chore(release): 4.12.1 [skip ci]

## [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](031d46a321))
fix: ignore "EditorOnly" tagged gameObjects on refresh
2026-05-14 20:20:06 +00:00 · 2026-03-24 08:53:33 +00:00 · 2026-03-24 17:53:01 +09:00 · 2026-03-24 08:34:58 +00:00 · 2026-03-24 17:32:31 +09:00 · 2025-12-24 11:17:10 +00:00
34 changed files with 689 additions and 348 deletions
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,107 @@
+## [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)
+
+
+### Features
+
+* explicit null checks ([5384f61](https://github.com/mob-sakai/ParticleEffectForUGUI/commit/5384f61c569e9f78ff9d5b45acfc6f5c2f021a87))
+
+## [4.11.4](https://github.com/mob-sakai/ParticleEffectForUGUI/compare/v4.11.3...v4.11.4) (2025-12-24)
+
+
+### Bug Fixes
+
+* add early return for case where subEmitter module is disabled ([d1386a1](https://github.com/mob-sakai/ParticleEffectForUGUI/commit/d1386a12216743a6e09f1b9b87bea1dfcf7702e4))
+* avoid endless loop ([eb2e862](https://github.com/mob-sakai/ParticleEffectForUGUI/commit/eb2e862e80e549c8cf16ddfed776c101c2413bac)), closes [#392](https://github.com/mob-sakai/ParticleEffectForUGUI/issues/392)
+
+## [4.11.3](https://github.com/mob-sakai/ParticleEffectForUGUI/compare/v4.11.2...v4.11.3) (2025-10-14)
+
+
+### Bug Fixes
+
+* fix icon ([a9461ec](https://github.com/mob-sakai/ParticleEffectForUGUI/commit/a9461ecb4d40d7fe878e12465d6e38faae7ae65b))
+* fix URL link in README ([1c8c65d](https://github.com/mob-sakai/ParticleEffectForUGUI/commit/1c8c65d25e7f6fe7b1d20da4461333df8fc7578e)), closes [#376](https://github.com/mob-sakai/ParticleEffectForUGUI/issues/376)
+* fix: second and subsequent bursts not displayed when world simulation and non-looping ([df2f3ca](https://github.com/mob-sakai/ParticleEffectForUGUI/commit/df2f3caafbe279f1457d74f8183cb561ac14aa17)), closes [#326](https://github.com/mob-sakai/ParticleEffectForUGUI/issues/326)
+* UIParticle in canvas with 0f-0.01f alpha value does not start to play until alpha value is greater than 0.01f, causes play calls to be delayed unintentionally if canvas alpha value is set to mentioned value range ([38aec2e](https://github.com/mob-sakai/ParticleEffectForUGUI/commit/38aec2ea1afd77677d629c86665a3342d92e49d9))
+
+## [4.11.2](https://github.com/mob-sakai/ParticleEffectForUGUI/compare/v4.11.1...v4.11.2) (2025-03-15)
+
+
+### Bug Fixes
+
+* IL2CPP build fails on older versions of Unity ([0da6525](https://github.com/mob-sakai/ParticleEffectForUGUI/commit/0da652520cd165b43de7404c0b0ab1fbcf9349d1))
+* NRE on enable ([0cff50e](https://github.com/mob-sakai/ParticleEffectForUGUI/commit/0cff50ef696aa53fb7c46a9a737b7cf3a05b7b9b)), closes [#359](https://github.com/mob-sakai/ParticleEffectForUGUI/issues/359)
+
+## [4.11.1](https://github.com/mob-sakai/ParticleEffectForUGUI/compare/v4.11.0...v4.11.1) (2025-02-21)
+
+
+### Bug Fixes
+
+* component icons will no longer be displayed in the scene view ([6dfbdae](https://github.com/mob-sakai/ParticleEffectForUGUI/commit/6dfbdae38d3822ab9c2c6f0e4ca1ca32ee98a239))
+
+# [4.11.0](https://github.com/mob-sakai/ParticleEffectForUGUI/compare/v4.10.7...v4.11.0) (2025-02-21)
+
+
+### Features
+
+* add 'TimeScaleMultiplier' option ([925af0b](https://github.com/mob-sakai/ParticleEffectForUGUI/commit/925af0b6046f65f23a778f67cefa8ff9cbedb513))
+
+## [4.10.7](https://github.com/mob-sakai/ParticleEffectForUGUI/compare/v4.10.6...v4.10.7) (2025-01-14)
+
+
+### Bug Fixes
+
+* editor crashed on exit play mode (editor, windows) ([47ee45c](https://github.com/mob-sakai/ParticleEffectForUGUI/commit/47ee45cbbe651a8f87ca2b8a3948f8b88db8211e)), closes [#351](https://github.com/mob-sakai/ParticleEffectForUGUI/issues/351)
+
+## [4.10.6](https://github.com/mob-sakai/ParticleEffectForUGUI/compare/v4.10.5...v4.10.6) (2025-01-03)
+
+
+### Bug Fixes
+
+* sub-emitter particles may not render correctly in certain scenarios ([8276684](https://github.com/mob-sakai/ParticleEffectForUGUI/commit/8276684c3b1646f0490ed64557547ba15281664a)), closes [#348](https://github.com/mob-sakai/ParticleEffectForUGUI/issues/348)
+* sub-emitter's `inherit velocity` module doubles at runtime ([67de3d1](https://github.com/mob-sakai/ParticleEffectForUGUI/commit/67de3d1bd3e16dc9b564625cb990c53d75769506)), closes [#349](https://github.com/mob-sakai/ParticleEffectForUGUI/issues/349)
+
+## [4.10.5](https://github.com/mob-sakai/ParticleEffectForUGUI/compare/v4.10.4...v4.10.5) (2024-12-23)
+
+
+### Bug Fixes
+
+* '3D' scale toggle in the inspector does not keep on reload ([934f4b8](https://github.com/mob-sakai/ParticleEffectForUGUI/commit/934f4b8f1c61f8ff20228d0ebcea9f636a3758ed)), closes [#346](https://github.com/mob-sakai/ParticleEffectForUGUI/issues/346)
+
+## [4.10.4](https://github.com/mob-sakai/ParticleEffectForUGUI/compare/v4.10.3...v4.10.4) (2024-12-19)
+
+
+### Bug Fixes
+
+* rendering issues when playing with opening a prefab stage ([95235a9](https://github.com/mob-sakai/ParticleEffectForUGUI/commit/95235a929b82cf681365ed6eba837d857f83e3d2)), closes [#345](https://github.com/mob-sakai/ParticleEffectForUGUI/issues/345)
+
+## [4.10.3](https://github.com/mob-sakai/ParticleEffectForUGUI/compare/v4.10.2...v4.10.3) (2024-11-20)
+
+
+### Bug Fixes
+
+* if not configured as a preloaded asset, the project settings asset will be regenerated ([abe0948](https://github.com/mob-sakai/ParticleEffectForUGUI/commit/abe09485f65dd4efd18e74675e752e0213bdf3be)), closes [#342](https://github.com/mob-sakai/ParticleEffectForUGUI/issues/342)
+
+## [4.10.2](https://github.com/mob-sakai/ParticleEffectForUGUI/compare/v4.10.1...v4.10.2) (2024-11-01)
+
+
+### Bug Fixes
+
+* trail incorrect offset ([afe00a1](https://github.com/mob-sakai/ParticleEffectForUGUI/commit/afe00a1dde80eb1c0a7bb668b75f4c3733d3fa43)), closes [#335](https://github.com/mob-sakai/ParticleEffectForUGUI/issues/335)
+
+## [4.10.1](https://github.com/mob-sakai/ParticleEffectForUGUI/compare/v4.10.0...v4.10.1) (2024-09-29)
+
+
+### Bug Fixes
+
+* mainTex will be ignored ([2ee69d0](https://github.com/mob-sakai/ParticleEffectForUGUI/commit/2ee69d04245fabce185f67dc9bd68c870e556564))
+
 # [4.10.0](https://github.com/mob-sakai/ParticleEffectForUGUI/compare/v4.9.1...v4.10.0) (2024-09-29)


--- a/Editor/AnimatablePropertyEditor.cs
+++ b/Editor/AnimatablePropertyEditor.cs
@@ -76,7 +76,7 @@ namespace Coffee.UIExtensions
            for (var j = 0; j < mats.Count; j++)
            {
                var mat = mats[j];
-                if (!mat || !mat.shader) continue;
+                if (mat == null || mat.shader == null) continue;

                for (var i = 0; i < ShaderUtil.GetPropertyCount(mat.shader); i++)
                {
--- a/Editor/UIParticleEditor.cs
+++ b/Editor/UIParticleEditor.cs
@@ -28,6 +28,11 @@ namespace Coffee.UIExtensions
    [CanEditMultipleObjects]
    internal class UIParticleEditor : GraphicEditor
    {
+        internal class State : ScriptableSingleton<State>
+        {
+            public bool is3DScaleMode;
+        }
+
        //################################
        // Constant or Static Members.
        //################################
@@ -46,7 +51,6 @@ namespace Coffee.UIExtensions
        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;
@@ -58,8 +62,10 @@ namespace Coffee.UIExtensions
        private SerializedProperty _autoScalingMode;
        private SerializedProperty _useCustomView;
        private SerializedProperty _customViewSize;
+        private SerializedProperty _timeScaleMultiplier;
        private ReorderableList _ro;
        private bool _showMax;
+        private bool _is3DScaleMode;

        private static readonly HashSet<Shader> s_Shaders = new HashSet<Shader>();
 #if UNITY_2018 || UNITY_2019
@@ -95,6 +101,7 @@ namespace Coffee.UIExtensions
            _autoScalingMode = serializedObject.FindProperty("m_AutoScalingMode");
            _useCustomView = serializedObject.FindProperty("m_UseCustomView");
            _customViewSize = serializedObject.FindProperty("m_CustomViewSize");
+            _timeScaleMultiplier = serializedObject.FindProperty("m_TimeScaleMultiplier");

            var sp = serializedObject.FindProperty("m_Particles");
            _ro = new ReorderableList(sp.serializedObject, sp, true, true, true, true)
@@ -103,7 +110,7 @@ namespace Coffee.UIExtensions
                {
                    var ps = sp.GetArrayElementAtIndex(index).objectReferenceValue as ParticleSystem;
                    var materialCount = 0;
-                    if (ps && ps.TryGetComponent<ParticleSystemRenderer>(out var psr))
+                    if (ps != null && ps.TryGetComponent<ParticleSystemRenderer>(out var psr))
                    {
                        materialCount = psr.sharedMaterials.Length;
                    }
@@ -117,7 +124,7 @@ namespace Coffee.UIExtensions
                    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;
+                    if (ps == null || !ps.TryGetComponent<ParticleSystemRenderer>(out var psr)) return;

                    rect.x += 15;
                    rect.width -= 15;
@@ -163,6 +170,19 @@ namespace Coffee.UIExtensions
                    uip.RefreshParticles(uip.particles);
                }
            }
+
+            // Initialize 3D scale mode.
+            _is3DScaleMode = State.instance.is3DScaleMode;
+            if (!_is3DScaleMode)
+            {
+                var x = _scale3D.FindPropertyRelative("x");
+                var y = _scale3D.FindPropertyRelative("y");
+                var z = _scale3D.FindPropertyRelative("z");
+                _is3DScaleMode = !Mathf.Approximately(x.floatValue, y.floatValue) ||
+                                 !Mathf.Approximately(y.floatValue, z.floatValue) ||
+                                 y.hasMultipleDifferentValues ||
+                                 z.hasMultipleDifferentValues;
+            }
        }

        /// <summary>
@@ -171,7 +191,7 @@ namespace Coffee.UIExtensions
        public override void OnInspectorGUI()
        {
            var current = target as UIParticle;
-            if (!current) return;
+            if (current == null) return;

            Profiler.BeginSample("(UIP:E) OnInspectorGUI");
            serializedObject.Update();
@@ -181,7 +201,11 @@ namespace Coffee.UIExtensions

            // Scale
            EditorGUI.BeginDisabledGroup(!_meshSharing.hasMultipleDifferentValues && _meshSharing.intValue == 4);
-            s_XYZMode = DrawFloatOrVector3Field(_scale3D, s_XYZMode);
+            if (DrawFloatOrVector3Field(_scale3D, _is3DScaleMode) != _is3DScaleMode)
+            {
+                State.instance.is3DScaleMode = _is3DScaleMode = !_is3DScaleMode;
+            }
+
            EditorGUI.EndDisabledGroup();

            // AnimatableProperties
@@ -222,6 +246,9 @@ namespace Coffee.UIExtensions
                _customViewSize.floatValue = Mathf.Max(0.1f, _customViewSize.floatValue);
            }

+            // Time Scale Multiplier
+            EditorGUILayout.PropertyField(_timeScaleMultiplier);
+
            // Target ParticleSystems.
            EditorGUI.BeginChangeCheck();
            _ro.DoLayoutList();
@@ -240,7 +267,7 @@ namespace Coffee.UIExtensions
            Profiler.BeginSample("(UIP:E) Non-UI built-in shader is not supported.");
            foreach (var mat in s_TempMaterials)
            {
-                if (!mat || !mat.shader) continue;
+                if (mat == null || mat.shader == null) continue;
                var shader = mat.shader;
                if (IsBuiltInObject(shader) && !shader.name.StartsWith("UI/"))
                {
@@ -259,7 +286,7 @@ namespace Coffee.UIExtensions
            {
                foreach (var mat in s_TempMaterials)
                {
-                    if (!mat || !mat.shader) continue;
+                    if (mat == null || mat.shader == null) continue;
                    var shader = mat.shader;
                    if (!s_Shaders.Add(shader)) continue;

--- a/Editor/UIParticleIcon.png
+++ b/Editor/UIParticleIcon.png
--- a/Editor/UIParticleIcon.png.meta
+++ b/Editor/UIParticleIcon.png.meta
--- a/Icons.meta
+++ b/Icons.meta
@@ -1,8 +0,0 @@
-fileFormatVersion: 2
-guid: 7a55e246f37df405bac88eac692e3a86
-folderAsset: yes
-DefaultImporter:
-  externalObjects: {}
-  userData: 
-  assetBundleName: 
-  assetBundleVariant: 
--- a/README.md
+++ b/README.md
@@ -144,7 +144,7 @@ _This package requires **Unity 2018.3 or later**._

 #### Install as Embedded Package

-1. Download a source code zip file from [Releases](https://github.com/mob-sakai/ParticleEffectForUGUI.git/releases) and extract it.
+1. Download a source code zip file from [Releases](https://github.com/mob-sakai/ParticleEffectForUGUI/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.
@@ -158,7 +158,7 @@ _This package requires **Unity 2018.3 or later**._

 `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)
+![](https://github.com/user-attachments/assets/bc9eb783-afce-4102-ac61-aee9ea8d6f2f)

 - **Maskable**: Does this graphic allow maskable.
 - **Scale**: Scale the rendering particles. When the `3D` toggle is enabled, 3D scale (x, y, z) is supported.
@@ -180,6 +180,7 @@ _This package requires **Unity 2018.3 or later**._
  - **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.
+- **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
@@ -210,7 +211,7 @@ and z-position.
 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)
+the [How to Make a Custom Shader to Support Mask/RectMask2D Component](#how-to-make-a-custom-shader-to-support-mask-and-rectmask2d-component)
 section.

 ![](https://user-images.githubusercontent.com/12690315/95017591-3b512700-0695-11eb-864e-04166ea1809a.png)
--- a/Runtime/Coffee.UIParticle.R.dll
+++ b/Runtime/Coffee.UIParticle.R.dll
--- a/Runtime/Coffee.UIParticle.R.dll.meta
+++ b/Runtime/Coffee.UIParticle.R.dll.meta
@@ -0,0 +1,33 @@
+fileFormatVersion: 2
+guid: 4d73b3825bf044d418ae21bb331d3902
+PluginImporter:
+  externalObjects: {}
+  serializedVersion: 2
+  iconMap: {}
+  executionOrder: {}
+  defineConstraints: []
+  isPreloaded: 0
+  isOverridable: 1
+  isExplicitlyReferenced: 0
+  validateReferences: 1
+  platformData:
+  - first:
+      Any: 
+    second:
+      enabled: 1
+      settings: {}
+  - first:
+      Editor: Editor
+    second:
+      enabled: 0
+      settings:
+        DefaultValueInitialized: true
+  - first:
+      Windows Store Apps: WindowsStoreApps
+    second:
+      enabled: 0
+      settings:
+        CPU: AnyCPU
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 
--- a/Runtime/Internal/Extensions/ComponentExtensions.cs
+++ b/Runtime/Internal/Extensions/ComponentExtensions.cs
@@ -18,10 +18,10 @@ namespace Coffee.UIParticleInternal
        public static T[] GetComponentsInChildren<T>(this Component self, int depth)
            where T : Component
        {
-            var results = ListPool<T>.Rent();
+            var results = InternalListPool<T>.Rent();
            self.GetComponentsInChildren_Internal(results, depth);
            var array = results.ToArray();
-            ListPool<T>.Return(ref results);
+            InternalListPool<T>.Return(ref results);
            return array;
        }

@@ -38,7 +38,7 @@ namespace Coffee.UIParticleInternal
        private static void GetComponentsInChildren_Internal<T>(this Component self, List<T> results, int depth)
            where T : Component
        {
-            if (!self || results == null || depth < 0) return;
+            if (self == null || results == null || depth < 0) return;

            var tr = self.transform;
            if (tr.TryGetComponent<T>(out var t))
@@ -59,7 +59,7 @@ namespace Coffee.UIParticleInternal
        /// </summary>
        public static T GetOrAddComponent<T>(this Component self) where T : Component
        {
-            if (!self) return null;
+            if (self == null) return null;
            return self.TryGetComponent<T>(out var component)
                ? component
                : self.gameObject.AddComponent<T>();
@@ -134,10 +134,39 @@ namespace Coffee.UIParticleInternal
            Profiler.EndSample();
        }

+        /// <summary>
+        /// Add a component of a specific type to the children of a GameObject.
+        /// </summary>
+        public static void AddComponentOnChildren<T>(this Component self, bool includeSelf)
+            where T : Component
+        {
+            if (self == null) return;
+
+            Profiler.BeginSample("(COF)[ComponentExt] AddComponentOnChildren > Self");
+            if (includeSelf && !self.TryGetComponent<T>(out _))
+            {
+                self.gameObject.AddComponent<T>();
+            }
+
+            Profiler.EndSample();
+
+            Profiler.BeginSample("(COF)[ComponentExt] AddComponentOnChildren > Child");
+            var childCount = self.transform.childCount;
+            for (var i = 0; i < childCount; i++)
+            {
+                var child = self.transform.GetChild(i);
+                if (child.TryGetComponent<T>(out _)) continue;
+
+                child.gameObject.AddComponent<T>();
+            }
+
+            Profiler.EndSample();
+        }
+
 #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 (self == null) return null;
            if (!includeInactive) return self.GetComponentInParent<T>();

            var current = self.transform;
@@ -155,9 +184,9 @@ 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 && context.GetType() != typeof(T);
+            return context != null && context.GetType() != typeof(T);
        }

        /// <summary>
@@ -175,7 +204,7 @@ namespace Coffee.UIParticleInternal
            target.enabled = false;

            // Find MonoScript of the specified component.
-            foreach (var script in Resources.FindObjectsOfTypeAll<MonoScript>())
+            foreach (var script in MonoImporter.GetAllRuntimeMonoScripts())
            {
                if (script.GetClass() != typeof(T))
                {
--- a/Runtime/Internal/Extensions/GraphicExtensions.cs
+++ b/Runtime/Internal/Extensions/GraphicExtensions.cs
@@ -1,125 +0,0 @@
-using System.Collections.Generic;
-using UnityEditor;
-using UnityEngine;
-using UnityEngine.Profiling;
-using UnityEngine.UI;
-
-namespace Coffee.UIParticleInternal
-{
-    /// <summary>
-    /// Extension methods for Graphic class.
-    /// </summary>
-    internal static class GraphicExtensions
-    {
-        private static readonly Vector3[] s_WorldCorners = new Vector3[4];
-        private static readonly Bounds s_ScreenBounds = new Bounds(new Vector3(0.5f, 0.5f, 0.5f), new Vector3(1, 1, 1));
-
-        /// <summary>
-        /// Check if a Graphic component is currently in the screen view.
-        /// </summary>
-        public static void GetMaterialsForRendering(this Graphic self, List<Material> result)
-        {
-            result.Clear();
-            if (!self) return;
-
-            var cr = self.canvasRenderer;
-            var count = cr.materialCount;
-            var popCount = cr.popMaterialCount;
-
-            if (result.Capacity < count + popCount)
-            {
-                result.Capacity = count + popCount;
-            }
-
-            for (var i = 0; i < count; i++)
-            {
-                result.Add(cr.GetMaterial(i));
-            }
-
-            for (var i = 0; i < popCount; i++)
-            {
-                result.Add(cr.GetPopMaterial(i));
-            }
-        }
-
-        /// <summary>
-        /// Check if a Graphic component is currently in the screen view.
-        /// </summary>
-        public static bool IsInScreen(this Graphic self)
-        {
-            if (!self || !self.canvas) return false;
-
-            if (FrameCache.TryGet(self, nameof(IsInScreen), out bool result))
-            {
-                return result;
-            }
-
-            Profiler.BeginSample("(COF)[GraphicExt] IsInScreen");
-            var cam = self.canvas.renderMode != RenderMode.ScreenSpaceOverlay
-                ? self.canvas.worldCamera
-                : null;
-            var min = new Vector3(float.MaxValue, float.MaxValue, float.MaxValue);
-            var max = new Vector3(float.MinValue, float.MinValue, float.MinValue);
-            self.rectTransform.GetWorldCorners(s_WorldCorners);
-            var screenSize = GetScreenSize();
-            for (var i = 0; i < 4; i++)
-            {
-                if (cam)
-                {
-                    s_WorldCorners[i] = cam.WorldToViewportPoint(s_WorldCorners[i]);
-                }
-                else
-                {
-                    s_WorldCorners[i] = RectTransformUtility.WorldToScreenPoint(null, s_WorldCorners[i]);
-                    s_WorldCorners[i].x /= screenSize.x;
-                    s_WorldCorners[i].y /= screenSize.y;
-                }
-
-                s_WorldCorners[i].z = 0;
-                min = Vector3.Min(s_WorldCorners[i], min);
-                max = Vector3.Max(s_WorldCorners[i], max);
-            }
-
-            var bounds = new Bounds(min, Vector3.zero);
-            bounds.Encapsulate(max);
-            result = bounds.Intersects(s_ScreenBounds);
-            FrameCache.Set(self, nameof(IsInScreen), result);
-            Profiler.EndSample();
-
-            return result;
-        }
-
-        /// <summary>
-        /// Get the actual main texture of a Graphic component.
-        /// </summary>
-        public static Texture GetActualMainTexture(this Graphic self)
-        {
-            var image = self as Image;
-            if (image == null) return self.mainTexture;
-
-            var sprite = image.overrideSprite;
-            return sprite ? sprite.GetActualTexture() : self.mainTexture;
-        }
-
-        private static Vector2Int GetScreenSize()
-        {
-#if UNITY_EDITOR
-            if (!Application.isPlaying && !Camera.current)
-            {
-                var res = UnityStats.screenRes.Split('x');
-                return new Vector2Int(int.Parse(res[0]), int.Parse(res[1]));
-            }
-#endif
-            return new Vector2Int(Screen.width, Screen.height);
-        }
-
-        public static float GetParentGroupAlpha(this Graphic self)
-        {
-            var alpha = self.canvasRenderer.GetAlpha();
-            if (Mathf.Approximately(alpha, 0)) return 1;
-
-            var inheritedAlpha = self.canvasRenderer.GetInheritedAlpha();
-            return Mathf.Clamp01(inheritedAlpha / alpha);
-        }
-    }
-}
--- a/Runtime/Internal/Extensions/GraphicExtensions.cs.meta
+++ b/Runtime/Internal/Extensions/GraphicExtensions.cs.meta
@@ -1,11 +0,0 @@
-fileFormatVersion: 2
-guid: 3803b037cd2ed45459dd660072f223dd
-MonoImporter:
-  externalObjects: {}
-  serializedVersion: 2
-  defaultReferences: []
-  executionOrder: 0
-  icon: {instanceID: 0}
-  userData: 
-  assetBundleName: 
-  assetBundleVariant: 
--- a/Runtime/Internal/Extensions/Misc.cs
+++ b/Runtime/Internal/Extensions/Misc.cs
@@ -1,48 +0,0 @@
-using System.Diagnostics;
-using UnityEditor;
-using UnityEngine;
-
-namespace Coffee.UIParticleInternal
-{
-    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);
-            }
-        }
-
-        [Conditional("UNITY_EDITOR")]
-        public static void SetDirty(Object obj)
-        {
-#if UNITY_EDITOR
-            if (!obj) return;
-            EditorUtility.SetDirty(obj);
-#endif
-        }
-    }
-}
--- a/Runtime/Internal/Extensions/SpriteExtensions.cs
+++ b/Runtime/Internal/Extensions/SpriteExtensions.cs
@@ -17,23 +17,25 @@ namespace Coffee.UIParticleInternal
            Type.GetType("UnityEditor.Experimental.U2D.SpriteEditorExtension, UnityEditor")
            ?? Type.GetType("UnityEditor.U2D.SpriteEditorExtension, UnityEditor");

-        private static readonly MethodInfo s_GetActiveAtlasTextureMethod = s_SpriteEditorExtensionType
-            .GetMethod("GetActiveAtlasTexture", BindingFlags.Static | BindingFlags.NonPublic);
+        private static readonly Func<Sprite, Texture2D> s_GetActiveAtlasTextureMethod =
+            (Func<Sprite, Texture2D>)Delegate.CreateDelegate(typeof(Func<Sprite, Texture2D>),
+                s_SpriteEditorExtensionType
+                    .GetMethod("GetActiveAtlasTexture", BindingFlags.Static | BindingFlags.NonPublic));

-        private static readonly MethodInfo s_GetActiveAtlasMethod = s_SpriteEditorExtensionType
-            .GetMethod("GetActiveAtlas", BindingFlags.Static | BindingFlags.NonPublic);
+        private static readonly Func<Sprite, SpriteAtlas> s_GetActiveAtlasMethod =
+            (Func<Sprite, SpriteAtlas>)Delegate.CreateDelegate(typeof(Func<Sprite, SpriteAtlas>),
+                s_SpriteEditorExtensionType
+                    .GetMethod("GetActiveAtlas", BindingFlags.Static | BindingFlags.NonPublic));

        /// <summary>
        /// Get the actual texture of a sprite in play mode or edit mode.
        /// </summary>
        public static Texture2D GetActualTexture(this Sprite self)
        {
-            if (!self) return null;
+            if (self == null) return null;

-            if (Application.isPlaying) return self.texture;
-
-            var ret = s_GetActiveAtlasTextureMethod.Invoke(null, new object[] { self }) as Texture2D;
-            return ret ? ret : self.texture;
+            var ret = s_GetActiveAtlasTextureMethod(self);
+            return ret != null ? ret : self.texture;
        }

        /// <summary>
@@ -41,9 +43,9 @@ namespace Coffee.UIParticleInternal
        /// </summary>
        public static SpriteAtlas GetActiveAtlas(this Sprite self)
        {
-            if (!self) return null;
+            if (self == null) return null;

-            return s_GetActiveAtlasMethod.Invoke(null, new object[] { self }) as SpriteAtlas;
+            return s_GetActiveAtlasMethod(self);
        }
 #else
        /// <summary>
@@ -51,7 +53,7 @@ namespace Coffee.UIParticleInternal
        /// </summary>
        internal static Texture2D GetActualTexture(this Sprite self)
        {
-            return self ? self.texture : null;
+            return self != null ? self.texture : null;
        }
 #endif
    }
--- a/Runtime/Internal/ProjectSettings/PreloadedProjectSettings.cs
+++ b/Runtime/Internal/ProjectSettings/PreloadedProjectSettings.cs
@@ -1,9 +1,9 @@
 using System;
 using System.Linq;
-using System.Reflection;
 using UnityEngine;
 using Object = UnityEngine.Object;
 #if UNITY_EDITOR
+using System.IO;
 using UnityEditor;
 using UnityEditor.Build;
 using UnityEditor.Build.Reporting;
@@ -14,6 +14,14 @@ namespace Coffee.UIParticleInternal
    public abstract class PreloadedProjectSettings : ScriptableObject
 #if UNITY_EDITOR
    {
+        private class Postprocessor : AssetPostprocessor
+        {
+            private static void OnPostprocessAllAssets(string[] _, string[] __, string[] ___, string[] ____)
+            {
+                Initialize();
+            }
+        }
+
        private class PreprocessBuildWithReport : IPreprocessBuildWithReport
        {
            int IOrderedCallback.callbackOrder => 0;
@@ -24,32 +32,32 @@ namespace Coffee.UIParticleInternal
            }
        }

-        [InitializeOnLoadMethod]
-        [InitializeOnEnterPlayMode]
        private static void Initialize()
        {
-            const BindingFlags flags = BindingFlags.Public | BindingFlags.Static | BindingFlags.FlattenHierarchy;
            foreach (var t in TypeCache.GetTypesDerivedFrom(typeof(PreloadedProjectSettings<>)))
            {
                var defaultSettings = GetDefaultSettings(t);
-                if (!defaultSettings)
+                if (defaultSettings == null)
                {
                    // When create a new instance, automatically set it as default settings.
-                    defaultSettings = t.GetProperty("instance", flags)
-                        ?.GetValue(null, null) as PreloadedProjectSettings;
+                    defaultSettings = CreateInstance(t) as PreloadedProjectSettings;
+                    SetDefaultSettings(defaultSettings);
                }
                else if (GetPreloadedSettings(t).Length != 1)
                {
                    SetDefaultSettings(defaultSettings);
                }
-            }

-            EditorApplication.QueuePlayerLoopUpdate();
+                if (defaultSettings != null)
+                {
+                    defaultSettings.OnInitialize();
+                }
+            }
        }

        protected static string GetDefaultName(Type type, bool nicify)
        {
-            var typeName = type.Name.Replace("ProjectSettings", "");
+            var typeName = type.Name;
            return nicify
                ? ObjectNames.NicifyVariableName(typeName)
                : typeName;
@@ -58,7 +66,7 @@ namespace Coffee.UIParticleInternal
        private static Object[] GetPreloadedSettings(Type type)
        {
            return PlayerSettings.GetPreloadedAssets()
-                .Where(x => x && x.GetType() == type)
+                .Where(x => x != null && x.GetType() == type)
                .ToArray();
        }

@@ -68,12 +76,13 @@ namespace Coffee.UIParticleInternal
                   ?? AssetDatabase.FindAssets($"t:{nameof(PreloadedProjectSettings)}")
                       .Select(AssetDatabase.GUIDToAssetPath)
                       .Select(AssetDatabase.LoadAssetAtPath<PreloadedProjectSettings>)
-                       .FirstOrDefault(x => x && x.GetType() == type);
+                       .FirstOrDefault(x => x != null && x.GetType() == type);
        }

        protected static void SetDefaultSettings(PreloadedProjectSettings asset)
        {
-            if (!asset) return;
+            if (asset == null) return;
+
            var type = asset.GetType();
            if (string.IsNullOrEmpty(AssetDatabase.GetAssetPath(asset)))
            {
@@ -84,13 +93,17 @@ namespace Coffee.UIParticleInternal

                var assetPath = $"Assets/ProjectSettings/{GetDefaultName(type, false)}.asset";
                assetPath = AssetDatabase.GenerateUniqueAssetPath(assetPath);
-                AssetDatabase.CreateAsset(asset, assetPath);
+                if (!File.Exists(assetPath))
+                {
+                    AssetDatabase.CreateAsset(asset, assetPath);
+                    asset.OnCreateAsset();
+                }
            }

            var preloadedAssets = PlayerSettings.GetPreloadedAssets();
            var projectSettings = GetPreloadedSettings(type);
            PlayerSettings.SetPreloadedAssets(preloadedAssets
-                .Where(x => x)
+                .Where(x => x != null)
                .Except(projectSettings.Except(new[] { asset }))
                .Append(asset)
                .Distinct()
@@ -98,6 +111,14 @@ namespace Coffee.UIParticleInternal

            AssetDatabase.Refresh();
        }
+
+        protected virtual void OnCreateAsset()
+        {
+        }
+
+        protected virtual void OnInitialize()
+        {
+        }
    }
 #else
    {
@@ -112,17 +133,19 @@ namespace Coffee.UIParticleInternal
 #if UNITY_EDITOR
        private string _jsonText;

+        public static bool hasInstance => s_Instance != null;
+
        public static T instance
        {
            get
            {
-                if (s_Instance) return s_Instance;
+                if (s_Instance != null) return s_Instance;

                s_Instance = GetDefaultSettings(typeof(T)) as T;
-                if (s_Instance) return s_Instance;
+                if (s_Instance != null) return s_Instance;

                s_Instance = CreateInstance<T>();
-                if (!s_Instance)
+                if (s_Instance == null)
                {
                    s_Instance = null;
                    return s_Instance;
@@ -151,7 +174,7 @@ namespace Coffee.UIParticleInternal
            }
        }
 #else
-        public static T instance => s_Instance ? s_Instance : s_Instance = CreateInstance<T>();
+    public static T instance => s_Instance != null ? s_Instance : s_Instance = CreateInstance<T>();
 #endif

        /// <summary>
@@ -160,7 +183,7 @@ namespace Coffee.UIParticleInternal
        protected virtual void OnEnable()
        {
 #if UNITY_EDITOR
-            var isDefaultSettings = !s_Instance || s_Instance == this || GetDefaultSettings(typeof(T)) == this;
+            var isDefaultSettings = s_Instance == null || s_Instance == this || GetDefaultSettings(typeof(T)) == this;
            if (!isDefaultSettings)
            {
                DestroyImmediate(this, true);
@@ -170,7 +193,7 @@ namespace Coffee.UIParticleInternal
            EditorApplication.playModeStateChanged += OnPlayModeStateChanged;
 #endif

-            if (s_Instance) return;
+            if (s_Instance != null) return;
            s_Instance = this as T;
        }

@@ -199,7 +222,7 @@ namespace Coffee.UIParticleInternal

            public override void OnGUI(string searchContext)
            {
-                if (!_target)
+                if (_target == null)
                {
                    if (_editor)
                    {
--- a/Runtime/Internal/Utilities/FastAction.cs
+++ b/Runtime/Internal/Utilities/FastAction.cs
@@ -10,8 +10,9 @@ namespace Coffee.UIParticleInternal
    /// </summary>
    internal class FastActionBase<T>
    {
-        private static readonly ObjectPool<LinkedListNode<T>> s_NodePool =
-            new ObjectPool<LinkedListNode<T>>(() => new LinkedListNode<T>(default), _ => true, x => x.Value = default);
+        private static readonly InternalObjectPool<LinkedListNode<T>> s_NodePool =
+            new InternalObjectPool<LinkedListNode<T>>(() => new LinkedListNode<T>(default), _ => true,
+                x => x.Value = default);

        private readonly LinkedList<T> _delegates = new LinkedList<T>();

--- a/Runtime/Internal/Utilities/Logging.cs
+++ b/Runtime/Internal/Utilities/Logging.cs
@@ -48,7 +48,7 @@ namespace Coffee.UIParticleInternal
        public static void LogIf(bool enable, object tag, object message, Object context = null)
        {
            if (!enable) return;
-            Log_Internal(LogType.Log, tag, message, context ? context : tag as Object);
+            Log_Internal(LogType.Log, tag, message, context != null ? context : tag as Object);
        }

 #if !ENABLE_COFFEE_LOGGER
@@ -56,7 +56,7 @@ namespace Coffee.UIParticleInternal
 #endif
        public static void Log(object tag, object message, Object context = null)
        {
-            Log_Internal(LogType.Log, tag, message, context ? context : tag as Object);
+            Log_Internal(LogType.Log, tag, message, context != null ? context : tag as Object);
        }

 #if !ENABLE_COFFEE_LOGGER
@@ -64,13 +64,13 @@ namespace Coffee.UIParticleInternal
 #endif
        public static void LogWarning(object tag, object message, Object context = null)
        {
-            Log_Internal(LogType.Warning, tag, message, context ? context : tag as Object);
+            Log_Internal(LogType.Warning, tag, message, context != null ? context : tag as Object);
        }

        public static void LogError(object tag, object message, Object context = null)
        {
 #if ENABLE_COFFEE_LOGGER
-            Log_Internal(LogType.Error, tag, message, context ? context : tag as Object);
+            Log_Internal(LogType.Error, tag, message, context != null ? context : tag as Object);
 #else
            Debug.LogError($"{tag}: {message}", context);
 #endif
--- a/Runtime/Internal/Utilities/MaterialRepository.cs
+++ b/Runtime/Internal/Utilities/MaterialRepository.cs
@@ -15,7 +15,7 @@ namespace Coffee.UIParticleInternal

 #if UNITY_EDITOR
        [RuntimeInitializeOnLoadMethod(RuntimeInitializeLoadType.SubsystemRegistration)]
-        private static void Clear()
+        public static void Clear()
        {
            s_Repository.Clear();
        }
--- a/Runtime/Internal/Utilities/Misc.cs
+++ b/Runtime/Internal/Utilities/Misc.cs
@@ -0,0 +1,132 @@
+using System;
+using System.Diagnostics;
+using UnityEditor;
+using UnityEngine;
+using Object = UnityEngine.Object;
+#if UNITY_EDITOR
+using System.IO;
+using System.Linq;
+using System.Reflection;
+#if UNITY_2021_2_OR_NEWER
+using UnityEditor.SceneManagement;
+#else
+using UnityEditor.Experimental.SceneManagement;
+#endif
+#endif
+
+namespace Coffee.UIParticleInternal
+{
+    internal static class Misc
+    {
+        public static T[] FindObjectsOfType<T>() where T : Object
+        {
+#if UNITY_2023_1_OR_NEWER
+            return Object.FindObjectsByType<T>(FindObjectsInactive.Include, FindObjectsSortMode.None);
+#else
+            return Object.FindObjectsOfType<T>();
+#endif
+        }
+
+        public static void Destroy(Object obj)
+        {
+            if (obj == null) return;
+#if UNITY_EDITOR
+            if (!Application.isPlaying)
+            {
+                Object.DestroyImmediate(obj);
+            }
+            else
+#endif
+            {
+                Object.Destroy(obj);
+            }
+        }
+
+        public static void DestroyImmediate(Object obj)
+        {
+            if (obj == null) return;
+#if UNITY_EDITOR
+            if (Application.isEditor)
+            {
+                Object.DestroyImmediate(obj);
+            }
+            else
+#endif
+            {
+                Object.Destroy(obj);
+            }
+        }
+
+        [Conditional("UNITY_EDITOR")]
+        public static void SetDirty(Object obj)
+        {
+#if UNITY_EDITOR
+            if (obj == null) return;
+            EditorUtility.SetDirty(obj);
+#endif
+        }
+
+#if UNITY_EDITOR
+        public static T[] GetAllComponentsInPrefabStage<T>() where T : Component
+        {
+            var prefabStage = PrefabStageUtility.GetCurrentPrefabStage();
+            if (prefabStage == null) return Array.Empty<T>();
+
+            return prefabStage.prefabContentsRoot.GetComponentsInChildren<T>(true);
+        }
+
+        public static bool isBatchOrBuilding => Application.isBatchMode || BuildPipeline.isBuildingPlayer;
+#endif
+
+        [Conditional("UNITY_EDITOR")]
+        public static void QueuePlayerLoopUpdate()
+        {
+#if UNITY_EDITOR
+            if (!EditorApplication.isPlaying)
+            {
+                EditorApplication.QueuePlayerLoopUpdate();
+            }
+#endif
+        }
+    }
+
+#if !UNITY_2021_2_OR_NEWER
+    [AttributeUsage(AttributeTargets.Class)]
+    [Conditional("UNITY_EDITOR")]
+    internal class IconAttribute : Attribute
+    {
+        private readonly string _path;
+
+        public IconAttribute(string path)
+        {
+            _path = path;
+        }
+
+#if UNITY_EDITOR
+        private static Action<Object, Texture2D> s_SetIconForObject = typeof(EditorGUIUtility)
+            .GetMethod("SetIconForObject", BindingFlags.Static | BindingFlags.NonPublic)
+            .CreateDelegate(typeof(Action<Object, Texture2D>), null) as Action<Object, Texture2D>;
+
+        [InitializeOnLoadMethod]
+        private static void InitializeOnLoadMethod()
+        {
+            if (Misc.isBatchOrBuilding) return;
+
+            var types = TypeCache.GetTypesWithAttribute<IconAttribute>();
+            var scripts = MonoImporter.GetAllRuntimeMonoScripts();
+            foreach (var type in types)
+            {
+                var script = scripts.FirstOrDefault(x => x.GetClass() == type);
+                if (script == null) continue;
+
+                var path = type.GetCustomAttribute<IconAttribute>()?._path;
+                var icon = AssetDatabase.LoadAssetAtPath<Texture2D>(path);
+                if (icon == null) continue;
+
+                s_SetIconForObject(script, icon);
+            }
+        }
+#endif
+    }
+#endif
+}
--- a/Runtime/Internal/Extensions/Misc.cs.meta
+++ b/Runtime/Internal/Extensions/Misc.cs.meta
@@ -1,5 +1,5 @@
 fileFormatVersion: 2
-guid: 39ed6a6b0a72e482488bd298b2ae762e
+guid: 182319ecc315e4858b119764af0fbcb0
 MonoImporter:
  externalObjects: {}
  serializedVersion: 2
--- a/Runtime/Internal/Utilities/ObjectPool.cs
+++ b/Runtime/Internal/Utilities/ObjectPool.cs
@@ -6,15 +6,58 @@ namespace Coffee.UIParticleInternal
    /// <summary>
    /// Object pool.
    /// </summary>
-    internal class ObjectPool<T>
+    internal class InternalObjectPool<T> where T : class
    {
+#if UNITY_2021_1_OR_NEWER
+        private readonly Predicate<T> _onValid; // Delegate for checking if instances are valid
+        private readonly UnityEngine.Pool.ObjectPool<T> _pool;
+
+        public InternalObjectPool(Func<T> onCreate, Predicate<T> onValid, Action<T> onReturn)
+        {
+            _pool = new UnityEngine.Pool.ObjectPool<T>(onCreate, null, onReturn);
+            _onValid = onValid;
+        }
+
+        /// <summary>
+        /// Rent an instance from the pool.
+        /// When you no longer need it, return it with <see cref="Return" />.
+        /// </summary>
+        public T Rent()
+        {
+            while (0 < _pool.CountInactive)
+            {
+                var instance = _pool.Get();
+                if (_onValid(instance))
+                {
+                    return instance;
+                }
+            }
+
+            // 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}).");
+            return _pool.Get();
+        }
+
+        /// <summary>
+        /// Return an instance to the pool and assign null.
+        /// Be sure to return the instance obtained with <see cref="Rent" /> with this method.
+        /// </summary>
+        public void Return(ref T instance)
+        {
+            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}).");
+            instance = default; // Set the reference to null.
+        }
+#else
        private readonly Func<T> _onCreate; // Delegate for creating instances
        private readonly Action<T> _onReturn; // Delegate for returning instances to the pool
        private readonly Predicate<T> _onValid; // Delegate for checking if instances are valid
        private readonly Stack<T> _pool = new Stack<T>(32); // Object pool
        private int _count; // Total count of created instances

-        public ObjectPool(Func<T> onCreate, Predicate<T> onValid, Action<T> onReturn)
+        public InternalObjectPool(Func<T> onCreate, Predicate<T> onValid, Action<T> onReturn)
        {
            _onCreate = onCreate;
            _onValid = onValid;
@@ -54,15 +97,40 @@ namespace Coffee.UIParticleInternal
            Logging.Log(this, $"An instance is released (pooled: {_pool.Count}, created: {_count}).");
            instance = default; // Set the reference to null.
        }
+#endif
    }

    /// <summary>
    /// Object pool for <see cref="List{T}" />.
    /// </summary>
-    internal static class ListPool<T>
+    internal static class InternalListPool<T>
    {
-        private static readonly ObjectPool<List<T>> s_ListPool =
-            new ObjectPool<List<T>>(() => new List<T>(), _ => true, x => x.Clear());
+#if UNITY_2021_1_OR_NEWER
+        /// <summary>
+        /// Rent an instance from the pool.
+        /// When you no longer need it, return it with <see cref="Return" />.
+        /// </summary>
+        public static List<T> Rent()
+        {
+            return UnityEngine.Pool.ListPool<T>.Get();
+        }
+
+        /// <summary>
+        /// Return an instance to the pool and assign null.
+        /// Be sure to return the instance obtained with <see cref="Rent" /> with this method.
+        /// </summary>
+        public static void Return(ref List<T> toRelease)
+        {
+            if (toRelease != null)
+            {
+                UnityEngine.Pool.ListPool<T>.Release(toRelease);
+            }
+
+            toRelease = null;
+        }
+#else
+        private static readonly InternalObjectPool<List<T>> s_ListPool =
+            new InternalObjectPool<List<T>>(() => new List<T>(), _ => true, x => x.Clear());

        /// <summary>
        /// Rent an instance from the pool.
@@ -81,5 +149,6 @@ namespace Coffee.UIParticleInternal
        {
            s_ListPool.Return(ref toRelease);
        }
+#endif
    }
 }
--- a/Runtime/Internal/Utilities/ObjectRepository.cs
+++ b/Runtime/Internal/Utilities/ObjectRepository.cs
@@ -90,7 +90,7 @@ namespace Coffee.UIParticleInternal
            Profiler.BeginSample("(COF)[ObjectRepository] GetFromCache");
            if (_cache.TryGetValue(hash, out var entry))
            {
-                if (!entry.storedObject)
+                if (entry.storedObject == null)
                {
                    Release(ref entry.storedObject);
                    Profiler.EndSample();
@@ -116,7 +116,7 @@ namespace Coffee.UIParticleInternal

        private void Add(Hash128 hash, ref T obj, T newObject)
        {
-            if (!newObject)
+            if (newObject == null)
            {
                Release(ref obj);
                obj = newObject;
@@ -151,7 +151,7 @@ namespace Coffee.UIParticleInternal
                && _cache.TryGetValue(hash, out var entry))
            {
                entry.reference--;
-                if (entry.reference <= 0 || !entry.storedObject)
+                if (entry.reference <= 0 || entry.storedObject == null)
                {
                    Remove(entry);
                }
@@ -192,7 +192,7 @@ namespace Coffee.UIParticleInternal
            public void Release(Action<T> onRelease)
            {
                reference = 0;
-                if (storedObject)
+                if (storedObject != null)
                {
                    onRelease?.Invoke(storedObject);
                }
--- a/Runtime/Internal/Utilities/UIExtraCallbacks.cs
+++ b/Runtime/Internal/Utilities/UIExtraCallbacks.cs
@@ -14,6 +14,8 @@ namespace Coffee.UIParticleInternal
        private static readonly FastAction s_AfterCanvasRebuildAction = new FastAction();
        private static readonly FastAction s_LateAfterCanvasRebuildAction = new FastAction();
        private static readonly FastAction s_BeforeCanvasRebuildAction = new FastAction();
+        private static readonly FastAction s_OnScreenSizeChangedAction = new FastAction();
+        private static Vector2Int s_LastScreenSize;

        static UIExtraCallbacks()
        {
@@ -48,6 +50,15 @@ namespace Coffee.UIParticleInternal
            remove => s_AfterCanvasRebuildAction.Remove(value);
        }

+        /// <summary>
+        /// Event that occurs when the screen size changes.
+        /// </summary>
+        public static event Action onScreenSizeChanged
+        {
+            add => s_OnScreenSizeChangedAction.Add(value);
+            remove => s_OnScreenSizeChangedAction.Remove(value);
+        }
+
        /// <summary>
        /// Initializes the UIExtraCallbacks to ensure proper event handling.
        /// </summary>
@@ -77,6 +88,17 @@ namespace Coffee.UIParticleInternal
        /// </summary>
        private static void OnBeforeCanvasRebuild()
        {
+            var screenSize = new Vector2Int(Screen.width, Screen.height);
+            if (s_LastScreenSize != screenSize)
+            {
+                if (s_LastScreenSize != default)
+                {
+                    s_OnScreenSizeChangedAction.Invoke();
+                }
+
+                s_LastScreenSize = screenSize;
+            }
+
            s_BeforeCanvasRebuildAction.Invoke();
            InitializeAfterCanvasRebuild();
        }
--- a/Runtime/UIParticle.cs
+++ b/Runtime/UIParticle.cs
@@ -9,12 +9,16 @@ using UnityEngine.UI;
 using Random = UnityEngine.Random;

 [assembly: InternalsVisibleTo("Coffee.UIParticle.Editor")]
+[assembly: InternalsVisibleTo("Coffee.UIParticle.Editor.Tests")]
+[assembly: InternalsVisibleTo("Coffee.UIParticle.PerformanceDemo")]
+[assembly: InternalsVisibleTo("Coffee.UIParticle.Demo")]

 namespace Coffee.UIExtensions
 {
    /// <summary>
    /// Render maskable and sortable particle effect ,without Camera, RenderTexture or Canvas.
    /// </summary>
+    [Icon("Packages/com.coffee.ui-particle/Editor/UIParticleIcon.png")]
    [ExecuteAlways]
    [RequireComponent(typeof(RectTransform))]
    [RequireComponent(typeof(CanvasRenderer))]
@@ -117,6 +121,10 @@ namespace Coffee.UIExtensions
                 "Change the bake view size.")]
        private float m_CustomViewSize = 10;

+        [SerializeField]
+        [Tooltip("Time scale multiplier.")]
+        private float m_TimeScaleMultiplier = 1;
+
        private readonly List<UIParticleRenderer> _renderers = new List<UIParticleRenderer>();
        private Camera _bakeCamera;
        private int _groupId;
@@ -255,6 +263,15 @@ namespace Coffee.UIExtensions
            set => m_CustomViewSize = Mathf.Max(0.1f, value);
        }

+        /// <summary>
+        /// Time scale multiplier.
+        /// </summary>
+        public float timeScaleMultiplier
+        {
+            get => m_TimeScaleMultiplier;
+            set => m_TimeScaleMultiplier = value;
+        }
+
        internal bool useMeshSharing => m_MeshSharing != MeshSharing.None;

        internal bool isPrimary =>
@@ -454,7 +471,7 @@ namespace Coffee.UIExtensions
            for (var i = 0; i < _renderers.Count; i++)
            {
                var r = _renderers[i];
-                if (!r || !r.material) continue;
+                if (r == null || r.material == null) continue;
                result.Add(r.material);
            }
        }
@@ -472,7 +489,7 @@ namespace Coffee.UIExtensions
        /// </summary>
        public void SetParticleSystemInstance(GameObject instance, bool destroyOldParticles)
        {
-            if (!instance) return;
+            if (instance == null) return;

            var childCount = transform.childCount;
            for (var i = 0; i < childCount; i++)
@@ -501,7 +518,7 @@ namespace Coffee.UIExtensions
        /// </summary>
        public void SetParticleSystemPrefab(GameObject prefab)
        {
-            if (!prefab) return;
+            if (prefab == null) return;

            SetParticleSystemInstance(Instantiate(prefab.gameObject), true);
        }
@@ -521,12 +538,14 @@ namespace Coffee.UIExtensions
        /// </summary>
        private void RefreshParticles(GameObject root)
        {
-            if (!root) return;
+            if (root == null) 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)
+                if (!ps
+                    || ps.gameObject.CompareTag("EditorOnly") // Ignore "EditorOnly" tagged ParticleSystems.
+                    || ps.GetComponentInParent<UIParticle>(true) != this) // Ignore ParticleSystems that are not under this UIParticle.
                {
                    particles.RemoveAt(i);
                }
@@ -574,13 +593,15 @@ namespace Coffee.UIExtensions
            for (var i = 0; i < particleSystems.Count; i++)
            {
                var ps = particleSystems[i];
-                if (!ps) continue;
-                GetRenderer(j++).Set(this, ps, false);
+                if (ps == null) continue;
+
+                var mainEmitter = ps.GetMainEmitter(particleSystems);
+                GetRenderer(j++).Set(this, ps, false, mainEmitter);

                // If the trail is enabled, set it additionally.
                if (ps.trails.enabled)
                {
-                    GetRenderer(j++).Set(this, ps, true);
+                    GetRenderer(j++).Set(this, ps, true, mainEmitter);
                }
            }
        }
@@ -623,7 +644,7 @@ namespace Coffee.UIExtensions
            for (var i = 0; i < _renderers.Count; i++)
            {
                var r = _renderers[i];
-                if (r) continue;
+                if (r != null) continue;

                RefreshParticles(particles);
                break;
@@ -633,7 +654,7 @@ namespace Coffee.UIExtensions
            for (var i = 0; i < _renderers.Count; i++)
            {
                var r = _renderers[i];
-                if (!r) continue;
+                if (r == null) continue;

                r.UpdateMesh(bakeCamera);
            }
@@ -662,7 +683,7 @@ namespace Coffee.UIExtensions
            for (var i = 0; i < _renderers.Count; i++)
            {
                var r = _renderers[i];
-                if (!r) continue;
+                if (r == null) continue;
                r.maskable = maskable;
                r.SetMaterialDirty();
            }
@@ -675,7 +696,7 @@ namespace Coffee.UIExtensions
                _renderers.Add(UIParticleRenderer.AddRenderer(this, index));
            }

-            if (!_renderers[index])
+            if (_renderers[index] == null)
            {
                _renderers[index] = UIParticleRenderer.AddRenderer(this, index);
            }
@@ -685,13 +706,13 @@ namespace Coffee.UIExtensions

        private Camera GetBakeCamera()
        {
-            if (!canvas) return Camera.main;
+            if (canvas == null) return Camera.main;
            if (!useCustomView && canvas.renderMode != RenderMode.ScreenSpaceOverlay && canvas.rootCanvas.worldCamera)
            {
                return canvas.rootCanvas.worldCamera;
            }

-            if (_bakeCamera)
+            if (_bakeCamera != null)
            {
                _bakeCamera.orthographicSize = useCustomView ? customViewSize : 10;
                return _bakeCamera;
@@ -710,7 +731,7 @@ namespace Coffee.UIExtensions
            }

            // Create baking camera.
-            if (!_bakeCamera)
+            if (_bakeCamera == null)
            {
                var go = new GameObject("[generated] UIParticle BakingCamera");
                go.SetActive(false);
--- a/Runtime/UIParticle.cs.meta
+++ b/Runtime/UIParticle.cs.meta
@@ -5,7 +5,7 @@ MonoImporter:
  serializedVersion: 2
  defaultReferences: []
  executionOrder: 0
-  icon: {fileID: 2800000, guid: 5f0675613942149309588d556e33d990, type: 3}
+  icon: {instanceID: 0}
  userData: 
  assetBundleName: 
  assetBundleVariant: 
--- a/Runtime/UIParticleAttractor.cs
+++ b/Runtime/UIParticleAttractor.cs
@@ -208,7 +208,7 @@ namespace Coffee.UIExtensions

        private Vector3 GetDestinationPosition(UIParticle uiParticle, ParticleSystem particleSystem)
        {
-            var isUI = uiParticle && uiParticle.enabled;
+            var isUI = uiParticle != null && uiParticle.enabled;
            var psPos = particleSystem.transform.position;
            var attractorPos = transform.position;
            var dstPos = attractorPos;
--- a/Runtime/UIParticleRenderer.cs
+++ b/Runtime/UIParticleRenderer.cs
@@ -15,6 +15,7 @@ using UnityEngine.UI;

 namespace Coffee.UIExtensions
 {
+    [Icon("Packages/com.coffee.ui-particle/Editor/UIParticleIcon.png")]
    [ExecuteAlways]
    [RequireComponent(typeof(RectTransform))]
    [RequireComponent(typeof(CanvasRenderer))]
@@ -24,7 +25,6 @@ namespace Coffee.UIExtensions
        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<Color32> s_Colors = new List<Color32>();
        private static readonly Vector3[] s_Corners = new Vector3[4];
        private bool _delay;
        private int _index;
@@ -41,6 +41,7 @@ namespace Coffee.UIExtensions
        private Vector2Int _prevScreenSize;
        private bool _preWarm;
        private ParticleSystemRenderer _renderer;
+        private ParticleSystem _mainEmitter;

        public override Texture mainTexture => _isTrail ? null : _particleSystem.GetTextureForSprite();

@@ -54,7 +55,7 @@ namespace Coffee.UIExtensions
                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)
+                if (canvas != null)
                {
                    var worldToLocalMatrix = canvas.rootCanvas.transform.worldToLocalMatrix;
                    for (var i = 0; i < 4; ++i)
@@ -94,7 +95,7 @@ namespace Coffee.UIExtensions
        {
            get
            {
-                if (!_materialForRendering)
+                if (_materialForRendering == null)
                {
                    _materialForRendering = base.materialForRendering;
                }
@@ -105,7 +106,7 @@ namespace Coffee.UIExtensions

        public void Reset(int index = -1)
        {
-            if (_renderer)
+            if (_renderer != null)
            {
                _renderer.enabled = true;
            }
@@ -113,13 +114,14 @@ namespace Coffee.UIExtensions
            _parent = null;
            _particleSystem = null;
            _renderer = null;
+            _mainEmitter = null;
            if (0 <= index)
            {
                _index = index;
            }

            //_emitter = null;
-            if (this && isActiveAndEnabled)
+            if (isActiveAndEnabled)
            {
                material = null;
                canvasRenderer.Clear();
@@ -138,7 +140,7 @@ namespace Coffee.UIExtensions
            base.OnEnable();

            hideFlags = UIParticleProjectSettings.globalHideFlags;
-            if (!s_CombineInstances[0].mesh)
+            if (s_CombineInstances[0].mesh == null)
            {
                s_CombineInstances[0].mesh = new Mesh
                {
@@ -189,7 +191,6 @@ namespace Coffee.UIExtensions
            if (!IsActive() || !_parent)
            {
                MaterialRepository.Release(ref _modifiedMaterial);
-                _modifiedMaterial = null;
                return baseMaterial;
            }

@@ -215,16 +216,17 @@ namespace Coffee.UIExtensions
            );
            if (!MaterialRepository.Valid(hash, _modifiedMaterial))
            {
-                MaterialRepository.Get(hash, ref _modifiedMaterial, () => new Material(modifiedMaterial)
+                MaterialRepository.Get(hash, ref _modifiedMaterial, x => new Material(x.mat)
                {
-                    hideFlags = HideFlags.HideAndDontSave
-                });
+                    hideFlags = HideFlags.HideAndDontSave,
+                    mainTexture = x.texture ? x.texture : x.mat.mainTexture
+                }, (mat: modifiedMaterial, texture));
            }

            return _modifiedMaterial;
        }

-        public void Set(UIParticle parent, ParticleSystem ps, bool isTrail)
+        public void Set(UIParticle parent, ParticleSystem ps, bool isTrail, ParticleSystem mainEmitter)
        {
            _parent = parent;
            maskable = parent.maskable;
@@ -247,10 +249,7 @@ namespace Coffee.UIExtensions

            ps.TryGetComponent(out _renderer);
            _renderer.enabled = false;
-
-            //_emitter = emitter;
            _isTrail = isTrail;
-
            _renderer.GetSharedMaterials(s_Materials);
            material = s_Materials[isTrail ? 1 : 0];
            s_Materials.Clear();
@@ -267,6 +266,7 @@ namespace Coffee.UIExtensions
            _prevScreenSize = new Vector2Int(Screen.width, Screen.height);
            _prevCanvasScale = canvas ? canvas.scaleFactor : 1f;
            _delay = true;
+            _mainEmitter = mainEmitter;

            canvasRenderer.SetTexture(null);

@@ -283,10 +283,6 @@ namespace Coffee.UIExtensions
                || !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");
@@ -298,13 +294,31 @@ namespace Coffee.UIExtensions
                return;
            }

+            // Reset custom data.
+            // var customData = _particleSystem.customData;
+            // if (!customData.enabled || customData.GetMode(ParticleSystemCustomData.Custom1) == ParticleSystemCustomDataMode.Disabled)
+            // {
+            //     customData.SetVector(ParticleSystemCustomData.Custom1, 0, 0);
+            //     customData.SetVector(ParticleSystemCustomData.Custom1, 1, 0);
+            //     customData.SetVector(ParticleSystemCustomData.Custom1, 2, 0);
+            //     customData.SetVector(ParticleSystemCustomData.Custom1, 3, 0);
+            // }
+            //
+            // if (!customData.enabled || customData.GetMode(ParticleSystemCustomData.Custom2) == ParticleSystemCustomDataMode.Disabled)
+            // {
+            //     customData.SetVector(ParticleSystemCustomData.Custom2, 0, 0);
+            //     customData.SetVector(ParticleSystemCustomData.Custom2, 1, 0);
+            //     customData.SetVector(ParticleSystemCustomData.Custom2, 2, 0);
+            //     customData.SetVector(ParticleSystemCustomData.Custom2, 3, 0);
+            // }
+
            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 (!_isTrail && _parent.canSimulate && !_mainEmitter)
            {
 #if UNITY_EDITOR
                if (!Application.isPlaying)
@@ -315,6 +329,13 @@ namespace Coffee.UIExtensions
 #endif
                {
                    ResolveResolutionChange(psPos, scale);
+
+                    // fix: second and subsequent bursts not displayed when world simulation and non-looping. (#326)
+                    if (!_particleSystem.IsLocalSpace() && !main.loop && _particleSystem.time == 0)
+                    {
+                        _delay = true;
+                    }
+
                    Simulate(scale, _parent.isPaused || _delay);

                    if (_delay && !_parent.isPaused)
@@ -422,7 +443,7 @@ namespace Coffee.UIExtensions
                    workerMesh.LinearToGamma();
                }

-                var components = ListPool<Component>.Rent();
+                var components = InternalListPool<Component>.Rent();
                GetComponents(typeof(IMeshModifier), components);
                for (var i = 0; i < components.Count; i++)
                {
@@ -431,7 +452,7 @@ namespace Coffee.UIExtensions
 #pragma warning restore CS0618 // Type or member is obsolete
                }

-                ListPool<Component>.Return(ref components);
+                InternalListPool<Component>.Return(ref components);
            }

            Profiler.EndSample();
@@ -443,7 +464,7 @@ namespace Coffee.UIExtensions

            // Get grouped renderers.
            Profiler.BeginSample("[UIParticleRenderer] Set Mesh");
-            var renderers = ListPool<UIParticleRenderer>.Rent();
+            var renderers = InternalListPool<UIParticleRenderer>.Rent();
            if (_parent.useMeshSharing)
            {
                UIParticleUpdater.GetGroupedRenderers(_parent.groupId, _index, renderers);
@@ -460,7 +481,7 @@ namespace Coffee.UIExtensions
                r.canvasRenderer.SetMaterial(materialForRendering, 0);
            }

-            ListPool<UIParticleRenderer>.Return(ref renderers);
+            InternalListPool<UIParticleRenderer>.Return(ref renderers);

            if (_parent.canRender)
            {
@@ -543,6 +564,30 @@ namespace Coffee.UIExtensions
                    return Matrix4x4.Translate(psPos)
                           * Matrix4x4.Scale(scale);
                case ParticleSystemSimulationSpace.World:
+                    if (_isTrail)
+                    {
+                        return Matrix4x4.Translate(psPos)
+                               * Matrix4x4.Scale(scale)
+                               * Matrix4x4.Translate(-psPos);
+                    }
+
+                    if (_mainEmitter)
+                    {
+                        if (_mainEmitter.IsLocalSpace())
+                        {
+                            return Matrix4x4.Translate(psPos)
+                                   * Matrix4x4.Scale(scale)
+                                   * Matrix4x4.Translate(-psPos);
+                        }
+                        else
+                        {
+                            psPos = _particleSystem.transform.position - _mainEmitter.transform.position;
+                            return Matrix4x4.Translate(psPos)
+                                   * Matrix4x4.Scale(scale)
+                                   * Matrix4x4.Translate(-psPos);
+                        }
+                    }
+
                    return Matrix4x4.Scale(scale);
                case ParticleSystemSimulationSpace.Custom:
                    return Matrix4x4.Translate(_particleSystem.main.customSimulationSpace.position.GetScaled(scale))
@@ -605,6 +650,7 @@ namespace Coffee.UIExtensions
                : main.useUnscaledTime
                    ? Time.unscaledDeltaTime
                    : Time.deltaTime;
+            deltaTime *= _parent.timeScaleMultiplier;

            // Pre-warm:
            if (0 < deltaTime && _preWarm)
@@ -685,7 +731,7 @@ namespace Coffee.UIExtensions
            if (s_Mpb.isEmpty) return;

            // #41: Copy the value from MaterialPropertyBlock to CanvasRenderer
-            if (!materialForRendering) return;
+            if (materialForRendering == null) return;

            for (var i = 0; i < _parent.m_AnimatableProperties.Length; i++)
            {
--- a/Runtime/UIParticleRenderer.cs.meta
+++ b/Runtime/UIParticleRenderer.cs.meta
@@ -5,7 +5,7 @@ MonoImporter:
  serializedVersion: 2
  defaultReferences: []
  executionOrder: 0
-  icon: {fileID: 2800000, guid: 5f0675613942149309588d556e33d990, type: 3}
+  icon: {instanceID: 0}
  userData: 
  assetBundleName: 
  assetBundleVariant: 
--- a/Runtime/UIParticleUpdater.cs
+++ b/Runtime/UIParticleUpdater.cs
@@ -16,37 +16,50 @@ namespace Coffee.UIExtensions

        public static void Register(UIParticle particle)
        {
-            if (!particle) return;
+            if (particle == null) return;
            s_ActiveParticles.Add(particle);
        }

        public static void Unregister(UIParticle particle)
        {
-            if (!particle) return;
+            if (particle == null) return;
            s_ActiveParticles.Remove(particle);
        }

        public static void Register(UIParticleAttractor attractor)
        {
-            if (!attractor) return;
+            if (attractor == null) return;
            s_ActiveAttractors.Add(attractor);
        }

        public static void Unregister(UIParticleAttractor attractor)
        {
-            if (!attractor) return;
+            if (attractor == null) return;
            s_ActiveAttractors.Remove(attractor);
        }

 #if UNITY_EDITOR
        [InitializeOnLoadMethod]
+        private static void InitializeOnLoad()
+        {
+            UIExtraCallbacks.onAfterCanvasRebuild += Refresh;
+
+            EditorApplication.playModeStateChanged += state =>
+            {
+                UIExtraCallbacks.onAfterCanvasRebuild -= Refresh;
+                if (state == PlayModeStateChange.EnteredEditMode || state == PlayModeStateChange.EnteredPlayMode)
+                {
+                    UIExtraCallbacks.onAfterCanvasRebuild += Refresh;
+                }
+            };
+        }
 #else
        [RuntimeInitializeOnLoadMethod(RuntimeInitializeLoadType.BeforeSceneLoad)]
-#endif
        private static void InitializeOnLoad()
        {
            UIExtraCallbacks.onAfterCanvasRebuild += Refresh;
        }
+#endif

        private static void Refresh()
        {
@@ -58,7 +71,7 @@ namespace Coffee.UIExtensions
            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;
+                if (uip == null || uip.canvas == null || !uip.isPrimary || !s_UpdatedGroupIds.Add(uip.groupId)) continue;

                uip.UpdateTransformScale();
                uip.UpdateRenderers();
@@ -68,7 +81,7 @@ namespace Coffee.UIExtensions
            for (var i = 0; i < s_ActiveParticles.Count; i++)
            {
                var uip = s_ActiveParticles[i];
-                if (!uip || !uip.canvas) continue;
+                if (uip == null || uip.canvas == null) continue;

                uip.UpdateTransformScale();

@@ -112,7 +125,7 @@ namespace Coffee.UIExtensions
                var uip = s_ActiveParticles[i];
                if (!uip.useMeshSharing || uip.groupId != groupId) continue;
                if (uip.isPrimary) return uip;
-                if (!primary && uip.canSimulate) primary = uip;
+                if (primary == null && uip.canSimulate) primary = uip;
            }

            return primary;
--- a/Runtime/Utilities/ParticleSystemExtensions.cs
+++ b/Runtime/Utilities/ParticleSystemExtensions.cs
@@ -13,11 +13,7 @@ namespace Coffee.UIParticleInternal
        {
            if (s_TmpParticles.Length < size)
            {
-                while (s_TmpParticles.Length < size)
-                {
-                    size = Mathf.NextPowerOfTwo(size);
-                }
-
+                size = Mathf.NextPowerOfTwo(size);
                s_TmpParticles = new ParticleSystem.Particle[size];
            }

@@ -88,11 +84,11 @@ namespace Coffee.UIParticleInternal
                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;
+                var aMat = aRenderer.sharedMaterial != null ? aRenderer.sharedMaterial : aRenderer.trailMaterial;
+                var bMat = bRenderer.sharedMaterial != null ? bRenderer.sharedMaterial : bRenderer.trailMaterial;
+                if (aMat == null && bMat == null) return 0;
+                if (aMat == null) return -1;
+                if (bMat == null) return 1;

                if (sortByMaterial)
                {
@@ -146,7 +142,7 @@ namespace Coffee.UIParticleInternal

        public static Texture2D GetTextureForSprite(this ParticleSystem self)
        {
-            if (!self) return null;
+            if (self == null) return null;

            // Get sprite's texture.
            var tsaModule = self.textureSheetAnimation;
@@ -155,7 +151,7 @@ namespace Coffee.UIParticleInternal
            for (var i = 0; i < tsaModule.spriteCount; i++)
            {
                var sprite = tsaModule.GetSprite(i);
-                if (!sprite) continue;
+                if (sprite == null) continue;

                return sprite.GetActualTexture();
            }
@@ -167,9 +163,38 @@ namespace Coffee.UIParticleInternal
        {
            foreach (var p in self)
            {
-                if (!p) continue;
+                if (p == null) continue;
                action.Invoke(p);
            }
        }
+
+        public static ParticleSystem GetMainEmitter(this ParticleSystem self, List<ParticleSystem> list)
+        {
+            if (self == null || list == null || list.Count == 0) return null;
+
+            for (var i = 0; i < list.Count; i++)
+            {
+                var parent = list[i];
+                if (parent != self && IsSubEmitterOf(self, parent)) return parent;
+            }
+
+            return null;
+        }
+
+        public static bool IsSubEmitterOf(this ParticleSystem self, ParticleSystem parent)
+        {
+            if (self == null || parent == null) return false;
+
+            var subEmitters = parent.subEmitters;
+            if (!subEmitters.enabled) return false; // No sub emitters.
+
+            var count = subEmitters.subEmittersCount;
+            for (var i = 0; i < count; i++)
+            {
+                if (subEmitters.GetSubEmitterSystem(i) == self) return true;
+            }
+
+            return false;
+        }
    }
 }
--- a/Samples~/Demo/Scripts/CopyItemOnStart.cs
+++ b/Samples~/Demo/Scripts/CopyItemOnStart.cs
@@ -15,7 +15,7 @@ namespace Coffee.UIExtensions.Demo

        private void Start()
        {
-            if (!m_Origin) return;
+            if (m_Origin == null) return;
            m_Origin.SetActive(false);

            var parent = m_Origin.transform.parent;
--- a/Samples~/Demo/Scripts/UIElementDragger.cs
+++ b/Samples~/Demo/Scripts/UIElementDragger.cs
@@ -42,7 +42,7 @@ public class UIElementDragger : MonoBehaviour, IBeginDragHandler, IDragHandler,
                break;
            case Target.Custom:
                _rectTransform.localPosition += delta;
-                if (m_CustomTarget)
+                if (m_CustomTarget != null)
                {
                    if (m_UseCanvasScale)
                    {
--- a/Samples~/Demo/Scripts/UIParticle_Demo.cs
+++ b/Samples~/Demo/Scripts/UIParticle_Demo.cs
@@ -1,3 +1,4 @@
+using Coffee.UIParticleInternal;
 using UnityEngine;
 using UnityEngine.Serialization;
 using UnityEngine.UI;
@@ -51,11 +52,7 @@ namespace Coffee.UIExtensions.Demo

        public void EnableAnimations(bool flag)
        {
-#if UNITY_2023_1_OR_NEWER
-            foreach (var animator in FindObjectsByType<Animator>(FindObjectsInactive.Include, FindObjectsSortMode.None))
-#else
-            foreach (var animator in FindObjectsOfType<Animator>())
-#endif
+            foreach (var animator in Misc.FindObjectsOfType<Animator>())
            {
                animator.enabled = flag;
            }
@@ -83,11 +80,7 @@ namespace Coffee.UIExtensions.Demo

        public void UIParticle_Scale(float scale)
        {
-#if UNITY_2023_1_OR_NEWER
-            foreach (var uip in FindObjectsByType<UIParticle>(FindObjectsInactive.Include, FindObjectsSortMode.None))
-#else
-            foreach (var uip in FindObjectsOfType<UIParticle>())
-#endif
+            foreach (var uip in Misc.FindObjectsOfType<UIParticle>())
            {
                uip.scale = scale;
            }
@@ -95,11 +88,7 @@ namespace Coffee.UIExtensions.Demo

        public void ParticleSystem_WorldSpaseSimulation(bool flag)
        {
-#if UNITY_2023_1_OR_NEWER
-            foreach (var p in FindObjectsByType<ParticleSystem>(FindObjectsInactive.Include, FindObjectsSortMode.None))
-#else
-            foreach (var p in FindObjectsOfType<ParticleSystem>())
-#endif
+            foreach (var p in Misc.FindObjectsOfType<ParticleSystem>())
            {
                var main = p.main;
                main.simulationSpace = flag
@@ -135,11 +124,7 @@ namespace Coffee.UIExtensions.Demo

        public void ParticleSystem_SetScale(float scale)
        {
-#if UNITY_2023_1_OR_NEWER
-            foreach (var ps in FindObjectsByType<ParticleSystem>(FindObjectsInactive.Include, FindObjectsSortMode.None))
-#else
-            foreach (var ps in FindObjectsOfType<ParticleSystem>())
-#endif
+            foreach (var ps in Misc.FindObjectsOfType<ParticleSystem>())
            {
                ps.transform.localScale = new Vector3(scale, scale, scale);
            }
--- a/package.json
+++ b/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": "4.10.0",
+  "version": "4.12.1",
  "unity": "2018.2",
  "license": "MIT",
  "repository": {
Author	SHA1	Message	Date
semantic-release-bot	92fb173507	chore(release): 4.12.1 [skip ci] ## [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`](`031d46a321`))	2026-03-24 08:53:33 +00:00
mob-sakai	298dc9a093	fix: ignore "EditorOnly" tagged gameObjects on refresh	2026-03-24 17:53:01 +09:00
semantic-release-bot	143face565	chore(release): 4.12.0 [skip ci] # [4.12.0](https://github.com/mob-sakai/ParticleEffectForUGUI/compare/v4.11.4...v4.12.0) (2026-03-24) ### Features * explicit null checks ([`5384f61`](`5384f61c56`))	2026-03-24 08:34:58 +00:00
mob-sakai	319ab5fe06	feat: explicit null checks	2026-03-24 17:32:31 +09:00
semantic-release-bot	04c1ca72cd	chore(release): 4.11.4 [skip ci] ## [4.11.4](https://github.com/mob-sakai/ParticleEffectForUGUI/compare/v4.11.3...v4.11.4) (2025-12-24) ### Bug Fixes * add early return for case where subEmitter module is disabled ([`d1386a1`](`d1386a1221`)) * avoid endless loop ([`eb2e862`](`eb2e862e80`)), closes [#392](https://github.com/mob-sakai/ParticleEffectForUGUI/issues/392)	2025-12-24 11:17:10 +00:00
mob-sakai	f2df47aeec	fix: avoid endless loop close #392	2025-12-24 20:10:01 +09:00
mob-sakai	1dfd756721	fix: add early return for case where subEmitter module is disabled	2025-12-05 09:58:23 +09:00
semantic-release-bot	c54f63cb18	chore(release): 4.11.3 [skip ci] ## [4.11.3](https://github.com/mob-sakai/ParticleEffectForUGUI/compare/v4.11.2...v4.11.3) (2025-10-14) ### Bug Fixes * fix icon ([`a9461ec`](`a9461ecb4d`)) * fix URL link in README ([`1c8c65d`](`1c8c65d25e`)), closes [#376](https://github.com/mob-sakai/ParticleEffectForUGUI/issues/376) * fix: second and subsequent bursts not displayed when world simulation and non-looping ([`df2f3ca`](`df2f3caafb`)), closes [#326](https://github.com/mob-sakai/ParticleEffectForUGUI/issues/326) * UIParticle in canvas with 0f-0.01f alpha value does not start to play until alpha value is greater than 0.01f, causes play calls to be delayed unintentionally if canvas alpha value is set to mentioned value range ([`38aec2e`](`38aec2ea1a`))	2025-10-14 11:53:52 +00:00
mob-sakai	7fb6cda06d	fix: fix: second and subsequent bursts not displayed when world simulation and non-looping close #326	2025-10-14 19:43:29 +09:00
mob-sakai	9441f4100c	fix: fix URL link in README close #376	2025-08-08 17:57:40 +09:00
mob-sakai	ba95fe74ad	fix: fix icon	2025-06-14 09:41:44 +09:00
Serkan Şenkal	4532e358db	fix: UIParticle in canvas with 0f-0.01f alpha value does not start to play until alpha value is greater than 0.01f, causes play calls to be delayed unintentionally if canvas alpha value is set to mentioned value range	2025-04-09 02:59:26 +09:00
semantic-release-bot	4b98abd746	chore(release): 4.11.2 [skip ci] ## [4.11.2](https://github.com/mob-sakai/ParticleEffectForUGUI/compare/v4.11.1...v4.11.2) (2025-03-15) ### Bug Fixes * IL2CPP build fails on older versions of Unity ([`0da6525`](`0da652520c`)) * NRE on enable ([`0cff50e`](`0cff50ef69`)), closes [#359](https://github.com/mob-sakai/ParticleEffectForUGUI/issues/359)	2025-03-15 07:59:37 +00:00
mob-sakai	63ec8f61e3	fix: NRE on enable close #359	2025-03-14 19:44:02 +09:00
mob-sakai	29eebf79fa	fix: IL2CPP build fails on older versions of Unity	2025-03-14 19:29:41 +09:00
mob-sakai	4b6da7c218	chore: fix settings icon	2025-03-14 19:24:22 +09:00
semantic-release-bot	7ea0a436d1	chore(release): 4.11.1 [skip ci] ## [4.11.1](https://github.com/mob-sakai/ParticleEffectForUGUI/compare/v4.11.0...v4.11.1) (2025-02-21) ### Bug Fixes * component icons will no longer be displayed in the scene view ([`6dfbdae`](`6dfbdae38d`))	2025-02-21 09:35:05 +00:00
mob-sakai	803af8113d	fix: component icons will no longer be displayed in the scene view	2025-02-21 18:22:24 +09:00
mob-sakai	8b5f7ff57e	doc: update readme	2025-02-21 17:57:12 +09:00
semantic-release-bot	3d0284c630	chore(release): 4.11.0 [skip ci] # [4.11.0](https://github.com/mob-sakai/ParticleEffectForUGUI/compare/v4.10.7...v4.11.0) (2025-02-21) ### Features * add 'TimeScaleMultiplier' option ([`925af0b`](`925af0b604`))	2025-02-21 07:17:09 +00:00
mob-sakai	9832485c04	feat: add 'TimeScaleMultiplier' option	2025-02-21 16:10:06 +09:00
semantic-release-bot	201bd9180e	chore(release): 4.10.7 [skip ci] ## [4.10.7](https://github.com/mob-sakai/ParticleEffectForUGUI/compare/v4.10.6...v4.10.7) (2025-01-14) ### Bug Fixes * editor crashed on exit play mode (editor, windows) ([`47ee45c`](`47ee45cbbe`)), closes [#351](https://github.com/mob-sakai/ParticleEffectForUGUI/issues/351)	2025-01-14 11:49:21 +00:00
mob-sakai	12d604fedd	fix: editor crashed on exit play mode (editor, windows) close #351	2025-01-07 10:25:23 +09:00
semantic-release-bot	4f42996514	chore(release): 4.10.6 [skip ci] ## [4.10.6](https://github.com/mob-sakai/ParticleEffectForUGUI/compare/v4.10.5...v4.10.6) (2025-01-03) ### Bug Fixes * sub-emitter particles may not render correctly in certain scenarios ([`8276684`](`8276684c3b`)), closes [#348](https://github.com/mob-sakai/ParticleEffectForUGUI/issues/348) * sub-emitter's `inherit velocity` module doubles at runtime ([`67de3d1`](`67de3d1bd3`)), closes [#349](https://github.com/mob-sakai/ParticleEffectForUGUI/issues/349)	2025-01-03 14:24:40 +00:00
mob-sakai	a0a2f4aece	chore: update coffee.internal	2025-01-03 23:13:17 +09:00
mob-sakai	23cd448766	fix: sub-emitter particles may not render correctly in certain scenarios close #348	2025-01-03 23:13:17 +09:00
mob-sakai	1c33dac125	fix: sub-emitter's `inherit velocity` module doubles at runtime close #349	2025-01-03 23:13:17 +09:00
semantic-release-bot	f4b28b68b1	chore(release): 4.10.5 [skip ci] ## [4.10.5](https://github.com/mob-sakai/ParticleEffectForUGUI/compare/v4.10.4...v4.10.5) (2024-12-23) ### Bug Fixes * '3D' scale toggle in the inspector does not keep on reload ([`934f4b8`](`934f4b8f1c`)), closes [#346](https://github.com/mob-sakai/ParticleEffectForUGUI/issues/346)	2024-12-23 03:54:11 +00:00
mob-sakai	ff179f0271	refactor: update coffee.internal	2024-12-23 12:53:15 +09:00
mob-sakai	abdf260352	fix: '3D' scale toggle in the inspector does not keep on reload close #346	2024-12-22 13:10:21 +09:00
semantic-release-bot	847af6397e	chore(release): 4.10.4 [skip ci] ## [4.10.4](https://github.com/mob-sakai/ParticleEffectForUGUI/compare/v4.10.3...v4.10.4) (2024-12-19) ### Bug Fixes * rendering issues when playing with opening a prefab stage ([`95235a9`](`95235a929b`)), closes [#345](https://github.com/mob-sakai/ParticleEffectForUGUI/issues/345)	2024-12-19 08:50:19 +00:00
mob-sakai	ac3e147bd9	fix: rendering issues when playing with opening a prefab stage close #345	2024-12-18 19:46:32 +09:00
semantic-release-bot	598c85e0f4	chore(release): 4.10.3 [skip ci] ## [4.10.3](https://github.com/mob-sakai/ParticleEffectForUGUI/compare/v4.10.2...v4.10.3) (2024-11-20) ### Bug Fixes * if not configured as a preloaded asset, the project settings asset will be regenerated ([`abe0948`](`abe09485f6`)), closes [#342](https://github.com/mob-sakai/ParticleEffectForUGUI/issues/342)	2024-11-20 16:56:36 +00:00
mob-sakai	5f479902aa	fix: if not configured as a preloaded asset, the project settings asset will be regenerated close #342	2024-11-21 01:39:16 +09:00
mob-sakai	2a66393cb0	refactor: update coffee.internal	2024-11-21 01:36:51 +09:00
semantic-release-bot	2b3cec69ac	chore(release): 4.10.2 [skip ci] ## [4.10.2](https://github.com/mob-sakai/ParticleEffectForUGUI/compare/v4.10.1...v4.10.2) (2024-11-01) ### Bug Fixes * trail incorrect offset ([`afe00a1`](`afe00a1dde`)), closes [#335](https://github.com/mob-sakai/ParticleEffectForUGUI/issues/335)	2024-11-01 02:15:40 +00:00
Jie	a4dd8c5776	fix: trail incorrect offset close #335	2024-11-01 11:14:03 +09:00
mob-sakai	dd94bba43c	refactor	2024-09-30 03:01:48 +09:00
semantic-release-bot	2e813c5313	chore(release): 4.10.1 [skip ci] ## [4.10.1](https://github.com/mob-sakai/ParticleEffectForUGUI/compare/v4.10.0...v4.10.1) (2024-09-29) ### Bug Fixes * mainTex will be ignored ([`2ee69d0`](`2ee69d0424`))	2024-09-29 17:46:35 +00:00
mob-sakai	1b61904018	fix: mainTex will be ignored	2024-09-30 02:36:45 +09:00