docs: update readme

close #407

.github/CODEOWNERS

@@ -0,0 +1,6 @@
+# This is a comment.
+# Each line is a file pattern followed by one or more owners.
+# https://docs.github.com/ja/repositories/managing-your-repositorys-settings-and-features/customizing-your-repository/about-code-owners
+
+# Default owners
+* @mob-sakai

.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. 1.0.0]
+ - Platform: [e.g. Editor(Windows/Mac), Standalone(Windows/Mac), iOS, Android, WebGL]
+ - Unity version: [e.g. 2018.2.8f1]
+ - 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 +1,37 @@
+
+# Pull Request Template
+
+## Description
+
+- Please include a summary of the change and which issue is fixed.
+- Please also include relevant motivation and context.
+- List any dependencies that are required for this change.
+
+Fixes #{issue_number}
+
+## Type of change
+
+Please write the commit message in the format corresponding to the change type.
+Please see [Conventional Commits](https://www.conventionalcommits.org/en/v1.0.0/) for more information.
+
+- [ ] Bug fix (non-breaking change which fixes an issue)  
+- [ ] New feature (non-breaking change which adds functionality)  
+- [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
+- [ ] Update documentations
+- [ ] Others (refactoring, style changes, etc.)
+
+## Test environment
+
+- Platform: [e.g. Editor(Windows/Mac), Standalone(Windows/Mac), iOS, Android, WebGL]
+- Unity version: [e.g. 2022.2.0f1]
+- Build options: [e.g. IL2CPP, .Net 4.x, URP/HDRP]
+
+## Checklist
+
+- [ ] This pull request is for merging into the `develop` branch
+- [ ] My code follows the style guidelines of this project
+- [ ] I have performed a self-review of my own code
+- [ ] I have commented my code, particularly in hard-to-understand areas
+- [ ] I have made corresponding changes to the documentation
+- [ ] My changes generate no new warnings
+- [ ] I have checked my code and corrected any misspellings

.github/workflows/release.yml

@@ -27,10 +27,10 @@ jobs:
       split_to: ${{ steps.summary.outputs.split_to }}
     steps:
       - name: 🚚 Checkout (${{ github.ref_name }})
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: 🔖 Run semantic release
-        uses: cycjimmy/semantic-release-action@v5
+        uses: cycjimmy/semantic-release-action@v6
         id: release
         with:
           working_directory: Packages/src
@@ -38,7 +38,7 @@ jobs:
             @semantic-release/changelog
             @semantic-release/git
         env:
-          GITHUB_TOKEN: ${{ secrets.GH_TOKEN }}
+          GITHUB_TOKEN: ${{ github.token }}
 
       - id: summary
         run: |

.github/workflows/test.yml

@@ -7,9 +7,9 @@ run-name: 🧪 Test (${{ github.event.pull_request.title || github.ref_name }})
 
 env:
   # MINIMUM_VERSION: The minimum version of Unity.
-  MINIMUM_VERSION: 2019.4
+  MINIMUM_VERSION: 2020.3
   # EXCLUDE_FILTER: The excluded versions of Unity.
-  EXCLUDE_FILTER: "(2020.2.0|2021.1|2023.3)"
+  EXCLUDE_FILTER: "(2017|2018|2023.3)"
   PROJECT_PATH: .
 
 on:
@@ -27,7 +27,7 @@ on:
       - "!*"
     paths-ignore:
       - "**.md"
-  pull_request_target:
+  pull_request:
     types:
       - opened
       - reopened
@@ -39,16 +39,29 @@ jobs:
   setup:
     name: ⚙️ Setup
     runs-on: ubuntu-latest
+    permissions: {} # No permissions needed for setup job
     outputs:
       unityVersions: ${{ steps.setup.outputs.unityVersions }}
     steps:
+      - name: 🔑 Secrets check
+        run: |
+          if [ -z "$UNITY_EMAIL" ] || [ -z "$UNITY_PASSWORD" ] || [ -z "UNITY_LICENSE" ]; then
+            echo "Error: UNITY_EMAIL, UNITY_PASSWORD, and UNITY_LICENSE secrets must be set." | tee -a $GITHUB_STEP_SUMMARY >&2
+            echo "Error: See https://game.ci/docs/github/test-runner#basic-setup" | tee -a $GITHUB_STEP_SUMMARY >&2
+            echo "Error: Set the secrets at ${{ github.server_url }}/${{ github.repository }}/settings/secrets/actions" | tee -a $GITHUB_STEP_SUMMARY >&2
+            exit 1
+          fi
+        env:
+          UNITY_EMAIL: ${{ secrets.UNITY_EMAIL }}
+          UNITY_PASSWORD: ${{ secrets.UNITY_PASSWORD }}
+          UNITY_LICENSE: ${{ secrets.UNITY_LICENSE }}
       - name: ⚙️ Find target Unity versions
         id: setup
         run: |
           echo "==== Target Unity Versions ===="
-          LATEST_VERSIONS=`npx unity-changeset@latest list --versions --latest-patch --min ${MINIMUM_VERSION} --json --all`
+          LATEST_VERSIONS=`npx -y unity-changeset@latest list --json --versions --all --latest-patch --ignore-alpha --min ${MINIMUM_VERSION}`
           if [ "${{ inputs.usePeriodVersions }}" = "true" ]; then
-            ADDITIONAL_VERSIONS=`npx unity-changeset list --versions --grep '0f' --min ${MINIMUM_VERSION} --json`
+            ADDITIONAL_VERSIONS=`npx -y unity-changeset@latest list --json --versions --ignore-alpha --min ${MINIMUM_VERSION} --grep '0f'`
           else
             ADDITIONAL_VERSIONS=[]
           fi
@@ -66,31 +79,15 @@ jobs:
     needs: setup
     strategy:
       fail-fast: false
-      max-parallel: 6
+      max-parallel: 8
       matrix:
         unityVersion: ${{ fromJson(needs.setup.outputs.unityVersions) }}
     steps:
       - name: 🚚 Checkout ($${{ github.ref }})
-        if: github.event_name == 'push'
-        uses: actions/checkout@v5
-
-      - name: 🚚 Checkout pull request (pull_request_target)
-        if: github.event_name == 'pull_request_target'
-        uses: actions/checkout@v5
-        with:
-          ref: ${{ github.event.pull_request.head.sha }}
-          fetch-depth: 0
-
-      - name: 🚚 Marge pull request (pull_request_target)
-        if: github.event_name == 'pull_request_target'
-        run: |
-          git config user.name "GitHub Actions"
-          git config user.email "actions@github.com"
-          git rebase ${{ github.event.pull_request.base.sha }}
-          git log --oneline -n 10
+        uses: actions/checkout@v6
 
       - name: 📥 Cache library
-        uses: actions/cache@v4
+        uses: actions/cache@v5
         with:
           path: ${{ env.PROJECT_PATH }}/Library
           key: ${{ env.PROJECT_PATH }}-Library-${{ matrix.unityVersion }}-${{ github.event.pull_request.head.sha || github.sha }}
@@ -99,7 +96,7 @@ jobs:
             ${{ env.PROJECT_PATH }}-Library-
 
       - name: 🛠️ Build Unity Project (Test)
-        uses: game-ci/unity-builder@main
+        uses: game-ci/unity-builder@v5
         timeout-minutes: 45
         with:
           customImage: ghcr.io/mob-sakai/unity3d:${{ matrix.unityVersion }}

Packages/manifest.json

@@ -3,7 +3,7 @@
     "com.coffee.development": "https://github.com/mob-sakai/Coffee.Internal.git?path=Packages/Development",
     "com.coffee.minimal-resource": "https://github.com/mob-sakai/Coffee.Internal.git?path=Packages/MinimalResource",
     "com.coffee.nano-monitor": "https://github.com/mob-sakai/Coffee.Internal.git?path=Packages/NanoMonitor",
-    "com.unity.ide.rider": "3.0.31",
+    "com.unity.ide.rider": "3.0.36",
     "com.unity.test-framework": "1.1.33",
     "com.unity.modules.animation": "1.0.0",
     "com.unity.modules.physics": "1.0.0"

Packages/packages-lock.json

@@ -40,7 +40,7 @@
       "url": "https://packages.unity.com"
     },
     "com.unity.ide.rider": {
-      "version": "3.0.31",
+      "version": "3.0.36",
       "depth": 0,
       "source": "registry",
       "dependencies": {

Packages/src/CHANGELOG.md

@@ -1,3 +1,20 @@
+## [4.12.2](https://github.com/mob-sakai/ParticleEffectForUGUI/compare/v4.12.1...v4.12.2) (2026-06-08)
+
+
+### Bug Fixes
+
+* add `meshCleared` flag to optimize mesh clearing ([859fa20](https://github.com/mob-sakai/ParticleEffectForUGUI/commit/859fa20d297c3f44e3361f20dbb7ce966407e03e))
+* fix Unity6.5 compile errors and warnings ([a5ee687](https://github.com/mob-sakai/ParticleEffectForUGUI/commit/a5ee6878212be2fc4d7b48879426f239e8753009)), closes [#400](https://github.com/mob-sakai/ParticleEffectForUGUI/issues/400)
+* potential access to UIParticleRenderer that has already been destroyed ([b740dd6](https://github.com/mob-sakai/ParticleEffectForUGUI/commit/b740dd662d423c6bef849662ce1b0bfbb4940ed4)), closes [#403](https://github.com/mob-sakai/ParticleEffectForUGUI/issues/403)
+* updated support for some changed menu paths ([f8ac986](https://github.com/mob-sakai/ParticleEffectForUGUI/commit/f8ac9869f141238169730e74f5d65c4fc6081f51)), closes [#397](https://github.com/mob-sakai/ParticleEffectForUGUI/issues/397)
+
+## [4.12.1](https://github.com/mob-sakai/ParticleEffectForUGUI/compare/v4.12.0...v4.12.1) (2026-03-24)
+
+
+### Bug Fixes
+
+* ignore "EditorOnly" tagged gameObjects on refresh ([031d46a](https://github.com/mob-sakai/ParticleEffectForUGUI/commit/031d46a3216c942d2d1a6ccfadf5f0b9e3ce3006))
+
 # [4.12.0](https://github.com/mob-sakai/ParticleEffectForUGUI/compare/v4.11.4...v4.12.0) (2026-03-24)
 
 

Packages/src/Editor/AnimatablePropertyEditor.cs

@@ -78,10 +78,19 @@ namespace Coffee.UIExtensions
                 var mat = mats[j];
                 if (mat == null || mat.shader == null) continue;
 
+#if UNITY_6000_5_OR_NEWER
+                for (var i = 0; i < mat.shader.GetPropertyCount(); i++)
+#else
                 for (var i = 0; i < ShaderUtil.GetPropertyCount(mat.shader); i++)
+#endif
                 {
+#if UNITY_6000_5_OR_NEWER
+                    var name = mat.shader.GetPropertyName(i);
+                    var type = (AnimatableProperty.ShaderPropertyType)mat.shader.GetPropertyType(i);
+#else
                     var name = ShaderUtil.GetPropertyName(mat.shader, i);
                     var type = (AnimatableProperty.ShaderPropertyType)ShaderUtil.GetPropertyType(mat.shader, i);
+#endif
                     if (!s_Names.Add(name)) continue;
 
                     AddMenu(gm, sp, new ShaderProperty(name, type), true);

Packages/src/Editor/UIParticleEditor.cs

@@ -1,3 +1,4 @@
+using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Text.RegularExpressions;
@@ -8,12 +9,11 @@ using UnityEngine;
 using UnityEngine.Profiling;
 using UnityEngine.UI;
 using Coffee.UIParticleInternal;
+using Object = UnityEngine.Object;
 #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;
@@ -49,6 +49,7 @@ namespace Coffee.UIExtensions
         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 GUIContent s_Remove = new GUIContent("Remove");
         private static readonly Regex s_RegexBuiltInGuid = new Regex(@"^0{16}.0{15}$", RegexOptions.Compiled);
         private static readonly List<Material> s_TempMaterials = new List<Material>();
 
@@ -66,6 +67,7 @@ namespace Coffee.UIExtensions
         private ReorderableList _ro;
         private bool _showMax;
         private bool _is3DScaleMode;
+        private GameObject[] _gameObjects;
 
         private static readonly HashSet<Shader> s_Shaders = new HashSet<Shader>();
 #if UNITY_2018 || UNITY_2019
@@ -183,6 +185,13 @@ namespace Coffee.UIExtensions
                                  y.hasMultipleDifferentValues ||
                                  z.hasMultipleDifferentValues;
             }
+
+            // Add temporary ParticleSystem for preview if enabled.
+            if (UIParticleProjectSettings.s_PreviewOnSelectOnSelect)
+            {
+                _gameObjects = targets.OfType<UIParticle>().Select(x => x.gameObject).ToArray();
+                ParticleSystemPreviewSystem.Register(_gameObjects);
+            }
         }
 
         /// <summary>
@@ -197,7 +206,10 @@ namespace Coffee.UIExtensions
             serializedObject.Update();
 
             // Maskable
-            EditorGUILayout.PropertyField(_maskable);
+            if (_maskable != null)
+            {
+                EditorGUILayout.PropertyField(_maskable);
+            }
 
             // Scale
             EditorGUI.BeginDisabledGroup(!_meshSharing.hasMultipleDifferentValues && _meshSharing.intValue == 4);
@@ -344,6 +356,10 @@ namespace Coffee.UIExtensions
                 }
             }
 #endif
+
+            // Remove the temporary ParticleSystem.
+            ParticleSystemPreviewSystem.DrawWarningForTemporary(_gameObjects);
+
             Profiler.EndSample();
         }
 
@@ -482,7 +498,7 @@ namespace Coffee.UIExtensions
 #endif
         }
 
-        private static bool FixButton(bool show, string text)
+        private static bool FixButton(bool show, string text, GUIContent buttonText = null)
         {
             if (!show) return false;
             using (new EditorGUILayout.HorizontalScope(GUILayout.ExpandWidth(true)))
@@ -490,7 +506,7 @@ namespace Coffee.UIExtensions
                 EditorGUILayout.HelpBox(text, MessageType.Warning, true);
                 using (new EditorGUILayout.VerticalScope())
                 {
-                    return GUILayout.Button(s_ContentFix, GUILayout.Width(30));
+                    return GUILayout.Button(buttonText ?? s_ContentFix, GUILayout.ExpandWidth(false));
                 }
             }
         }

Packages/src/Editor/UIParticleMenu.cs

@@ -6,11 +6,22 @@ namespace Coffee.UIExtensions
 {
     internal class UIParticleMenu
     {
-        [MenuItem("GameObject/UI/Particle System (Empty)", false, 2018)]
+#if UNITY_6000_5_OR_NEWER
+        private const string k_MenuPathToCreateParticleSystem = "GameObject/Visual Effects/Particle System";
+#else
+        private const string k_MenuPathToCreateParticleSystem = "GameObject/Effects/Particle System";
+#endif
+#if UNITY_6000_3_OR_NEWER
+        private const string k_MenuPathForUgui = "GameObject/UI (Canvas)";
+#else
+        private const string k_MenuPathForUgui = "GameObject/UI";
+#endif
+
+        [MenuItem(k_MenuPathForUgui + "/Particle System (Empty)", false, 2018)]
         private static void AddParticleEmpty(MenuCommand menuCommand)
         {
             // Create empty UI element.
-            EditorApplication.ExecuteMenuItem("GameObject/UI/Image");
+            EditorApplication.ExecuteMenuItem(k_MenuPathForUgui + "/Image");
             var ui = Selection.activeGameObject;
             Object.DestroyImmediate(ui.GetComponent<Image>());
 
@@ -21,7 +32,7 @@ namespace Coffee.UIExtensions
             uiParticle.rectTransform.sizeDelta = Vector2.zero;
         }
 
-        [MenuItem("GameObject/UI/Particle System", false, 2019)]
+        [MenuItem(k_MenuPathForUgui + "/Particle System", false, 2019)]
         private static void AddParticle(MenuCommand menuCommand)
         {
             // Create empty UIEffect.
@@ -29,7 +40,7 @@ namespace Coffee.UIExtensions
             var uiParticle = Selection.activeGameObject.GetComponent<UIParticle>();
 
             // Create ParticleSystem.
-            EditorApplication.ExecuteMenuItem("GameObject/Effects/Particle System");
+            EditorApplication.ExecuteMenuItem(k_MenuPathToCreateParticleSystem);
             var ps = Selection.activeGameObject;
             ps.transform.SetParent(uiParticle.transform, false);
             ps.transform.localPosition = Vector3.zero;

Packages/src/README.md

@@ -183,9 +183,14 @@ _This package requires **Unity 2018.3 or later**._
 - **Time Scale Multiplier:** Time scale multiplier.
 - **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
+> [!TIPS]
+> Press the `Refresh` button to reconstruct the rendering order based on children ParticleSystem's sorting order
 and z-position.
 
+> [!TIPS]
+> When a `GameObject` with this component is selected in the editor, a temporary `ParticleSystem` is added if needed so you can preview the effect in the Scene view.
+> The generated `ParticleSystem` is marked with `HideFlags.DontSave`, so it is neither saved nor included in builds.
+
 <br><br>
 
 ### Basic Usage
@@ -195,6 +200,10 @@ and z-position.
 2. Adjust the ParticleSystem as you like.
    ![particle1](https://user-images.githubusercontent.com/12690315/95007359-ca385200-0649-11eb-8383-627c9750bda8.png)
 
+> [!Tips]
+> Adding a `UIParticle` to the parent is the recommended setup rather than attaching it directly to the `ParticleSystem`.
+> When using `ParticleSystem.emission.rateOverDistance`, it is recommended to move the transform of `UIParticle` rather than the `ParticleSystem`.
+
 <br>
 
 ### Usage with Your Existing ParticleSystem Prefab
@@ -256,13 +265,34 @@ uiParticle.Stop();
     - **Unscaled Time:** Update with unscaled delta time.
 - **OnAttracted**: An event called when attracting is complete (per particle).
 
+
+<br><br>
+
+### Component: ParticleSystemPreviewer
+
+`ParticleSystemPreviewer` is used to preview a ParticleSystem in the editor.
+
+- When a `GameObject` with this component is selected in the editor, a temporary `ParticleSystem` is added if needed so you can preview the effect in the Scene view.
+- The generated `ParticleSystem` is marked with `HideFlags.DontSave`, so it is neither saved nor included in builds.
+
+
 <br><br>
 
 ### Project Settings
 
-![](https://github.com/user-attachments/assets/befc7f34-fb47-4006-831a-eba79fda11ca)
+You can adjust the project-wide settings for `UI Particle`. (`Edit > Project Settings > UI > UI Particle`)
 
-- Click `Edit > Project Settings` to open the Project Settings window and then select `UI > UI Particle` category.
+![](https://github.com/mob-sakai/mob-sakai/releases/download/docs/1782270746550.png)
+
+#### Settings
+
+- **Enable Linear To Gamma**: Automatically correct the color space of the mesh.
+
+#### Editor
+
+- **Hide Generated Component**: Automatically hide the generated `UIParticleRenderer` component and `UIParticle BakingCamera`.
+
+- **Preview On Select**: When selecting UIParticle, a temporary ParticleSystem is generated for preview.
 
 <br><br>
 

Packages/src/Runtime/AnimatableProperty.cs

@@ -37,37 +37,17 @@ namespace Coffee.UIExtensions
             switch (type)
             {
                 case ShaderPropertyType.Color:
-                    var color = mpb.GetColor(id);
-                    if (color != default)
-                    {
-                        material.SetColor(id, color);
-                    }
-
+                    material.SetColor(id, mpb.GetColor(id));
                     break;
                 case ShaderPropertyType.Vector:
-                    var vector = mpb.GetVector(id);
-                    if (vector != default)
-                    {
-                        material.SetVector(id, vector);
-                    }
-
+                    material.SetVector(id, mpb.GetVector(id));
                     break;
                 case ShaderPropertyType.Float:
                 case ShaderPropertyType.Range:
-                    var value = mpb.GetFloat(id);
-                    if (!Mathf.Approximately(value, 0))
-                    {
-                        material.SetFloat(id, value);
-                    }
-
+                    material.SetFloat(id, mpb.GetFloat(id));
                     break;
                 case ShaderPropertyType.Texture:
-                    var tex = mpb.GetTexture(id);
-                    if (tex != default(Texture))
-                    {
-                        material.SetTexture(id, tex);
-                    }
-
+                    material.SetTexture(id, mpb.GetTexture(id));
                     break;
             }
         }

Packages/src/Runtime/Internal/Extensions/ComponentExtensions.cs

@@ -12,6 +12,33 @@ namespace Coffee.UIParticleInternal
     /// </summary>
     internal static class ComponentExtensions
     {
+#if !UNITY_2019_2_OR_NEWER
+        public static bool TryGetComponent<T>(this GameObject self, out T component)
+            where T : Component
+        {
+            if (self == null)
+            {
+                component = null;
+                return false;
+            }
+
+            component = self.GetComponent<T>();
+            return component != null;
+        }
+
+        public static bool TryGetComponent<T>(this Component self, out T component)
+            where T : Component
+        {
+            if (self == null)
+            {
+                component = null;
+                return false;
+            }
+
+            return self.gameObject.TryGetComponent(out component);
+        }
+#endif
+
         /// <summary>
         /// Get components in children of a specific type in the hierarchy of a GameObject.
         /// </summary>
@@ -184,7 +211,7 @@ namespace Coffee.UIParticleInternal
         /// <summary>
         /// Verify whether it can be converted to the specified component.
         /// </summary>
-            internal static bool CanConvertTo<T>(this Object context) where T : MonoBehaviour
+        internal static bool CanConvertTo<T>(this Object context) where T : MonoBehaviour
         {
             return context != null && context.GetType() != typeof(T);
         }

Packages/src/Runtime/Internal/ProjectSettings/PreloadedProjectSettings.cs

@@ -14,6 +14,15 @@ namespace Coffee.UIParticleInternal
     public abstract class PreloadedProjectSettings : ScriptableObject
 #if UNITY_EDITOR
     {
+        [Tooltip("When enabled, this settings asset will be added to PlayerSettings.preloadedAssets in build.\n\n" +
+                 "When disable, you should load this settings via Resources, AssetBundles or Addressables to use.")]
+        [SerializeField]
+        [Header("Advanced")]
+        [HideInInspector]
+        private bool m_PreLoadSettingsInBuild = true;
+
+        protected static bool s_BuildingPlayer;
+
         private class Postprocessor : AssetPostprocessor
         {
             private static void OnPostprocessAllAssets(string[] _, string[] __, string[] ___, string[] ____)
@@ -22,12 +31,35 @@ namespace Coffee.UIParticleInternal
             }
         }
 
-        private class PreprocessBuildWithReport : IPreprocessBuildWithReport
+        private class ExcludeFromBuild : IPreprocessBuildWithReport, IPostprocessBuildWithReport
         {
             int IOrderedCallback.callbackOrder => 0;
 
             void IPreprocessBuildWithReport.OnPreprocessBuild(BuildReport report)
             {
+                AssetDatabase.Refresh();
+                Initialize();
+                s_BuildingPlayer = true;
+
+                foreach (var t in TypeCache.GetTypesDerivedFrom(typeof(PreloadedProjectSettings<>)))
+                {
+                    var settings = GetDefaultSettings(t);
+                    if (!settings || settings.m_PreLoadSettingsInBuild) continue;
+
+                    PlayerSettings.SetPreloadedAssets(
+                        PlayerSettings.GetPreloadedAssets()
+                            .Where(x => x && x.GetType() != t)
+                            .ToArray());
+
+                    Debug.Log($"[PreloadedProjectSettings] Build started: removed '{settings.name}' " +
+                              $"({t.Name}) from PreloadedAssets. " +
+                              $"It will be restored after build completes.");
+                }
+            }
+
+            void IPostprocessBuildWithReport.OnPostprocessBuild(BuildReport report)
+            {
+                s_BuildingPlayer = false;
                 Initialize();
             }
         }
@@ -39,13 +71,16 @@ namespace Coffee.UIParticleInternal
                 var defaultSettings = GetDefaultSettings(t);
                 if (defaultSettings == null)
                 {
-                    // When create a new instance, automatically set it as default settings.
-                    defaultSettings = CreateInstance(t) as PreloadedProjectSettings;
-                    SetDefaultSettings(defaultSettings);
+                    if (!s_BuildingPlayer)
+                    {
+                        // When create a new instance, automatically set it as default settings.
+                        defaultSettings = CreateInstance(t) as PreloadedProjectSettings;
+                        SetDefaultSettings(defaultSettings);
+                    }
                 }
                 else if (GetPreloadedSettings(t).Length != 1)
                 {
-                    SetDefaultSettings(defaultSettings);
+                    if (!s_BuildingPlayer) SetDefaultSettings(defaultSettings);
                 }
 
                 if (defaultSettings != null)
@@ -73,7 +108,7 @@ namespace Coffee.UIParticleInternal
         protected static PreloadedProjectSettings GetDefaultSettings(Type type)
         {
             return GetPreloadedSettings(type).FirstOrDefault() as PreloadedProjectSettings
-                   ?? AssetDatabase.FindAssets($"t:{nameof(PreloadedProjectSettings)}")
+                   ?? AssetDatabase.FindAssets($"t:{type.Name}")
                        .Select(AssetDatabase.GUIDToAssetPath)
                        .Select(AssetDatabase.LoadAssetAtPath<PreloadedProjectSettings>)
                        .FirstOrDefault(x => x != null && x.GetType() == type);
@@ -120,6 +155,35 @@ namespace Coffee.UIParticleInternal
         {
         }
     }
+
+    internal abstract class PreloadedProjectSettingsEditor : Editor
+    {
+        private SerializedProperty _preLoadSettingsInBuild;
+
+        protected virtual void OnEnable()
+        {
+            _preLoadSettingsInBuild = serializedObject.FindProperty("m_PreLoadSettingsInBuild");
+        }
+
+        protected void DrawPreLoadSettingsInBuild(string packageName)
+        {
+            EditorGUILayout.PropertyField(_preLoadSettingsInBuild);
+            if (!_preLoadSettingsInBuild.boolValue)
+            {
+                EditorGUILayout.BeginHorizontal();
+                EditorGUILayout.HelpBox(
+                    $"{target.GetType().Name} asset will not be built in.\n" +
+                    $"please load manually from Resources, AssetBundle, or Addressables before using {packageName}.",
+                    MessageType.Warning);
+                if (GUILayout.Button("Ping"))
+                {
+                    EditorGUIUtility.PingObject(target);
+                }
+
+                EditorGUILayout.EndHorizontal();
+            }
+        }
+    }
 #else
     {
     }
@@ -151,13 +215,15 @@ namespace Coffee.UIParticleInternal
                     return s_Instance;
                 }
 
-                SetDefaultSettings(s_Instance);
+                if (!s_BuildingPlayer) SetDefaultSettings(s_Instance);
                 return s_Instance;
             }
         }
 
         private void OnPlayModeStateChanged(PlayModeStateChange state)
         {
+            if (!this) return;
+
             switch (state)
             {
                 case PlayModeStateChange.ExitingEditMode:
@@ -191,9 +257,12 @@ namespace Coffee.UIParticleInternal
             }
 
             EditorApplication.playModeStateChanged += OnPlayModeStateChanged;
+#else
+            if (s_Instance && s_Instance != this)
+            {
+                Destroy(s_Instance);
+            }
 #endif
-
-            if (s_Instance != null) return;
             s_Instance = this as T;
         }
 

Packages/src/Runtime/Internal/Utilities/FrameCache.cs

@@ -14,7 +14,7 @@ namespace Coffee.UIParticleInternal
             UIExtraCallbacks.onLateAfterCanvasRebuild += ClearAllCache;
         }
 
-#if UNITY_EDITOR
+#if UNITY_EDITOR && UNITY_2019_2_OR_NEWER
         [RuntimeInitializeOnLoadMethod(RuntimeInitializeLoadType.SubsystemRegistration)]
         private static void Clear()
         {

Packages/src/Runtime/Internal/Utilities/Logger.cs

@@ -11,7 +11,7 @@ using Conditional = System.Diagnostics.ConditionalAttribute;
 
 namespace Coffee.UIParticleInternal
 {
-    internal static class Logging
+    internal static class Logger
     {
 #if !ENABLE_COFFEE_LOGGER
         private const string k_DisableSymbol = "DISABLE_COFFEE_LOGGER";

Packages/src/Runtime/Internal/Utilities/Logger.cs.meta

@@ -1,5 +1,5 @@
 fileFormatVersion: 2
-guid: 8255313895da84e7cbdc876be3795334
+guid: 4f9f22bb079324476b1473030ad9fec3
 MonoImporter:
   externalObjects: {}
   serializedVersion: 2

Packages/src/Runtime/Internal/Utilities/MaterialRepository.cs

@@ -13,7 +13,9 @@ namespace Coffee.UIParticleInternal
 
         public static int count => s_Repository.count;
 
-#if UNITY_EDITOR
+        public static Func<string, Shader> onShaderFind = Shader.Find;
+
+#if UNITY_EDITOR && UNITY_2019_2_OR_NEWER
         [RuntimeInitializeOnLoadMethod(RuntimeInitializeLoadType.SubsystemRegistration)]
         public static void Clear()
         {
@@ -48,7 +50,7 @@ namespace Coffee.UIParticleInternal
         public static void Get(Hash128 hash, ref Material material, string shaderName)
         {
             Profiler.BeginSample("(COF)[MaterialRepository] Get");
-            s_Repository.Get(hash, ref material, x => new Material(Shader.Find(x))
+            s_Repository.Get(hash, ref material, x => new Material(onShaderFind(x))
             {
                 hideFlags = HideFlags.DontSave | HideFlags.NotEditable
             }, shaderName);
@@ -61,7 +63,7 @@ namespace Coffee.UIParticleInternal
         public static void Get(Hash128 hash, ref Material material, string shaderName, string[] keywords)
         {
             Profiler.BeginSample("(COF)[MaterialRepository] Get");
-            s_Repository.Get(hash, ref material, x => new Material(Shader.Find(x.shaderName))
+            s_Repository.Get(hash, ref material, x => new Material(onShaderFind(x.shaderName))
             {
                 hideFlags = HideFlags.DontSave | HideFlags.NotEditable,
                 shaderKeywords = x.keywords

Packages/src/Runtime/Internal/Utilities/Misc.cs

@@ -20,7 +20,9 @@ namespace Coffee.UIParticleInternal
     {
         public static T[] FindObjectsOfType<T>() where T : Object
         {
-#if UNITY_2023_1_OR_NEWER
+#if UNITY_6000_4_OR_NEWER
+            return Object.FindObjectsByType<T>(FindObjectsInactive.Include);
+#elif UNITY_2023_1_OR_NEWER
             return Object.FindObjectsByType<T>(FindObjectsInactive.Include, FindObjectsSortMode.None);
 #else
             return Object.FindObjectsOfType<T>();
@@ -46,15 +48,10 @@ namespace Coffee.UIParticleInternal
         {
             if (obj == null) return;
 #if UNITY_EDITOR
-            if (Application.isEditor)
-            {
-                Object.DestroyImmediate(obj);
-            }
-            else
+            Object.DestroyImmediate(obj, true);
+#else
+            Object.Destroy(obj);
 #endif
-            {
-                Object.Destroy(obj);
-            }
         }
 
         [Conditional("UNITY_EDITOR")]
@@ -112,7 +109,7 @@ namespace Coffee.UIParticleInternal
         {
             if (Misc.isBatchOrBuilding) return;
 
-            var types = TypeCache.GetTypesWithAttribute<IconAttribute>();
+            var types = TypeCache.GetTypesWithAttribute(typeof(IconAttribute));
             var scripts = MonoImporter.GetAllRuntimeMonoScripts();
             foreach (var type in types)
             {

Packages/src/Runtime/Internal/Utilities/ObjectPool.cs

@@ -34,7 +34,7 @@ namespace Coffee.UIParticleInternal
             }
 
             // If there are no instances in the pool, create a new one.
-            Logging.Log(this, $"A new instance is created (pooled: {_pool.CountInactive}, created: {_pool.CountAll}).");
+            Logger.Log(this, $"A new instance is created (pooled: {_pool.CountInactive}, created: {_pool.CountAll}).");
             return _pool.Get();
         }
 
@@ -47,7 +47,7 @@ namespace Coffee.UIParticleInternal
             if (instance == null) return; // Ignore if already pooled or null.
 
             _pool.Release(instance);
-            Logging.Log(this, $"An instance is released (pooled: {_pool.CountInactive}, created: {_pool.CountAll}).");
+            Logger.Log(this, $"An instance is released (pooled: {_pool.CountInactive}, created: {_pool.CountAll}).");
             instance = default; // Set the reference to null.
         }
 #else
@@ -80,7 +80,7 @@ namespace Coffee.UIParticleInternal
             }
 
             // If there are no instances in the pool, create a new one.
-            Logging.Log(this, $"A new instance is created (pooled: {_pool.Count}, created: {++_count}).");
+            Logger.Log(this, $"A new instance is created (pooled: {_pool.Count}, created: {++_count}).");
             return _onCreate();
         }
 
@@ -94,7 +94,7 @@ namespace Coffee.UIParticleInternal
 
             _onReturn(instance); // Return the instance to the pool.
             _pool.Push(instance);
-            Logging.Log(this, $"An instance is released (pooled: {_pool.Count}, created: {_count}).");
+            Logger.Log(this, $"An instance is released (pooled: {_pool.Count}, created: {_count}).");
             instance = default; // Set the reference to null.
         }
 #endif

Packages/src/Runtime/Internal/Utilities/ObjectRepository.cs

@@ -103,7 +103,7 @@ namespace Coffee.UIParticleInternal
                     Release(ref obj);
                     ++entry.reference;
                     obj = entry.storedObject;
-                    Logging.Log(_name, $"Get(total#{count}): {entry}");
+                    Logger.Log(_name, $"Get(total#{count}): {entry}");
                 }
 
                 Profiler.EndSample();
@@ -130,8 +130,8 @@ namespace Coffee.UIParticleInternal
             newEntry.hash = hash;
             newEntry.reference = 1;
             _cache[hash] = newEntry;
-            _objectKey[newObject.GetInstanceID()] = hash;
-            Logging.Log(_name, $"<color=#03c700>Add</color>(total#{count}): {newEntry}");
+            _objectKey[newObject.GetHashCode()] = hash;
+            Logger.Log(_name, $"<color=#03c700>Add</color>(total#{count}): {newEntry}");
             Release(ref obj);
             obj = newObject;
             Profiler.EndSample();
@@ -146,7 +146,7 @@ namespace Coffee.UIParticleInternal
 
             // Find and release the entry.
             Profiler.BeginSample("(COF)[ObjectRepository] Release");
-            var id = obj.GetInstanceID();
+            var id = obj.GetHashCode();
             if (_objectKey.TryGetValue(id, out var hash)
                 && _cache.TryGetValue(hash, out var entry))
             {
@@ -157,12 +157,12 @@ namespace Coffee.UIParticleInternal
                 }
                 else
                 {
-                    Logging.Log(_name, $"Release(total#{_cache.Count}): {entry}");
+                    Logger.Log(_name, $"Release(total#{_cache.Count}): {entry}");
                 }
             }
             else
             {
-                Logging.Log(_name, $"Release(total#{_cache.Count}): <color=red>Already released: {obj}</color>");
+                Logger.Log(_name, $"Release(total#{_cache.Count}): <color=red>Already released: {obj}</color>");
             }
 
             obj = null;
@@ -175,10 +175,10 @@ namespace Coffee.UIParticleInternal
 
             Profiler.BeginSample("(COF)[ObjectRepository] Remove");
             _cache.Remove(entry.hash);
-            _objectKey.Remove(entry.storedObject.GetInstanceID());
+            _objectKey.Remove(entry.storedObject.GetHashCode());
             _pool.Push(entry);
             entry.reference = 0;
-            Logging.Log(_name, $"<color=#f29e03>Remove</color>(total#{_cache.Count}): {entry}");
+            Logger.Log(_name, $"<color=#f29e03>Remove</color>(total#{_cache.Count}): {entry}");
             entry.Release(_onRelease);
             Profiler.EndSample();
         }

Packages/src/Runtime/Internal/Utilities/TypeCache.cs

@@ -0,0 +1,88 @@
+#if !UNITY_2019_2_OR_NEWER
+using System;
+using System.Collections.Generic;
+using System.Reflection;
+
+namespace Coffee.UIParticleInternal
+{
+    public static class TypeCache
+    {
+        private static readonly object s_Lock = new object();
+        private static readonly Dictionary<Type, Type[]> s_DerivedTypesCache = new Dictionary<Type, Type[]>();
+        private static readonly Dictionary<Type, Type[]> s_AttributeTypesCache = new Dictionary<Type, Type[]>();
+
+        public static IEnumerable<Type> GetTypesDerivedFrom(Type baseType)
+        {
+            lock (s_Lock)
+            {
+                if (s_DerivedTypesCache.TryGetValue(baseType, out var cached))
+                {
+                    return cached;
+                }
+
+                var types = new List<Type>();
+                foreach (var t in GetAllLoadableTypes())
+                {
+                    if (t != baseType && baseType.IsAssignableFrom(t))
+                    {
+                        types.Add(t);
+                    }
+                }
+
+                return s_DerivedTypesCache[baseType] = types.ToArray();
+            }
+        }
+
+        public static IEnumerable<Type> GetTypesWithAttribute(Type attr)
+        {
+            lock (s_Lock)
+            {
+                if (s_AttributeTypesCache.TryGetValue(attr, out var cached))
+                {
+                    return cached;
+                }
+
+                var types = new List<Type>();
+                foreach (var t in GetAllLoadableTypes())
+                {
+                    if (t.GetCustomAttributes(attr, inherit: true).Length > 0)
+                    {
+                        types.Add(t);
+                    }
+                }
+
+                return s_AttributeTypesCache[attr] = types.ToArray();
+            }
+        }
+
+        private static IEnumerable<Type> GetAllLoadableTypes()
+        {
+            foreach (var assembly in AppDomain.CurrentDomain.GetAssemblies())
+            {
+                Type[] types;
+                try
+                {
+                    types = assembly.GetTypes();
+                }
+                catch (ReflectionTypeLoadException ex)
+                {
+                    types = ex.Types;
+                }
+
+                if (types == null)
+                {
+                    continue;
+                }
+
+                foreach (var t in types)
+                {
+                    if (t != null)
+                    {
+                        yield return t;
+                    }
+                }
+            }
+        }
+    }
+}
+#endif

Packages/src/Runtime/Internal/Utilities/TypeCache.cs.meta

@@ -0,0 +1,11 @@
+fileFormatVersion: 2
+guid: bc1207b657ed74ec19e459664d06925f
+MonoImporter:
+  externalObjects: {}
+  serializedVersion: 2
+  defaultReferences: []
+  executionOrder: 0
+  icon: {instanceID: 0}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 

Packages/src/Runtime/Internal/Utilities/UIExtraCallbacks.cs

@@ -1,4 +1,5 @@
 using System;
+using System.Reflection;
 using UnityEditor;
 using UnityEngine;
 using UnityEngine.UI;
@@ -20,7 +21,7 @@ namespace Coffee.UIParticleInternal
         static UIExtraCallbacks()
         {
             Canvas.willRenderCanvases += OnBeforeCanvasRebuild;
-            Logging.LogMulticast(typeof(Canvas), "willRenderCanvases", message: "ctor");
+            Logger.LogMulticast(typeof(Canvas), "willRenderCanvases", message: "ctor");
         }
 
         /// <summary>
@@ -67,9 +68,17 @@ namespace Coffee.UIParticleInternal
             if (s_IsInitializedAfterCanvasRebuild) return;
             s_IsInitializedAfterCanvasRebuild = true;
 
+            // Explicitly set `Canvas.willRenderCanvases += CanvasUpdateRegistry.PerformUpdate`.
             CanvasUpdateRegistry.IsRebuildingLayout();
+#if TMP_ENABLE
+            // Explicitly set `Canvas.willRenderCanvases += TMP_UpdateManager.DoRebuilds`.
+            typeof(TMPro.TMP_UpdateManager)
+                .GetProperty("instance", BindingFlags.NonPublic | BindingFlags.Static)
+                .GetValue(null);
+#endif
+            Canvas.willRenderCanvases -= OnAfterCanvasRebuild;
             Canvas.willRenderCanvases += OnAfterCanvasRebuild;
-            Logging.LogMulticast(typeof(Canvas), "willRenderCanvases",
+            Logger.LogMulticast(typeof(Canvas), "willRenderCanvases",
                 message: "InitializeAfterCanvasRebuild");
         }
 

Packages/src/Runtime/ParticleSystemPreviewer.cs

@@ -0,0 +1,222 @@
+using System.Collections.Generic;
+using System.Linq;
+using Coffee.UIParticleInternal;
+using UnityEditor;
+using UnityEngine;
+
+namespace Coffee.UIExtensions
+{
+    [Icon("Packages/com.coffee.ui-particle/Editor/UIParticleIcon.png")]
+    [ExecuteAlways]
+    internal class ParticleSystemPreviewer : MonoBehaviour
+    {
+        // Do nothing.
+    }
+
+#if UNITY_EDITOR
+    [CustomEditor(typeof(ParticleSystemPreviewer))]
+    [CanEditMultipleObjects]
+    internal class ParticleSystemPreviewerEditor : Editor
+    {
+        private GameObject[] _gameObjects;
+
+        private void OnEnable()
+        {
+            _gameObjects = targets.OfType<ParticleSystemPreviewer>().Select(x => x.gameObject).ToArray();
+            ParticleSystemPreviewSystem.Register(_gameObjects);
+
+        }
+
+        public override void OnInspectorGUI()
+        {
+            base.OnInspectorGUI();
+            ParticleSystemPreviewSystem.DrawWarningForTemporary(_gameObjects);
+            ParticleSystemPreviewSystem.DrawWarningForPermanent(_gameObjects);
+        }
+    }
+
+    /// <summary>
+    /// This class manages temporary ParticleSystems for preview purposes.
+    /// When previewing in the editor, it is common to place an empty ParticleSystem as the root, but it consumes memory at runtime if included in the build.
+    /// The temporary ParticleSystems created by this class only exist when the specified GameObject is selected, and are automatically deleted when the selection is cleared.
+    /// </summary>
+    internal class ParticleSystemPreviewSystem : ScriptableSingleton<ParticleSystemPreviewSystem>
+    {
+        private const HideFlags k_TemporaryHideFlags = HideFlags.DontSave | HideFlags.NotEditable;
+
+        [SerializeField]
+        private List<GameObject> m_PreviewObjects = new List<GameObject>();
+
+        /// <summary>
+        /// Adds a temporary ParticleSystem to the specified GameObject for preview purposes.
+        /// </summary>
+        public static void Register(GameObject[] targets)
+        {
+            foreach (var target in targets)
+            {
+                Register(target);
+            }
+        }
+
+        /// <summary>
+        /// Adds a temporary ParticleSystem to the specified GameObject for preview purposes.
+        /// </summary>
+        public static void Register(GameObject target)
+        {
+            if (!target) return;
+            if (EditorApplication.isPlaying) return;
+            if (instance.m_PreviewObjects.Contains(target)) return;
+            if (target.TryGetComponent<ParticleSystem>(out var _)) return;
+
+            // Create temporary ParticleSystem for preview.
+            var ps = target.AddComponent<ParticleSystem>();
+            ps.hideFlags = k_TemporaryHideFlags;
+
+            var emission = ps.emission;
+            emission.enabled = false;
+            var shape = ps.shape;
+            shape.enabled = false;
+
+            if (target.TryGetComponent<ParticleSystemRenderer>(out var psr))
+            {
+                psr.enabled = false;
+                psr.hideFlags = k_TemporaryHideFlags;
+            }
+
+            instance.m_PreviewObjects.Add(target);
+            EditorUtility.SetDirty(target);
+        }
+
+        /// <summary>
+        /// Removes the temporary ParticleSystem associated with the specified GameObject.
+        /// </summary>
+        /// <param name="target"></param>
+        public static void Unregister(GameObject target)
+        {
+            if (!target) return;
+
+            var index = instance.m_PreviewObjects.IndexOf(target);
+            if (index < 0) return;
+
+            instance.m_PreviewObjects.RemoveAt(index);
+            if (HasTemporaryParticleSystem(target))
+            {
+                RemoveParticleSystem(target);
+            }
+        }
+
+        /// <summary>
+        /// Removes the temporary ParticleSystem associated with the specified GameObject.
+        /// </summary>
+        /// <param name="target"></param>
+        private static void RemoveParticleSystem(GameObject target)
+        {
+            if (target.TryGetComponent<ParticleSystem>(out var ps))
+            {
+                Misc.DestroyImmediate(ps);
+                EditorUtility.SetDirty(target);
+            }
+
+            if (target.TryGetComponent<ParticleSystem>(out var psr))
+            {
+                Misc.DestroyImmediate(psr);
+                EditorUtility.SetDirty(target);
+            }
+        }
+
+        /// <summary>
+        /// Checks if the specified GameObject has a temporary ParticleSystem.
+        /// </summary>
+        private static bool HasTemporaryParticleSystem(GameObject target)
+        {
+            return target
+                   && instance.m_PreviewObjects.Contains(target)
+                   && target.TryGetComponent<ParticleSystem>(out var ps)
+                   && ps.hideFlags == k_TemporaryHideFlags;
+        }
+
+        /// <summary>
+        /// Checks if the specified GameObject has a permanent ParticleSystem.
+        /// </summary>
+        private static bool HasPermanentParticleSystem(GameObject target)
+        {
+            return target
+                   && target.TryGetComponent<ParticleSystem>(out var ps)
+                   && ps.hideFlags != k_TemporaryHideFlags;
+        }
+
+        private void OnEnable()
+        {
+            Selection.selectionChanged -= OnSelectionChanged;
+            Selection.selectionChanged += OnSelectionChanged;
+        }
+
+        private void OnDisable()
+        {
+            Selection.selectionChanged -= OnSelectionChanged;
+        }
+
+        private void OnSelectionChanged()
+        {
+            var selectedGameObjects = Selection.gameObjects;
+            for (var i = m_PreviewObjects.Count - 1; 0 <= i; i--)
+            {
+                var go = m_PreviewObjects[i];
+                if (!go)
+                {
+                    m_PreviewObjects.RemoveAt(i);
+                }
+                else if (!selectedGameObjects.Contains(go))
+                {
+                    Unregister(go);
+                }
+            }
+        }
+
+        public static void DrawWarningForTemporary(GameObject[] gameObjects)
+        {
+            if (gameObjects == null || gameObjects.Length == 0 || !gameObjects.Any(HasTemporaryParticleSystem)) return;
+
+            if (WarningButton("The temporary ParticleSystem for preview is attached.\n" +
+                              "It will be removed when exiting edit mode.", "Remove"))
+            {
+                foreach (var go in gameObjects)
+                {
+                    if (HasTemporaryParticleSystem(go))
+                    {
+                        RemoveParticleSystem(go);
+                    }
+                }
+            }
+        }
+
+        public static void DrawWarningForPermanent(GameObject[] gameObjects)
+        {
+            if (gameObjects == null || gameObjects.Length == 0 || !gameObjects.Any(HasPermanentParticleSystem)) return;
+
+            if (WarningButton("The permanent ParticleSystem is attached.\n" +
+                              "It will be included in build.", "Remove"))
+            {
+                foreach (var go in gameObjects)
+                {
+                    if (HasPermanentParticleSystem(go))
+                    {
+                        RemoveParticleSystem(go);
+                        Unregister(go);
+                        Register(go);
+                    }
+                }
+            }
+        }
+
+        private static bool WarningButton(string message, string buttonText)
+        {
+            EditorGUILayout.BeginHorizontal();
+            EditorGUILayout.HelpBox(message, MessageType.Warning, true);
+            var clicked = GUILayout.Button(EditorGUIUtility.TrTempContent(buttonText));
+            EditorGUILayout.EndHorizontal();
+            return clicked;
+        }
+    }
+#endif
+}

Packages/src/Runtime/ParticleSystemPreviewer.cs.meta

@@ -0,0 +1,11 @@
+fileFormatVersion: 2
+guid: b171deb49fb7b471291108ad7e1c9baa
+MonoImporter:
+  externalObjects: {}
+  serializedVersion: 2
+  defaultReferences: []
+  executionOrder: 0
+  icon: {instanceID: 0}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 

Packages/src/Runtime/UIParticle.cs

@@ -358,6 +358,7 @@ namespace Coffee.UIExtensions
 
             _isScaleStored = false;
             UIParticleUpdater.Unregister(this);
+            _renderers.RemoveAll(r => r == null);
             _renderers.ForEach(r => r.Reset());
             UnregisterDirtyMaterialCallback(UpdateRendererMaterial);
 
@@ -543,7 +544,12 @@ namespace Coffee.UIExtensions
             for (var i = particles.Count - 1; 0 <= i; i--)
             {
                 var ps = particles[i];
-                if (!ps || ps.GetComponentInParent<UIParticle>(true) != this)
+                if (!ps
+#if UNITY_EDITOR
+                    || ps.hideFlags == HideFlags.HideAndDontSave // Dummy ParticleSystems for preview.
+                    || ps.gameObject.CompareTag("EditorOnly") // Ignore "EditorOnly" tagged ParticleSystems.
+#endif
+                    || ps.GetComponentInParent<UIParticle>(true) != this) // Ignore ParticleSystems that are not under this UIParticle.
                 {
                     particles.RemoveAt(i);
                 }

Packages/src/Runtime/UIParticleProjectSettings.cs

@@ -2,6 +2,7 @@
 using Coffee.UIParticleInternal;
 using UnityEditor;
 using UnityEngine;
+using UnityEngine.Serialization;
 
 namespace Coffee.UIExtensions
 {
@@ -9,12 +10,14 @@ namespace Coffee.UIExtensions
     {
         [Header("Setting")]
         [SerializeField]
-        internal bool m_EnableLinearToGamma = true;
+        [Tooltip("Automatically correct the color space of the mesh.")]
+        [FormerlySerializedAs("m_EnableLinearToGamma")]
+        internal bool m_AutoColorCorrection = true;
 
-        public static bool enableLinearToGamma
+        public static bool autoColorCorrection
         {
-            get => instance.m_EnableLinearToGamma;
-            set => instance.m_EnableLinearToGamma = value;
+            get => instance.m_AutoColorCorrection;
+            set => instance.m_AutoColorCorrection = value;
         }
 
 
@@ -25,10 +28,16 @@ namespace Coffee.UIExtensions
         [SerializeField]
         private bool m_HideGeneratedObjects = true;
 
-        public static HideFlags globalHideFlags => instance.m_HideGeneratedObjects
+        [Tooltip("When selecting UIParticle, a temporary ParticleSystem is generated for preview.")]
+        [SerializeField]
+        private bool m_PreviewOnSelect = true;
+
+        internal static HideFlags globalHideFlags => instance.m_HideGeneratedObjects
             ? HideFlags.DontSave | HideFlags.NotEditable | HideFlags.HideInHierarchy | HideFlags.HideInInspector
             : HideFlags.DontSave | HideFlags.NotEditable;
 
+        internal static bool s_PreviewOnSelectOnSelect => instance.m_PreviewOnSelect;
+
 #if UNITY_EDITOR
         [SettingsProvider]
         private static SettingsProvider CreateSettingsProvider()

Packages/src/Runtime/UIParticleRenderer.cs

@@ -30,6 +30,7 @@ namespace Coffee.UIExtensions
         private int _index;
         private bool _isPrevStored;
         private bool _isTrail;
+        private bool _meshCleared;
         private Bounds _lastBounds;
         private Material _materialForRendering;
         private Material _modifiedMaterial;
@@ -205,9 +206,9 @@ namespace Coffee.UIExtensions
             }
 
             var hash = new Hash128(
-                modifiedMaterial ? (uint)modifiedMaterial.GetInstanceID() : 0,
-                texture ? (uint)texture.GetInstanceID() : 0,
-                0 < _parent.m_AnimatableProperties.Length ? (uint)GetInstanceID() : 0,
+                modifiedMaterial ? (uint)modifiedMaterial.GetHashCode() : 0,
+                texture ? (uint)texture.GetHashCode() : 0,
+                0 < _parent.m_AnimatableProperties.Length ? (uint)GetHashCode() : 0,
 #if UNITY_EDITOR
                 (uint)EditorJsonUtility.ToJson(modifiedMaterial).GetHashCode()
 #else
@@ -285,10 +286,14 @@ namespace Coffee.UIExtensions
                 || (_isTrail && !_particleSystem.trails.enabled) // Trail, but it is not enabled.
             )
             {
+                // Skip clearing the mesh if it's already cleared.
+                if (_meshCleared) return;
+
                 Profiler.BeginSample("[UIParticleRenderer] Clear Mesh");
                 workerMesh.Clear();
                 canvasRenderer.SetMesh(workerMesh);
                 _lastBounds = new Bounds();
+                _meshCleared = true;
                 Profiler.EndSample();
 
                 return;
@@ -312,6 +317,7 @@ namespace Coffee.UIExtensions
             //     customData.SetVector(ParticleSystemCustomData.Custom2, 3, 0);
             // }
 
+            _meshCleared = false;
             var main = _particleSystem.main;
             var scale = GetWorldScale();
             var psPos = _particleSystem.transform.position;
@@ -438,7 +444,7 @@ namespace Coffee.UIExtensions
                 _lastBounds = bounds;
 
                 // Convert linear color to gamma color.
-                if (UIParticleProjectSettings.enableLinearToGamma && canvas.ShouldGammaToLinearInMesh())
+                if (UIParticleProjectSettings.autoColorCorrection && canvas.ShouldGammaToLinearInMesh())
                 {
                     workerMesh.LinearToGamma();
                 }

Packages/src/Runtime/Utilities/ParticleSystemExtensions.cs

@@ -92,7 +92,7 @@ namespace Coffee.UIParticleInternal
 
                 if (sortByMaterial)
                 {
-                    return aMat.GetInstanceID() - bMat.GetInstanceID();
+                    return aMat.GetHashCode() - bMat.GetHashCode();
                 }
 
                 if (aMat.renderQueue != bMat.renderQueue)
@@ -131,7 +131,7 @@ namespace Coffee.UIParticleInternal
         {
             for (var i = 0; i < list.Count; i++)
             {
-                if (list[i].GetInstanceID() == ps.GetInstanceID())
+                if (list[i].GetHashCode() == ps.GetHashCode())
                 {
                     return i;
                 }

Packages/src/Shaders/UIAdditive.shader

@@ -40,12 +40,8 @@
         Lighting Off
         ZWrite Off
         ZTest [unity_GUIZTestMode]
-        Fog
-        {
-            Mode Off
-        }
+        Fog { Mode Off }
         Blend One One
-
         ColorMask [_ColorMask]
 
         Pass
@@ -76,6 +72,7 @@
                 fixed4 color : COLOR;
                 float2 texcoord : TEXCOORD0;
                 float4 worldPosition : TEXCOORD1;
+                float4 mask : TEXCOORD2;
                 UNITY_VERTEX_OUTPUT_STEREO
             };
 
@@ -84,16 +81,43 @@
             float4 _MainTex_ST;
             fixed4 _TextureSampleAdd;
             float4 _ClipRect;
+            float _UIMaskSoftnessX;
+            float _UIMaskSoftnessY;
+            int _UIVertexColorAlwaysGammaSpace;
+
+            half3 _UIGammaToLinear(half3 value)
+            {
+                half3 low = 0.0849710 * value - 0.000163029;
+                half3 high = value * (value * (value * 0.265885 + 0.736584) - 0.00980184) + 0.00319697;
+
+                // We should be 0.5 away from any actual gamma value stored in an 8 bit channel
+                const half3 split = (half3)0.0725490; // Equals 18.5 / 255
+                return (value < split) ? low : high;
+            }
 
             v2f vert(appdata_t v)
             {
                 v2f OUT;
                 UNITY_SETUP_INSTANCE_ID(v);
                 UNITY_INITIALIZE_VERTEX_OUTPUT_STEREO(OUT);
+                float4 vPosition = UnityObjectToClipPos(v.vertex);
                 OUT.worldPosition = v.vertex;
-                OUT.vertex = UnityObjectToClipPos(OUT.worldPosition);
+                OUT.vertex = vPosition;
 
-                OUT.texcoord = TRANSFORM_TEX(v.texcoord, _MainTex);
+                float2 pixelSize = vPosition.w;
+                pixelSize /= float2(1, 1) * abs(mul((float2x2)UNITY_MATRIX_P, _ScreenParams.xy));
+
+                float4 clampedRect = clamp(_ClipRect, -2e10, 2e10);
+                float2 maskUV = (v.vertex.xy - clampedRect.xy) / (clampedRect.zw - clampedRect.xy);
+                OUT.texcoord = TRANSFORM_TEX(v.texcoord.xy, _MainTex);
+                OUT.mask = float4(v.vertex.xy * 2 - clampedRect.xy - clampedRect.zw, 0.25 / (0.25 * half2(_UIMaskSoftnessX, _UIMaskSoftnessY) + abs(pixelSize.xy)));
+
+                if (_UIVertexColorAlwaysGammaSpace)
+                {
+                    #ifndef UNITY_COLORSPACE_GAMMA
+                    v.color.rgb = _UIGammaToLinear(v.color.rgb);
+                    #endif
+                }
 
                 OUT.color = v.color * _Color;
                 return OUT;
@@ -101,17 +125,26 @@
 
             fixed4 frag(v2f IN) : SV_Target
             {
-                half4 color = (tex2D(_MainTex, IN.texcoord) + _TextureSampleAdd) * IN.color;
+                //Round up the alpha color coming from the interpolator (to 1.0/256.0 steps)
+                //The incoming alpha could have numerical instability, which makes it very sensible to
+                //HDR color transparency blend, when it blends with the world's texture.
+                const half alphaPrecision = half(0xff);
+                const half invAlphaPrecision = half(1.0 / alphaPrecision);
+                IN.color.a = round(IN.color.a * alphaPrecision) * invAlphaPrecision;
+
+                half4 color = IN.color * (tex2D(_MainTex, IN.texcoord) + _TextureSampleAdd);
 
                 #ifdef UNITY_UI_CLIP_RECT
-                    color.a *= UnityGet2DClipping(IN.worldPosition.xy, _ClipRect);
+                half2 m = saturate((_ClipRect.zw - _ClipRect.xy - abs(IN.mask.xy)) * IN.mask.zw);
+                color.a *= m.x * m.y;
                 #endif
 
                 #ifdef UNITY_UI_ALPHACLIP
-                    clip (color.a - 0.001);
+                clip(color.a - 0.001);
                 #endif
 
                 color.rgb *= color.a;
+
                 return color;
             }
             ENDCG

Packages/src/package.json

@@ -2,7 +2,7 @@
   "name": "com.coffee.ui-particle",
   "displayName": "UI Particle",
   "description": "This package provides a component to render particle effects for uGUI.\nThe particle rendering is maskable and sortable, without the need for an extra Camera, RenderTexture, or Canvas.",
-  "version": "4.12.0",
+  "version": "4.12.2",
   "unity": "2018.2",
   "license": "MIT",
   "repository": {