fix/reimplement: scale adjuster results in infinite loops sometimes (#677)

Closes: #676

Editor/HarmonyPatches.meta

@@ -0,0 +1,3 @@
+fileFormatVersion: 2
+guid: cf056e4454ad43ababbfff1dd06ec1d0
+timeCreated: 1708235917

Editor/HarmonyPatches/HideScaleAdjusterFromPrefabOverrideView.cs

@@ -0,0 +1,59 @@
+#region
+
+using System;
+using System.Collections.Generic;
+using System.Collections.Immutable;
+using System.Linq;
+using System.Reflection;
+using HarmonyLib;
+using JetBrains.Annotations;
+using UnityEditor.SceneManagement;
+using UnityEngine;
+
+#endregion
+
+namespace nadena.dev.modular_avatar.core.editor.HarmonyPatches
+{
+    /// <summary>
+    /// Try to prevent various internal objects from showing up in the Prefab Overrides window...
+    /// </summary>
+    internal class HideScaleAdjusterFromPrefabOverrideView
+    {
+        internal static Type t_PrefabOverrides;
+        internal static PropertyInfo p_AddedGameObjects, p_ObjectOverrides;
+
+        internal static void Patch(Harmony harmony)
+        {
+            var t_PrefabOverridesTreeView = AccessTools.TypeByName("UnityEditor.PrefabOverridesTreeView");
+            var m_GetPrefabOverrides = AccessTools.Method(t_PrefabOverridesTreeView, "GetPrefabOverrides");
+
+            var m_postfix = AccessTools.Method(typeof(HideScaleAdjusterFromPrefabOverrideView), "Postfix");
+
+            t_PrefabOverrides = AccessTools.TypeByName("UnityEditor.PrefabOverridesTreeView+PrefabOverrides");
+            p_AddedGameObjects = AccessTools.Property(t_PrefabOverrides, "addedGameObjects");
+            p_ObjectOverrides = AccessTools.Property(t_PrefabOverrides, "objectOverrides");
+
+            harmony.Patch(original: m_GetPrefabOverrides, postfix: new HarmonyMethod(m_postfix));
+        }
+
+        [UsedImplicitly]
+        private static void Postfix(GameObject prefabInstance, object __result)
+        {
+            var ignoredObjects = prefabInstance.GetComponentsInChildren<ScaleAdjusterRenderer>()
+                .Select(sar => sar.gameObject)
+                .ToImmutableHashSet();
+            List<AddedGameObject> added = p_AddedGameObjects.GetValue(__result) as List<AddedGameObject>;
+
+            if (added == null) return;
+            added.RemoveAll(obj => ignoredObjects.Contains(obj.instanceGameObject));
+
+            List<ObjectOverride> objectOverrides = p_ObjectOverrides.GetValue(__result) as List<ObjectOverride>;
+            if (objectOverrides == null) return;
+            objectOverrides.RemoveAll(oo =>
+            {
+                var c = oo.instanceObject as Component;
+                return c != null && ignoredObjects.Contains(c.gameObject);
+            });
+        }
+    }
+}

Editor/HarmonyPatches/HideScaleAdjusterFromPrefabOverrideView.cs.meta

@@ -0,0 +1,3 @@
+fileFormatVersion: 2
+guid: 0893522c012a46358e5ecf1df6628b2e
+timeCreated: 1708237029

Editor/HarmonyPatches/PatchLoader.cs

@@ -0,0 +1,21 @@
+#region
+
+using HarmonyLib;
+using UnityEditor;
+
+#endregion
+
+namespace nadena.dev.modular_avatar.core.editor.HarmonyPatches
+{
+    internal class PatchLoader
+    {
+        [InitializeOnLoadMethod]
+        static void ApplyPatches()
+        {
+            var harmony = new Harmony("nadena.dev.modular_avatar");
+
+            SnoopHeaderRendering.Patch(harmony);
+            HideScaleAdjusterFromPrefabOverrideView.Patch(harmony);
+        }
+    }
+}

Editor/HarmonyPatches/PatchLoader.cs.meta

@@ -0,0 +1,3 @@
+fileFormatVersion: 2
+guid: e92aedf0fa324b8fb1b425a7fc2b1771
+timeCreated: 1708235934

Editor/HarmonyPatches/SnoopHeaderRendering.cs

@@ -0,0 +1,40 @@
+#region
+
+using HarmonyLib;
+using JetBrains.Annotations;
+using UnityEngine;
+
+#endregion
+
+namespace nadena.dev.modular_avatar.core.editor.HarmonyPatches
+{
+    /// <summary>
+    /// ScaleAdjusterRenderer toggles off the enabled state of the original mesh just before rendering,
+    /// in order to allow us to effectively replace it at rendering time. We restore this in OnPostRender,
+    /// but GUI rendering can happen before this; as such, snoop GUI events and re-enable the original
+    /// at that time.
+    /// </summary>
+    internal class SnoopHeaderRendering
+    {
+        internal static void Patch(Harmony harmony)
+        {
+            var t_orig = AccessTools.TypeByName("UnityEditor.UIElements.EditorElement");
+            var m_orig = AccessTools.Method(t_orig, "HeaderOnGUI");
+
+            var m_prefix = AccessTools.Method(typeof(SnoopHeaderRendering), "Prefix");
+
+            harmony.Patch(original: m_orig, prefix: new HarmonyMethod(m_prefix));
+
+            var t_GUIUtility = typeof(GUIUtility);
+            var m_ProcessEvent = AccessTools.Method(t_GUIUtility, "ProcessEvent");
+
+            harmony.Patch(original: m_ProcessEvent, prefix: new HarmonyMethod(m_prefix));
+        }
+
+        [UsedImplicitly]
+        private static void Prefix()
+        {
+            ScaleAdjusterRenderer.ClearAllOverrides();
+        }
+    }
+}

Editor/HarmonyPatches/SnoopHeaderRendering.cs.meta

@@ -0,0 +1,3 @@
+fileFormatVersion: 2
+guid: cafb5b7e681644cbbeafbeb12d833f6e
+timeCreated: 1708235926

Editor/HarmonyPatches/nadena.dev.modular-avatar.harmony-patches.asmdef

@@ -0,0 +1,28 @@
+{
+    "name": "nadena.dev.modular-avatar.harmony-patches",
+    "rootNamespace": "",
+    "references": [
+        "nadena.dev.modular-avatar.core",
+        "nadena.dev.modular-avatar.core.editor",
+        "VRC.SDKBase.Editor"
+    ],
+    "includePlatforms": [
+        "Editor"
+    ],
+    "excludePlatforms": [],
+    "allowUnsafeCode": false,
+    "overrideReferences": false,
+    "precompiledReferences": [],
+    "autoReferenced": true,
+    "defineConstraints": [
+        "VRCSDK_HAS_HARMONY"
+    ],
+    "versionDefines": [
+        {
+            "name": "com.vrchat.base",
+            "expression": "(3.4.999,)",
+            "define": "VRCSDK_HAS_HARMONY"
+        }
+    ],
+    "noEngineReferences": false
+}

Editor/HarmonyPatches/nadena.dev.modular-avatar.harmony-patches.asmdef.meta

@@ -0,0 +1,7 @@
+fileFormatVersion: 2
+guid: 0f9cfa335019051479cc80ce30c95a68
+AssemblyDefinitionImporter:
+  externalObjects: {}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 

Editor/PluginDefinition/PluginDefinition.cs

@@ -36,6 +36,7 @@ namespace nadena.dev.modular_avatar.core.editor.plugin
             {
                 seq.Run(ClearEditorOnlyTags.Instance);
                 seq.Run(MeshSettingsPluginPass.Instance);
+                seq.Run(ScaleAdjusterPass.Instance);
 #if MA_VRCSDK3_AVATARS
                 seq.Run(RenameParametersPluginPass.Instance);
                 seq.Run(MergeBlendTreePass.Instance);

Editor/ScaleAdjusterPass.cs

@@ -0,0 +1,51 @@
+using System.Collections.Generic;
+using System.Linq;
+using nadena.dev.ndmf;
+using UnityEditor.EditorTools;
+using UnityEngine;
+
+namespace nadena.dev.modular_avatar.core.editor
+{
+    internal class ScaleAdjusterPass : Pass<ScaleAdjusterPass>
+    {
+        protected override void Execute(ndmf.BuildContext context)
+        {
+            ScaleAdjusterRenderer.ClearAllOverrides();
+
+            Dictionary<Transform, Transform> boneMappings = new Dictionary<Transform, Transform>();
+            foreach (var component in context.AvatarRootObject.GetComponentsInChildren<ScaleProxy>())
+            {
+                var proxyTransform = component.transform;
+                var parentAdjuster = component.transform.parent?.GetComponent<ModularAvatarScaleAdjuster>();
+                if (parentAdjuster != null)
+                {
+                    UnityEngine.Object.DestroyImmediate(component);
+                    
+                    proxyTransform.localScale = parentAdjuster.Scale;
+                    UnityEngine.Object.DestroyImmediate(parentAdjuster);
+                
+                    boneMappings.Add(proxyTransform.parent, proxyTransform);
+                }
+            }
+                        
+            foreach (var sar in context.AvatarRootObject.GetComponentsInChildren<ScaleAdjusterRenderer>())
+            {
+                UnityEngine.Object.DestroyImmediate(sar.gameObject);
+            }
+            
+            foreach (var smr in context.AvatarRootObject.GetComponentsInChildren<SkinnedMeshRenderer>())
+            {
+                var bones = smr.bones;
+                for (int i = 0; i < bones.Length; i++)
+                {
+                    if (boneMappings.TryGetValue(bones[i], out var newBone))
+                    {
+                        bones[i] = newBone;
+                    }
+                }
+                smr.bones = bones;
+            }
+
+        }
+    }
+}

Editor/ScaleAdjusterPass.cs.meta

@@ -0,0 +1,3 @@
+fileFormatVersion: 2
+guid: 62b78456069047e0949dd1d8c4b25edc
+timeCreated: 1708253304

Editor/assembly-info.cs

@@ -1,4 +1,9 @@
-using System.Runtime.CompilerServices;
+#region
+
+using System.Runtime.CompilerServices;
+
+#endregion
 
 [assembly: InternalsVisibleTo("net.fushizen.xdress")]
 [assembly: InternalsVisibleTo("net.fushizen.xdress.editor")]
+[assembly: InternalsVisibleTo("nadena.dev.modular-avatar.harmony-patches")]

Runtime/ModularAvatarScaleAdjuster.cs

@@ -1,268 +0,0 @@
-using System;
-using System.Collections.Generic;
-using System.Linq;
-#if UNITY_EDITOR
-using UnityEditor;
-#endif
-using UnityEngine;
-
-namespace nadena.dev.modular_avatar.core
-{
-    [Serializable]
-    internal struct ScalePatch
-    {
-        public SkinnedMeshRenderer smr;
-        public int boneIndex;
-
-        public ScalePatch(SkinnedMeshRenderer smr, int boneIndex)
-        {
-            this.smr = smr;
-            this.boneIndex = boneIndex;
-        }
-
-        public bool Equals(ScalePatch other)
-        {
-            return smr.Equals(other.smr) && boneIndex == other.boneIndex;
-        }
-
-        public override bool Equals(object obj)
-        {
-            return obj is ScalePatch other && Equals(other);
-        }
-
-        public override int GetHashCode()
-        {
-            unchecked
-            {
-                return (smr.GetHashCode() * 397) ^ boneIndex;
-            }
-        }
-    }
-
-    [ExecuteInEditMode]
-    [DisallowMultipleComponent]
-    [AddComponentMenu("Modular Avatar/MA Scale Adjuster")]
-    [HelpURL("https://modular-avatar.nadena.dev/docs/reference/scale-adjuster?lang=auto")]
-    public sealed class ModularAvatarScaleAdjuster : AvatarTagComponent
-    {
-        [SerializeField] private Vector3 m_Scale = Vector3.one;
-
-        public Vector3 Scale
-        {
-            get => m_Scale;
-            set
-            {
-                m_Scale = value;
-                Update();
-            }
-        }
-
-        [SerializeField] internal Transform scaleProxy;
-
-        [SerializeField] private List<ScalePatch> patches = new List<ScalePatch>();
-
-        private bool initialized = false;
-
-#if UNITY_EDITOR
-        private void Update()
-        {
-            if (this == null) return;
-
-            PatchRenderers();
-
-            scaleProxy.localScale = m_Scale;
-        }
-
-        void OnValidate()
-        {
-            initialized = false;
-            EditorApplication.delayCall += Update;
-        }
-
-        private void PatchRenderers()
-        {
-            if (initialized || this == null) return;
-
-            if (PrefabUtility.IsPartOfPrefabInstance(this))
-            {
-                // Ensure we're using the same ScaleProxy as the corresponding prefab asset.
-                var prefab = PrefabUtility.GetCorrespondingObjectFromSource(this);
-                if (this.scaleProxy == null || prefab.scaleProxy == null || prefab.scaleProxy !=
-                    PrefabUtility.GetCorrespondingObjectFromSource(this.scaleProxy))
-                {
-                    if (prefab.scaleProxy == null && scaleProxy != null)
-                    {
-                        // Push our ScaleProxy down into the prefab (this happens after applying the ScaleAdjuster
-                        // component to a prefab)
-                        var assetPath = AssetDatabase.GetAssetPath(prefab);
-                        PrefabUtility.ApplyAddedGameObject(scaleProxy.gameObject, assetPath,
-                            InteractionMode.AutomatedAction);
-                        prefab.scaleProxy = PrefabUtility.GetCorrespondingObjectFromSource(this.scaleProxy);
-                    }
-                    else
-                    {
-                        // Clear any duplicate scaleProxy we have
-
-                        if (scaleProxy != null) DestroyImmediate(scaleProxy.gameObject);
-                    }
-
-                    var so = new SerializedObject(this);
-                    var sp = so.FindProperty(nameof(scaleProxy));
-                    PrefabUtility.RevertPropertyOverride(sp, InteractionMode.AutomatedAction);
-                    so.ApplyModifiedPropertiesWithoutUndo();
-
-                    // Find the corresponding child
-                    foreach (Transform t in transform)
-                    {
-                        if (PrefabUtility.GetCorrespondingObjectFromSource(t) == prefab.scaleProxy)
-                        {
-                            scaleProxy = t;
-                            break;
-                        }
-                    }
-                }
-            }
-
-            if (scaleProxy == null && !PrefabUtility.IsPartOfPrefabAsset(this))
-            {
-                scaleProxy = new GameObject(gameObject.name + " (Scale Proxy)").transform;
-                scaleProxy.SetParent(transform, false);
-                scaleProxy.localPosition = Vector3.zero;
-                scaleProxy.localRotation = Quaternion.identity;
-                scaleProxy.localScale = m_Scale;
-                scaleProxy.gameObject.AddComponent<ScaleProxy>();
-                PrefabUtility.RecordPrefabInstancePropertyModifications(this);
-            }
-
-            if (scaleProxy != null)
-            {
-                scaleProxy.hideFlags = HideFlags.HideInHierarchy;
-
-                RewriteBoneReferences(transform, scaleProxy);
-            }
-
-            initialized = true;
-        }
-
-        private void RewriteBoneReferences(Transform oldBone, Transform newBone, Transform selfTransform = null)
-        {
-            if (selfTransform == null) selfTransform = transform;
-
-            var prefabNewBone = PrefabUtility.GetCorrespondingObjectFromSource(newBone);
-
-            var oldPatches = new HashSet<ScalePatch>(this.patches);
-            var newPatches = new HashSet<ScalePatch>();
-            var avatarRoot = RuntimeUtil.FindAvatarTransformInParents(selfTransform);
-
-            if (avatarRoot != null)
-            {
-                foreach (var smr in avatarRoot.GetComponentsInChildren<SkinnedMeshRenderer>(true))
-                {
-                    var serializedObject = new SerializedObject(smr);
-                    var bonesArray = serializedObject.FindProperty("m_Bones");
-                    int boneCount = bonesArray.arraySize;
-
-                    var parentSmr = PrefabUtility.GetCorrespondingObjectFromSource(smr);
-                    var parentBones = parentSmr != null ? parentSmr.bones : null;
-                    var propMods = PrefabUtility.GetPropertyModifications(smr);
-
-                    bool changed = false;
-
-                    for (int i = 0; i < boneCount; i++)
-                    {
-                        var boneProp = bonesArray.GetArrayElementAtIndex(i);
-                        var bone = boneProp.objectReferenceValue as Transform;
-                        if (bone == oldBone || bone == newBone ||
-                            (bone == null && oldPatches.Contains(new ScalePatch(smr, i))))
-                        {
-                            if (parentBones != null && parentBones[i] == prefabNewBone)
-                            {
-                                // Remove any prefab overrides for this bone entry
-                                changed = boneProp.objectReferenceValue != newBone;
-                                boneProp.objectReferenceValue = newBone;
-                                serializedObject.ApplyModifiedPropertiesWithoutUndo();
-                                PrefabUtility.RevertPropertyOverride(boneProp, InteractionMode.AutomatedAction);
-                            }
-                            else
-                            {
-                                boneProp.objectReferenceValue = newBone;
-                                changed = true;
-                            }
-
-                            newPatches.Add(new ScalePatch(smr, i));
-                        }
-                    }
-
-                    if (changed)
-                    {
-                        serializedObject.ApplyModifiedPropertiesWithoutUndo();
-
-                        ConfigurePrefab();
-                    }
-                }
-
-                if (this != null && newPatches != oldPatches)
-                {
-                    this.patches = newPatches.ToList();
-                    PrefabUtility.RecordPrefabInstancePropertyModifications(this);
-                }
-            }
-        }
-
-        private void ConfigurePrefab()
-        {
-            if (this == null || !PrefabUtility.IsPartOfPrefabInstance(this)) return;
-            var source = PrefabUtility.GetCorrespondingObjectFromSource(this);
-            var path = AssetDatabase.GetAssetPath(source);
-            var root = PrefabUtility.LoadPrefabContents(path);
-
-            foreach (var obj in root.GetComponentsInChildren<ModularAvatarScaleAdjuster>())
-            {
-                obj.PatchRenderers();
-            }
-
-            PrefabUtility.SaveAsPrefabAsset(root, path);
-            PrefabUtility.UnloadPrefabContents(root);
-
-            initialized = false;
-        }
-
-        protected override void OnDestroy()
-        {
-            base.OnDestroy();
-
-            UnpatchRenderers();
-        }
-
-        private void UnpatchRenderers()
-        {
-            var scaleProxy2 = this.scaleProxy;
-            var transform2 = this.transform;
-
-            EditorApplication.delayCall += () =>
-            {
-                if (scaleProxy2 == null) return;
-
-                if (transform2 != null)
-                {
-                    RewriteBoneReferences(scaleProxy2, transform2, transform2);
-                }
-
-                try
-                {
-                    DestroyImmediate(scaleProxy2.gameObject);
-                }
-                catch (InvalidOperationException e)
-                {
-                    // not supported in Unity 2019...
-                }
-            };
-        }
-#else
-        private void Update()
-        {
-            // placeholder to make builds work
-        }
-#endif
-    }
-}

Runtime/ScaleAdjuster.meta

@@ -0,0 +1,3 @@
+fileFormatVersion: 2
+guid: 96f10f3195df42bba58b9efb61948b9c
+timeCreated: 1708232523

Runtime/ScaleAdjuster/ModularAvatarScaleAdjuster.cs

@@ -0,0 +1,128 @@
+#region
+
+using UnityEngine;
+using UnityEngine.Serialization;
+#if UNITY_EDITOR
+using UnityEditor;
+#endif
+
+#endregion
+
+namespace nadena.dev.modular_avatar.core
+{
+    [ExecuteInEditMode]
+    [DisallowMultipleComponent]
+    [AddComponentMenu("Modular Avatar/MA Scale Adjuster")]
+    [HelpURL("https://modular-avatar.nadena.dev/docs/reference/scale-adjuster?lang=auto")]
+    public sealed class ModularAvatarScaleAdjuster : AvatarTagComponent
+    {
+        private const string ADJUSTER_OBJECT = "MA Scale Adjuster Proxy Renderer"; 
+        [SerializeField] private Vector3 m_Scale = Vector3.one;
+
+        public Vector3 Scale
+        {
+            get => m_Scale;
+            set
+            {
+                m_Scale = value;
+                Update();
+            }
+        }
+
+        [SerializeField] [FormerlySerializedAs("scaleProxy")]
+        internal Transform legacyScaleProxy;
+
+        internal Transform scaleProxy;
+
+        private bool initialized = false;
+
+#if UNITY_EDITOR
+        void OnValidate()
+        {
+            base.OnValidate();
+            initialized = false;
+        }
+        
+        private void Update()
+        {
+            if (scaleProxy == null || initialized == false)
+            {
+                InitializeProxy();
+            }
+
+            if (legacyScaleProxy != null && !PrefabUtility.IsPartOfPrefabAsset(legacyScaleProxy))
+            {
+                DestroyImmediate(legacyScaleProxy.gameObject);
+                legacyScaleProxy = null;
+            }
+            
+            scaleProxy.localScale = m_Scale;
+        }
+
+        private void InitializeProxy()
+        {
+            if (scaleProxy == null)
+            {
+                scaleProxy = new GameObject(gameObject.name + " (Scale Proxy)").transform;
+                scaleProxy.SetParent(transform, false);
+                scaleProxy.localPosition = Vector3.zero;
+                scaleProxy.localRotation = Quaternion.identity;
+                scaleProxy.localScale = m_Scale;
+                scaleProxy.gameObject.AddComponent<ScaleProxy>();
+                PrefabUtility.RecordPrefabInstancePropertyModifications(this);
+            }
+
+            ConfigureRenderers();
+
+            initialized = true;
+        }
+
+        private void OnDestroy()
+        {
+            if (scaleProxy != null)
+            {
+                DestroyImmediate(scaleProxy.gameObject);
+            }
+
+            ScaleAdjusterRenderer.InvalidateAll();
+            base.OnDestroy();
+        }
+
+
+        private void ConfigureRenderers()
+        {
+            var avatar = RuntimeUtil.FindAvatarInParents(transform);
+            if (avatar == null) return;
+            foreach (var smr in avatar.GetComponentsInChildren<SkinnedMeshRenderer>(true))
+            {
+                if (smr.GetComponent<ScaleAdjusterRenderer>() != null) continue;
+
+                var child = smr.transform.Find(ADJUSTER_OBJECT)?.GetComponent<ScaleAdjusterRenderer>();
+                if (child == null)
+                {
+                    var childObj = new GameObject(ADJUSTER_OBJECT);
+
+                    var childSmr = childObj.AddComponent<SkinnedMeshRenderer>();
+                    EditorUtility.CopySerialized(smr, childSmr);
+
+                    child = childObj.AddComponent<ScaleAdjusterRenderer>();
+                    child.transform.SetParent(smr.transform, false);
+                    child.transform.localPosition = Vector3.zero;
+                    child.transform.localRotation = Quaternion.identity;
+                    child.transform.localScale = Vector3.one;
+                }
+
+                child.BoneMappings[transform] = scaleProxy;
+                child.ClearBoneCache();
+            }
+        }
+#endif
+
+#if !UNITY_EDITOR
+        private void Update()
+        {
+            // placeholder to make builds work
+        }
+#endif
+    }
+}

Runtime/ScaleAdjuster/ScaleAdjusterRenderer.cs

@@ -0,0 +1,178 @@
+#region
+
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using UnityEngine;
+using VRC.SDKBase;
+
+#endregion
+
+namespace nadena.dev.modular_avatar.core
+{
+    [ExecuteInEditMode]
+    //[AddComponentMenu("")]
+    [RequireComponent(typeof(SkinnedMeshRenderer))]
+    internal class ScaleAdjusterRenderer : MonoBehaviour, IEditorOnly
+    {
+        private static event Action OnPreInspector;
+        private static int RecreateHierarchyIndexCount = 0;
+
+        #if UNITY_EDITOR
+        [UnityEditor.InitializeOnLoadMethod]
+        static void Setup()
+        {
+            UnityEditor.EditorApplication.hierarchyChanged += InvalidateAll;
+        }
+        #endif
+
+        internal static void InvalidateAll()
+        {
+            RecreateHierarchyIndexCount++;
+        }
+
+        private SkinnedMeshRenderer myRenderer;
+        private SkinnedMeshRenderer parentRenderer;
+
+        private bool wasActive = false;
+        private bool redoBoneMappings = true;
+        private int lastRecreateHierarchyIndex = -1;
+
+        internal Dictionary<Transform, Transform> BoneMappings = new Dictionary<Transform, Transform>();
+
+        #if UNITY_EDITOR
+        private void OnValidate()
+        {
+            if (UnityEditor.PrefabUtility.IsPartOfPrefabAsset(this)) return;
+            redoBoneMappings = true;
+
+            UnityEditor.EditorApplication.delayCall += () =>
+            {
+                if (this == null) return;
+
+#if MODULAR_AVATAR_DEBUG_HIDDEN
+                gameObject.hideFlags = HideFlags.None;
+#else
+                gameObject.hideFlags = HideFlags.HideInHierarchy | HideFlags.DontSaveInBuild;
+#endif
+                if (BoneMappings == null)
+                {
+                    BoneMappings = new Dictionary<Transform, Transform>();
+                }
+            };
+        }
+        #endif
+        
+        private Transform MapBone(Transform bone)
+        {
+            if (bone == null) return null;
+            if (BoneMappings.TryGetValue(bone, out var newBone) && newBone != null) return newBone;
+            return bone;
+        }
+
+        private void OnDestroy()
+        {
+            ClearOverrides();
+        }
+
+        private void Update()
+        {
+            if (myRenderer == null)
+            {
+                myRenderer = GetComponent<SkinnedMeshRenderer>();
+            }
+
+            if (parentRenderer == null)
+            {
+                parentRenderer = transform.parent.GetComponent<SkinnedMeshRenderer>();
+            }
+
+            myRenderer.sharedMaterials = parentRenderer.sharedMaterials;
+            myRenderer.sharedMesh = parentRenderer.sharedMesh;
+            myRenderer.localBounds = parentRenderer.localBounds;
+            if (redoBoneMappings || lastRecreateHierarchyIndex != RecreateHierarchyIndexCount)
+            {
+                var deadBones = BoneMappings.Keys.Where(k => BoneMappings[k] == null)
+                    .ToList();
+                deadBones.ForEach(k => { BoneMappings.Remove(k); });
+
+                if (BoneMappings.Count == 0)
+                {
+                    DestroyImmediate(gameObject);
+                    return;
+                }
+
+                myRenderer.rootBone = MapBone(parentRenderer.rootBone);
+                myRenderer.bones = parentRenderer.bones.Select(MapBone).ToArray();
+                redoBoneMappings = false;
+                lastRecreateHierarchyIndex = RecreateHierarchyIndexCount;
+            }
+
+            myRenderer.quality = parentRenderer.quality;
+            myRenderer.shadowCastingMode = parentRenderer.shadowCastingMode;
+            myRenderer.receiveShadows = parentRenderer.receiveShadows;
+            myRenderer.lightProbeUsage = parentRenderer.lightProbeUsage;
+            myRenderer.reflectionProbeUsage = parentRenderer.reflectionProbeUsage;
+            myRenderer.probeAnchor = parentRenderer.probeAnchor;
+            myRenderer.motionVectorGenerationMode = parentRenderer.motionVectorGenerationMode;
+            myRenderer.allowOcclusionWhenDynamic = parentRenderer.allowOcclusionWhenDynamic;
+
+            var blendShapeCount = myRenderer.sharedMesh.blendShapeCount;
+
+            for (int i = 0; i < blendShapeCount; i++)
+            {
+                myRenderer.SetBlendShapeWeight(i, parentRenderer.GetBlendShapeWeight(i));
+            }
+
+            ClearOverrides();
+
+            myRenderer.enabled = parentRenderer.enabled;
+        }
+
+        public void OnWillRenderObject()
+        {
+            if (myRenderer == null || parentRenderer == null)
+            {
+                return;
+            }
+
+            ClearOverrides();
+
+            if (!parentRenderer.enabled || !parentRenderer.gameObject.activeInHierarchy)
+            {
+                return;
+            }
+
+            parentRenderer.enabled = false;
+            wasActive = true;
+            OnPreInspector += ClearOverrides;
+        }
+
+        private void OnPostRender()
+        {
+            ClearOverrides();
+        }
+
+        private void ClearOverrides()
+        {
+            if (this == null) return;
+
+            if (wasActive && parentRenderer != null)
+            {
+                parentRenderer.enabled = true;
+                wasActive = false;
+            }
+        }
+
+        public void ClearBoneCache()
+        {
+            redoBoneMappings = true;
+        }
+
+        internal static void ClearAllOverrides()
+        {
+            OnPreInspector?.Invoke();
+            OnPreInspector = null;
+        }
+    }
+}

Runtime/ScaleAdjuster/ScaleAdjusterRenderer.cs.meta

@@ -0,0 +1,3 @@
+fileFormatVersion: 2
+guid: c8bc16baa6c345eea5edf47232ee4069
+timeCreated: 1708232586

Runtime/ScaleAdjuster/ScaleProxy.cs

@@ -1,7 +1,12 @@
-#if UNITY_EDITOR
+
+#region
+
+using UnityEngine;
+#if UNITY_EDITOR
 using UnityEditor;
 #endif
-using UnityEngine;
+
+#endregion
 
 namespace nadena.dev.modular_avatar.core
 {
@@ -11,9 +16,16 @@ namespace nadena.dev.modular_avatar.core
 #if UNITY_EDITOR
         void OnValidate()
         {
+            base.OnDestroy();
             EditorApplication.delayCall += DeferredValidate;
         }
 
+        void OnDestroy()
+        {
+            ScaleAdjusterRenderer.InvalidateAll();
+            base.OnDestroy();
+        }
+        
         private void DeferredValidate()
         {
             if (this == null) return;
@@ -23,8 +35,16 @@ namespace nadena.dev.modular_avatar.core
                 gameObject.AddComponent<ModularAvatarPBBlocker>();
             }
 
+            var avatar = ndmf.runtime.RuntimeUtil.FindAvatarInParents(transform);
+            ClearOverrides(avatar);
+
             gameObject.hideFlags = HideFlags.HideInHierarchy;
 
+#if MODULAR_AVATAR_DEBUG_HIDDEN
+            gameObject.hideFlags = HideFlags.None;
+#endif
+            hideFlags = HideFlags.None;
+            
             var parentObject = transform.parent;
             var parentScaleAdjuster =
                 parentObject != null ? parentObject.GetComponent<ModularAvatarScaleAdjuster>() : null;
@@ -60,8 +80,19 @@ namespace nadena.dev.modular_avatar.core
                 while (root.parent != null) root = root.parent;
             }
 
+            ClearOverrides(root);
+
+            DestroyImmediate(gameObject);
+        }
+
+        private void ClearOverrides(Transform root)
+        {
+            // This clears bone overrides that date back to the 1.9.0-rc.2 implementation, to ease rc.2 -> rc.3
+            // migrations. It'll be removed in 1.10.
             foreach (var smr in root.GetComponentsInChildren<SkinnedMeshRenderer>(true))
             {
+                if (smr.GetComponent<ScaleAdjusterRenderer>()) continue;
+
                 var bones = smr.bones;
                 bool changed = false;
 
@@ -79,8 +110,6 @@ namespace nadena.dev.modular_avatar.core
                     smr.bones = bones;
                 }
             }
-
-            DestroyImmediate(gameObject);
         }
 #endif
     }

Runtime/TestBehavior.cs.meta

@@ -0,0 +1,3 @@
+fileFormatVersion: 2
+guid: f2c964d1229a4ce698db85bec9043608
+timeCreated: 1708232304

Runtime/assembly-info.cs

@@ -1,6 +1,11 @@
+#region
+
 using System.Runtime.CompilerServices;
 
+#endregion
+
 [assembly: InternalsVisibleTo("nadena.dev.modular-avatar.core.editor")]
 [assembly: InternalsVisibleTo("net.fushizen.xdress")]
 [assembly: InternalsVisibleTo("net.fushizen.xdress.editor")]
 [assembly: InternalsVisibleTo("Tests")]
+[assembly: InternalsVisibleTo("nadena.dev.modular-avatar.harmony-patches")]

UnitTests~/ComponentSettingsTest.cs

@@ -40,6 +40,7 @@ namespace modular_avatar_tests
             if (type == typeof(AvatarActivator)) return;
             if (type == typeof(TestComponent)) return;
             if (type == typeof(ScaleProxy)) return;
+            if (type == typeof(ScaleAdjusterRenderer)) return;
 
             // get icon
             var component = (MonoBehaviour) _gameObject.AddComponent(type);
@@ -65,6 +66,7 @@ namespace modular_avatar_tests
             if (type == typeof(AvatarActivator)) return;
             if (type == typeof(TestComponent)) return;
             if (type == typeof(ScaleProxy)) return;
+            if (type == typeof(ScaleAdjusterRenderer)) return;
 
             // get icon
             var helpUrl = type.GetCustomAttribute<HelpURLAttribute>();