fix: AvatarMask is not mapped

CHANGELOG-PRERELEASE.md

@@ -16,6 +16,7 @@ The format is based on [Keep a Changelog].
 ### Removed
 
 ### Fixed
+- AvatarMask broken with many cases `#502`
 
 ### Security
 

Editor/ObjectMapping/AnimationObjectMapper.cs

@@ -84,6 +84,40 @@ public MappedGameObjectInfo(ObjectMapping objectMapping, string newPath,
             }
         }
 
+        [CanBeNull]
+        public string MapPath(string srcPath, Type type)
+        {
+            var gameObjectInfo = GetGameObjectInfo(srcPath);
+            if (gameObjectInfo == null) return srcPath;
+            var (instanceId, componentInfo) = gameObjectInfo.GetComponentByType(type);
+
+            if (componentInfo != null)
+            {
+                var component = EditorUtility.InstanceIDToObject(componentInfo.MergedInto) as Component;
+                // there's mapping about component.
+                // this means the component is merged or some prop has mapping
+                if (!component) return null; // this means removed.
+
+                var newPath = Utils.RelativePath(_rootGameObject.transform, component.transform);
+                if (newPath == null) return null; // this means moved to out of the animator scope
+
+                return newPath;
+            }
+            else
+            {
+                // The component is not merged & no prop mapping so process GameObject mapping
+
+                if (type != typeof(GameObject))
+                {
+                    var component = EditorUtility.InstanceIDToObject(instanceId) as Component;
+                    if (!component) return null; // this means removed
+                }
+
+                if (gameObjectInfo.NewPath == null) return null;
+                return gameObjectInfo.NewPath;
+            }
+        }
+
         public EditorCurveBinding MapBinding(EditorCurveBinding binding)
         {
             var gameObjectInfo = GetGameObjectInfo(binding.path);

Editor/Processors/ApplyObjectMapping.cs

@@ -167,7 +167,7 @@ private AnimatorControllerLayer MapAnimatorControllerLayer(AnimatorControllerLay
             new AnimatorControllerLayer
             {
                 name = layer.name,
-                avatarMask = layer.avatarMask,
+                avatarMask = DeepClone(layer.avatarMask, CustomClone),
                 blendingMode = layer.blendingMode,
                 defaultWeight = layer.defaultWeight,
                 syncedLayerIndex = layer.syncedLayerIndex,
@@ -215,6 +215,27 @@ private Object CustomClone(Object o)
 
                 return newClip;
             }
+            else if (o is AvatarMask mask)
+            {
+                var newMask = _session.AddToAsset(new AvatarMask());
+                newMask.name = "rebased " + mask.name;
+                newMask.transformCount = mask.transformCount;
+                var dstI = 0;
+                for (var srcI = 0; srcI < mask.transformCount; srcI++)
+                {
+                    var path = mask.GetTransformPath(srcI);
+                    var newPath = _mapping.MapPath(path, typeof(Transform));
+                    if (newPath != null)
+                    {
+                        newMask.SetTransformPath(dstI, newPath);
+                        newMask.SetTransformActive(dstI, mask.GetTransformActive(srcI));
+                        dstI++;
+                    }
+                }
+                newMask.transformCount = dstI;
+
+                return newMask;
+            }
             else
             {
                 return null;
@@ -239,6 +260,7 @@ private T DeepClone<T>(T original, Func<Object, Object> visitor) where T : Objec
                 case AnimatorStateMachine _:
                 case AnimatorTransitionBase _:
                 case StateMachineBehaviour _:
+                case AvatarMask _:
                     break; // We want to clone these types
 
                 // Leave textures, materials, and script definitions alone