diff --git a/Editor/AnimatablePropertyEditor.cs b/Editor/AnimatablePropertyEditor.cs
index 9e28284..38bdec9 100644
--- 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++)
                 {
diff --git a/Editor/UIParticleEditor.cs b/Editor/UIParticleEditor.cs
index 0cffc98..2a06548 100644
--- a/Editor/UIParticleEditor.cs
+++ b/Editor/UIParticleEditor.cs
@@ -110,7 +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;
                     }
@@ -124,7 +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;
@@ -191,7 +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();
@@ -267,7 +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/"))
                 {
@@ -286,7 +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;
 
diff --git a/Runtime/Internal/Extensions/ComponentExtensions.cs b/Runtime/Internal/Extensions/ComponentExtensions.cs
index e9ec78b..82314bf 100644
--- a/Runtime/Internal/Extensions/ComponentExtensions.cs
+++ b/Runtime/Internal/Extensions/ComponentExtensions.cs
@@ -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>();
@@ -166,7 +166,7 @@ namespace Coffee.UIParticleInternal
 #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;
@@ -184,9 +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>
diff --git a/Runtime/Internal/Extensions/SpriteExtensions.cs b/Runtime/Internal/Extensions/SpriteExtensions.cs
index 9e3d1c2..478805d 100644
--- a/Runtime/Internal/Extensions/SpriteExtensions.cs
+++ b/Runtime/Internal/Extensions/SpriteExtensions.cs
@@ -32,10 +32,10 @@ namespace Coffee.UIParticleInternal
         /// </summary>
         public static Texture2D GetActualTexture(this Sprite self)
         {
-            if (!self) return null;
+            if (self == null) return null;
 
             var ret = s_GetActiveAtlasTextureMethod(self);
-            return ret ? ret : self.texture;
+            return ret != null ? ret : self.texture;
         }
 
         /// <summary>
@@ -43,7 +43,7 @@ namespace Coffee.UIParticleInternal
         /// </summary>
         public static SpriteAtlas GetActiveAtlas(this Sprite self)
         {
-            if (!self) return null;
+            if (self == null) return null;
 
             return s_GetActiveAtlasMethod(self);
         }
@@ -53,7 +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
     }
diff --git a/Runtime/Internal/ProjectSettings/PreloadedProjectSettings.cs b/Runtime/Internal/ProjectSettings/PreloadedProjectSettings.cs
index 7f5326a..2f469cb 100644
--- a/Runtime/Internal/ProjectSettings/PreloadedProjectSettings.cs
+++ b/Runtime/Internal/ProjectSettings/PreloadedProjectSettings.cs
@@ -37,7 +37,7 @@ namespace Coffee.UIParticleInternal
             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 = CreateInstance(t) as PreloadedProjectSettings;
@@ -48,7 +48,7 @@ namespace Coffee.UIParticleInternal
                     SetDefaultSettings(defaultSettings);
                 }
 
-                if (defaultSettings)
+                if (defaultSettings != null)
                 {
                     defaultSettings.OnInitialize();
                 }
@@ -66,7 +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();
         }
 
@@ -76,12 +76,12 @@ 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)))
@@ -103,7 +103,7 @@ namespace Coffee.UIParticleInternal
             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()
@@ -133,19 +133,19 @@ namespace Coffee.UIParticleInternal
 #if UNITY_EDITOR
         private string _jsonText;
 
-        public static bool hasInstance => s_Instance;
+        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;
@@ -174,7 +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>
@@ -183,7 +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);
@@ -193,7 +193,7 @@ namespace Coffee.UIParticleInternal
             EditorApplication.playModeStateChanged += OnPlayModeStateChanged;
 #endif
 
-            if (s_Instance) return;
+            if (s_Instance != null) return;
             s_Instance = this as T;
         }
 
@@ -222,7 +222,7 @@ namespace Coffee.UIParticleInternal
 
             public override void OnGUI(string searchContext)
             {
-                if (!_target)
+                if (_target == null)
                 {
                     if (_editor)
                     {
diff --git a/Runtime/Internal/Utilities/Logging.cs b/Runtime/Internal/Utilities/Logging.cs
index 1eec46d..12c5b79 100644
--- 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
diff --git a/Runtime/Internal/Utilities/Misc.cs b/Runtime/Internal/Utilities/Misc.cs
index 4eac3d8..58769e9 100644
--- a/Runtime/Internal/Utilities/Misc.cs
+++ b/Runtime/Internal/Utilities/Misc.cs
@@ -29,7 +29,7 @@ namespace Coffee.UIParticleInternal
 
         public static void Destroy(Object obj)
         {
-            if (!obj) return;
+            if (obj == null) return;
 #if UNITY_EDITOR
             if (!Application.isPlaying)
             {
@@ -44,7 +44,7 @@ namespace Coffee.UIParticleInternal
 
         public static void DestroyImmediate(Object obj)
         {
-            if (!obj) return;
+            if (obj == null) return;
 #if UNITY_EDITOR
             if (Application.isEditor)
             {
@@ -61,7 +61,7 @@ namespace Coffee.UIParticleInternal
         public static void SetDirty(Object obj)
         {
 #if UNITY_EDITOR
-            if (!obj) return;
+            if (obj == null) return;
             EditorUtility.SetDirty(obj);
 #endif
         }
@@ -117,11 +117,11 @@ namespace Coffee.UIParticleInternal
             foreach (var type in types)
             {
                 var script = scripts.FirstOrDefault(x => x.GetClass() == type);
-                if (!script) continue;
+                if (script == null) continue;
 
                 var path = type.GetCustomAttribute<IconAttribute>()?._path;
                 var icon = AssetDatabase.LoadAssetAtPath<Texture2D>(path);
-                if (!icon) continue;
+                if (icon == null) continue;
 
                 s_SetIconForObject(script, icon);
             }
diff --git a/Runtime/Internal/Utilities/ObjectRepository.cs b/Runtime/Internal/Utilities/ObjectRepository.cs
index 46213cf..9797789 100644
--- 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);
                 }
diff --git a/Runtime/UIParticle.cs b/Runtime/UIParticle.cs
index 5c0e4f7..b90a309 100644
--- a/Runtime/UIParticle.cs
+++ b/Runtime/UIParticle.cs
@@ -471,7 +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);
             }
         }
@@ -489,7 +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++)
@@ -518,7 +518,7 @@ namespace Coffee.UIExtensions
         /// </summary>
         public void SetParticleSystemPrefab(GameObject prefab)
         {
-            if (!prefab) return;
+            if (prefab == null) return;
 
             SetParticleSystemInstance(Instantiate(prefab.gameObject), true);
         }
@@ -538,7 +538,7 @@ 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--)
             {
@@ -591,7 +591,7 @@ namespace Coffee.UIExtensions
             for (var i = 0; i < particleSystems.Count; i++)
             {
                 var ps = particleSystems[i];
-                if (!ps) continue;
+                if (ps == null) continue;
 
                 var mainEmitter = ps.GetMainEmitter(particleSystems);
                 GetRenderer(j++).Set(this, ps, false, mainEmitter);
@@ -642,7 +642,7 @@ 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;
@@ -652,7 +652,7 @@ 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);
             }
@@ -681,7 +681,7 @@ 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();
             }
@@ -694,7 +694,7 @@ namespace Coffee.UIExtensions
                 _renderers.Add(UIParticleRenderer.AddRenderer(this, index));
             }
 
-            if (!_renderers[index])
+            if (_renderers[index] == null)
             {
                 _renderers[index] = UIParticleRenderer.AddRenderer(this, index);
             }
@@ -704,13 +704,13 @@ 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;
@@ -729,7 +729,7 @@ namespace Coffee.UIExtensions
             }
 
             // Create baking camera.
-            if (!_bakeCamera)
+            if (_bakeCamera == null)
             {
                 var go = new GameObject("[generated] UIParticle BakingCamera");
                 go.SetActive(false);
diff --git a/Runtime/UIParticleAttractor.cs b/Runtime/UIParticleAttractor.cs
index 0f5a73f..7cbf248 100644
--- 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;
diff --git a/Runtime/UIParticleRenderer.cs b/Runtime/UIParticleRenderer.cs
index 92cf049..814c137 100644
--- a/Runtime/UIParticleRenderer.cs
+++ b/Runtime/UIParticleRenderer.cs
@@ -55,7 +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)
@@ -95,7 +95,7 @@ namespace Coffee.UIExtensions
         {
             get
             {
-                if (!_materialForRendering)
+                if (_materialForRendering == null)
                 {
                     _materialForRendering = base.materialForRendering;
                 }
@@ -106,7 +106,7 @@ namespace Coffee.UIExtensions
 
         public void Reset(int index = -1)
         {
-            if (_renderer)
+            if (_renderer != null)
             {
                 _renderer.enabled = true;
             }
@@ -121,7 +121,7 @@ namespace Coffee.UIExtensions
             }
 
             //_emitter = null;
-            if (this && isActiveAndEnabled)
+            if (isActiveAndEnabled)
             {
                 material = null;
                 canvasRenderer.Clear();
@@ -140,7 +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
                 {
@@ -294,6 +294,24 @@ 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;
@@ -713,7 +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++)
             {
diff --git a/Runtime/UIParticleUpdater.cs b/Runtime/UIParticleUpdater.cs
index 2e353e9..d82f485 100644
--- a/Runtime/UIParticleUpdater.cs
+++ b/Runtime/UIParticleUpdater.cs
@@ -16,25 +16,25 @@ 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);
         }
 
@@ -71,7 +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();
@@ -81,7 +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();
 
@@ -125,7 +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;
diff --git a/Runtime/Utilities/ParticleSystemExtensions.cs b/Runtime/Utilities/ParticleSystemExtensions.cs
index 7fec948..ee59b7d 100644
--- a/Runtime/Utilities/ParticleSystemExtensions.cs
+++ b/Runtime/Utilities/ParticleSystemExtensions.cs
@@ -84,11 +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)
                 {
@@ -142,7 +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;
@@ -151,7 +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();
             }
@@ -163,14 +163,14 @@ 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 || list == null || list.Count == 0) return null;
+            if (self == null || list == null || list.Count == 0) return null;
 
             for (var i = 0; i < list.Count; i++)
             {
@@ -183,7 +183,7 @@ namespace Coffee.UIParticleInternal
 
         public static bool IsSubEmitterOf(this ParticleSystem self, ParticleSystem parent)
         {
-            if (!self || !parent) return false;
+            if (self == null || parent == null) return false;
 
             var subEmitters = parent.subEmitters;
             if (!subEmitters.enabled) return false; // No sub emitters.
diff --git a/Samples~/Demo/Scripts/CopyItemOnStart.cs b/Samples~/Demo/Scripts/CopyItemOnStart.cs
index 0b8af5b..38d667a 100644
--- 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;
diff --git a/Samples~/Demo/Scripts/UIElementDragger.cs b/Samples~/Demo/Scripts/UIElementDragger.cs
index 28d7b3f..bf38fae 100644
--- 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)
                     {