!includeInactive) return self.GetComponentInParent<T>();
+
+            var current = self.transform;
+            while (current)
+            {
+                var component = current.GetComponent<T>();
+                if (component) return component;
+                current = current.parent;
+            }
+
+            return null;
+        }
+#endif
+    }
+}

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Samples~/Demo/Scripts/Coffee.UIParticle.Demo.asmdef

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+{
+    "name": "Coffee.UIParticle.Demo",
+    "references": [
+        "Coffee.UIParticle"
+    ],
+    "optionalUnityReferences": [],
+    "includePlatforms": [],
+    "excludePlatforms": [],
+    "allowUnsafeCode": false,
+    "overrideReferences": false,
+    "precompiledReferences": [],
+    "autoReferenced": false,
+    "defineConstraints": []
+}

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Samples~/Demo/Scripts/CopyItemOnStart.cs

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+using UnityEngine;
+using UnityEngine.Serialization;
+
+namespace Coffee.UIExtensions.Demo
+{
+    public class CopyItemOnStart : MonoBehaviour
+    {
+        [FormerlySerializedAs("origin")]
+        [SerializeField]
+        private GameObject m_Origin;
+
+        [FormerlySerializedAs("count")]
+        [SerializeField]
+        private int m_Count;
+
+        private void Start()
+        {
+            if (!m_Origin) return;
+            m_Origin.SetActive(false);
+
+            var parent = m_Origin.transform.parent;
+            for (var i = 0; i < m_Count; i++)
+            {
+                var go = Instantiate(m_Origin, parent, false);
+                go.name = $"{m_Origin.name} {i + 1}";
+                go.hideFlags = HideFlags.DontSave;
+                go.SetActive(true);
+            }
+        }
+    }
+}

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Samples~/Demo/Scripts/UIElementDragger.cs

@@ -0,0 +1,93 @@
+using System;
+using UnityEngine;
+using UnityEngine.EventSystems;
+using UnityEngine.Serialization;
+
+public class UIElementDragger : MonoBehaviour, IBeginDragHandler, IDragHandler, IEndDragHandler
+{
+    [SerializeField]
+    private Target m_Target;
+
+    [SerializeField]
+    private Transform m_CustomTarget;
+
+    [FormerlySerializedAs("ex2")]
+    [SerializeField]
+    private bool m_UseCanvasScale;
+
+    private Canvas _canvas;
+    private RectTransform _rectTransform;
+
+    private void OnEnable()
+    {
+        _rectTransform = GetComponent<RectTransform>();
+        _canvas = GetComponentInParent<Canvas>();
+    }
+
+    public void OnBeginDrag(PointerEventData eventData)
+    {
+    }
+
+    public void OnDrag(PointerEventData eventData)
+    {
+        var delta = (Vector3)GetLocalDelta(eventData.delta);
+
+        switch (m_Target)
+        {
+            case Target.Self:
+                _rectTransform.localPosition += delta;
+                break;
+            case Target.Parent:
+                _rectTransform.parent.localPosition += delta;
+                break;
+            case Target.Custom:
+                _rectTransform.localPosition += delta;
+                if (m_CustomTarget)
+                {
+                    if (m_UseCanvasScale)
+                    {
+                        delta.Scale(_canvas.rootCanvas.transform.localScale);
+                    }
+
+                    m_CustomTarget.localPosition += delta;
+                }
+
+                break;
+        }
+    }
+
+    public void OnEndDrag(PointerEventData eventData)
+    {
+    }
+
+    private Vector2 GetLocalDelta(Vector2 evDelta)
+    {
+        switch (_canvas.renderMode)
+        {
+            case RenderMode.ScreenSpaceOverlay:
+            {
+                var zero = transform.InverseTransformPoint(Vector2.zero);
+                var delta = transform.InverseTransformPoint(evDelta);
+                return delta - zero;
+            }
+            case RenderMode.ScreenSpaceCamera:
+            case RenderMode.WorldSpace:
+            {
+                RectTransformUtility.ScreenPointToLocalPointInRectangle(_rectTransform, Vector2.zero,
+                    _canvas.worldCamera, out var zero);
+                RectTransformUtility.ScreenPointToLocalPointInRectangle(_rectTransform, evDelta,
+                    _canvas.worldCamera, out var delta);
+                return delta - zero;
+            }
+            default:
+                throw new NotSupportedException();
+        }
+    }
+
+    private enum Target
+    {
+        Self,
+        Parent,
+        Custom
+    }
+}

Samples~/Demo/Scripts/UIElementDragger.cs.meta

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Samples~/Demo/Scripts/UIParticle_Demo.cs

@@ -0,0 +1,177 @@
+using UnityEngine;
+using UnityEngine.Serialization;
+using UnityEngine.UI;
+
+namespace Coffee.UIExtensions.Demo
+{
+    public class UIParticle_Demo : MonoBehaviour
+    {
+        [FormerlySerializedAs("root")]
+        [SerializeField]
+        private Canvas m_RootCanvas;
+
+        private int _height;
+        private int _score;
+        private int _width;
+
+        private void Start()
+        {
+            _width = Screen.width;
+            _height = Screen.height;
+        }
+
+        public void ResizeScreen()
+        {
+            switch (Application.platform)
+            {
+                case RuntimePlatform.OSXPlayer:
+                case RuntimePlatform.WindowsPlayer:
+                case RuntimePlatform.LinuxPlayer:
+                    if (Screen.width == _width && Screen.height == _height)
+                    {
+                        Screen.SetResolution(_height, _width, Screen.fullScreen);
+                    }
+                    else if (Screen.width == _height && Screen.height == _width)
+                    {
+                        Screen.SetResolution(Mathf.Min(_width, _height), Mathf.Min(_width, _height), Screen.fullScreen);
+                    }
+                    else
+                    {
+                        Screen.SetResolution(_width, _height, Screen.fullScreen);
+                    }
+
+                    break;
+            }
+        }
+
+        public void FullScreen()
+        {
+            Screen.fullScreen = !Screen.fullScreen;
+        }
+
+        public void EnableAnimations(bool flag)
+        {
+            foreach (var animator in FindObjectsOfType<Animator>())
+            {
+                animator.enabled = flag;
+            }
+        }
+
+        public void UIParticle_MeshSharing(bool flag)
+        {
+            foreach (var uip in m_RootCanvas.GetComponentsInChildren<UIParticle>(true))
+            {
+                uip.meshSharing = flag
+                    ? UIParticle.MeshSharing.Auto
+                    : UIParticle.MeshSharing.None;
+            }
+        }
+
+        public void UIParticle_RandomGroup(bool flag)
+        {
+            foreach (var uip in m_RootCanvas.GetComponentsInChildren<UIParticle>(true))
+            {
+                uip.groupMaxId = flag
+                    ? 4
+                    : 0;
+            }
+        }
+
+        public void UIParticle_Scale(float scale)
+        {
+            foreach (var uip in FindObjectsOfType<UIParticle>())
+            {
+                uip.scale = scale;
+            }
+        }
+
+        public void ParticleSystem_WorldSpaseSimulation(bool flag)
+        {
+            foreach (var p in FindObjectsOfType<ParticleSystem>())
+            {
+                var main = p.main;
+                main.simulationSpace = flag
+                    ? ParticleSystemSimulationSpace.World
+                    : ParticleSystemSimulationSpace.Local;
+            }
+        }
+
+        public void ParticleSystem_WorldSpaseSimulation(ParticleSystem ps)
+        {
+            foreach (var p in ps.GetComponentsInChildren<ParticleSystem>())
+            {
+                var main = p.main;
+                main.simulationSpace = ParticleSystemSimulationSpace.World;
+                p.Clear();
+            }
+        }
+
+        public void ParticleSystem_LocalSpaseSimulation(ParticleSystem ps)
+        {
+            foreach (var p in ps.GetComponentsInChildren<ParticleSystem>())
+            {
+                var main = p.main;
+                main.simulationSpace = ParticleSystemSimulationSpace.Local;
+                p.Clear();
+            }
+        }
+
+        public void ParticleSystem_Emit(ParticleSystem ps)
+        {
+            ps.Emit(5);
+        }
+
+        public void ParticleSystem_SetScale(float scale)
+        {
+            foreach (var ps in FindObjectsOfType<ParticleSystem>())
+            {
+                ps.transform.localScale = new Vector3(scale, scale, scale);
+            }
+        }
+
+        public void UIParticleAttractor_Linear(UIParticleAttractor attractor)
+        {
+            attractor.movement = UIParticleAttractor.Movement.Linear;
+        }
+
+        public void UIParticleAttractor_Smooth(UIParticleAttractor attractor)
+        {
+            attractor.movement = UIParticleAttractor.Movement.Smooth;
+        }
+
+        public void UIParticleAttractor_Sphere(UIParticleAttractor attractor)
+        {
+            attractor.movement = UIParticleAttractor.Movement.Sphere;
+        }
+
+        public void UIParticleAttractor_OnAttract(Text scoreText)
+        {
+            _score++;
+            scoreText.text = _score.ToString();
+            scoreText.GetComponent<Animator>().Play(0);
+        }
+
+        public void Canvas_WorldSpace(bool flag)
+        {
+            if (!flag) return;
+
+            m_RootCanvas.renderMode = RenderMode.ScreenSpaceCamera;
+            m_RootCanvas.renderMode = RenderMode.WorldSpace;
+            m_RootCanvas.transform.rotation = Quaternion.Euler(new Vector3(0, 10, 0));
+        }
+
+        public void Canvas_CameraSpace(bool flag)
+        {
+            if (!flag) return;
+
+            m_RootCanvas.renderMode = RenderMode.ScreenSpaceCamera;
+        }
+
+        public void Canvas_Overlay(bool flag)
+        {
+            if (!flag) return;
+
+            m_RootCanvas.renderMode = RenderMode.ScreenSpaceOverlay;
+        }
+    }
+}

Samples~/Demo/Scripts/UIParticle_Demo.cs.meta

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Samples~/Demo/Scripts/UIParticle_Demo_UIParticleController.cs

@@ -0,0 +1,40 @@
+using UnityEngine;
+using UnityEngine.Serialization;
+
+namespace Coffee.UIExtensions.Demo
+{
+    public class UIParticle_Demo_UIParticleController : MonoBehaviour
+    {
+        [FormerlySerializedAs("root")]
+        [SerializeField]
+        private Transform m_RootTransform;
+
+        public void UIParticle_MeshSharing(bool flag)
+        {
+            foreach (var uip in m_RootTransform.GetComponentsInChildren<UIParticle>(true))
+            {
+                uip.meshSharing = flag
+                    ? UIParticle.MeshSharing.Auto
+                    : UIParticle.MeshSharing.None;
+            }
+        }
+
+        public void UIParticle_RandomGroup(bool flag)
+        {
+            foreach (var uip in m_RootTransform.GetComponentsInChildren<UIParticle>(true))
+            {
+                uip.groupMaxId = flag
+                    ? 4
+                    : 0;
+            }
+        }
+
+        public void UIParticle_Scale(float scale)
+        {
+            foreach (var uip in m_RootTransform.GetComponentsInChildren<UIParticle>(true))
+            {
+                uip.scale = scale;
+            }
+        }
+    }
+}

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