[SDK-926] feat: added optional parameter to filter meshes (#267)

- improved GetMeshRenderer function to optionally ignore null meshes
- added function to enable updating the head mesh on EyeAnimationHandler

Author: HarrisonHough

Runtime/Core/Scripts/Animation/EyeAnimationHandler.cs

@@ -81,8 +81,7 @@ public void Initialize()
         /// </summary>
         private void Awake()
         {
-            headMesh = gameObject.GetMeshRenderer(MeshType.HeadMesh);
-            hasBlinkBlendShapes = HasBlinkBlendshapes();
+            UpdateHeadMesh();
             ValidateSkeleton();
 
             if (!hasBlinkBlendShapes)
@@ -101,6 +100,12 @@ private void Awake()
             }
         }
 
+        public void UpdateHeadMesh()
+        {
+            headMesh = gameObject.GetMeshRenderer(MeshType.HeadMesh, true);
+            HasBlinkBlendshapes();
+        }
+
         private bool HasBlinkBlendshapes()
         {
             eyeBlinkLeftBlendShapeIndex = headMesh.sharedMesh.GetBlendShapeIndex(EYE_BLINK_LEFT_BLEND_SHAPE_NAME);

Runtime/Core/Scripts/Extensions/ExtensionMethods.cs

@@ -56,12 +56,16 @@ public static void SaveToFile(this AvatarMetadata metadata, string guid, string
         /// </summary>
         /// <param name="gameObject">The <see cref="GameObject" /> to search for a <see cref="SkinnedMeshRenderer" />.</param>
         /// <param name="meshType">Determines the <see cref="MeshType" /> to search for.</param>
+        /// <param name="ignoreNullMesh">If true it will filter our <see cref="SkinnedMeshRenderers"/> with NO mesh data.</param>
         /// <returns>The <see cref="SkinnedMeshRenderer" /> if found.</returns>
-        public static SkinnedMeshRenderer GetMeshRenderer(this GameObject gameObject, MeshType meshType)
+        public static SkinnedMeshRenderer GetMeshRenderer(this GameObject gameObject, MeshType meshType, bool ignoreNullMesh = false)
         {
             SkinnedMeshRenderer mesh;
-            List<SkinnedMeshRenderer> children = gameObject.GetComponentsInChildren<SkinnedMeshRenderer>().ToList();
-
+            var children = gameObject.GetComponentsInChildren<SkinnedMeshRenderer>().ToList();
+            if (ignoreNullMesh)
+            {
+                children = children.Where(renderer => renderer.sharedMesh != null).ToList();
+            }
             if (children.Count == 0)
             {