fix: shape changer doesn't set the correct initial state for blendshapes it controls (#904)

Closes: #872

Editor/PluginDefinition/PluginDefinition.cs

@@ -48,6 +48,7 @@ namespace nadena.dev.modular_avatar.core.editor.plugin
                 seq.Run(MeshSettingsPluginPass.Instance);
                 seq.Run(ScaleAdjusterPass.Instance).PreviewingWith(new ScaleAdjusterPreview());
 #if MA_VRCSDK3_AVATARS
+                seq.Run(ShapeChangerPrePass.Instance);
                 seq.Run(RenameParametersPluginPass.Instance);
                 seq.Run(MergeBlendTreePass.Instance);
                 seq.Run(MergeAnimatorPluginPass.Instance);

Editor/ShapeChanger/RemoveBlendShapeFromMesh.cs

@@ -144,6 +144,8 @@ namespace nadena.dev.modular_avatar.core.editor
             List<BoneWeight1> boneWeights = new(origBoneWeights.Length);
             List<byte> bonesPerVertex = new(origBonesPerVertex.Length);
 
+            if (bonesPerVertex.Count == 0) return; // no bones in this mesh
+
             int ptr = 0;
             for (int i = 0; i < toRetain.Length; i++)
             {

Editor/ShapeChanger/ShapeChangerPass.cs

@@ -5,6 +5,7 @@ using System.Collections.Generic;
 using System.Collections.Immutable;
 using System.Linq;
 using nadena.dev.modular_avatar.animation;
+using nadena.dev.ndmf;
 using UnityEditor;
 using UnityEditor.Animations;
 using UnityEngine;
@@ -14,6 +15,51 @@ using VRC.SDK3.Avatars.Components;
 
 namespace nadena.dev.modular_avatar.core.editor
 {
+    /// <summary>
+    ///     Reserve an animator layer for Shape Changer's use. We do this here so that we can take advantage of MergeAnimator's
+    ///     layer reference correction logic; this can go away once we have a more unified animation services API.
+    /// </summary>
+    internal class ShapeChangerPrePass : Pass<ShapeChangerPrePass>
+    {
+        internal const string TAG_PATH = "__MA/ShapeChanger/PrepassPlaceholder";
+
+        protected override void Execute(ndmf.BuildContext context)
+        {
+            if (context.AvatarRootObject.GetComponentInChildren<ModularAvatarShapeChanger>() != null)
+            {
+                var clip = new AnimationClip();
+                clip.name = "MA Shape Changer Defaults";
+
+                var curve = new AnimationCurve();
+                curve.AddKey(0, 0);
+                clip.SetCurve(TAG_PATH, typeof(Transform), "localPosition.x", curve);
+
+                // Merge using a null blend tree. This also ensures that we initialize the Merge Blend Tree system.
+                var bt = new BlendTree();
+                bt.name = "MA Shape Changer Defaults";
+                bt.blendType = BlendTreeType.Direct;
+                bt.children = new[]
+                {
+                    new ChildMotion
+                    {
+                        motion = clip,
+                        timeScale = 1,
+                        cycleOffset = 0,
+                        directBlendParameter = MergeBlendTreePass.ALWAYS_ONE
+                    }
+                };
+                bt.useAutomaticThresholds = false;
+
+                // This is a hack and a half - put in a dummy path so we can find the cloned clip later on...
+                var obj = new GameObject("MA SC Defaults");
+                obj.transform.SetParent(context.AvatarRootTransform);
+                var mambt = obj.AddComponent<ModularAvatarMergeBlendTree>();
+                mambt.BlendTree = bt;
+                mambt.PathMode = MergeAnimatorPathMode.Absolute;
+            }
+        }
+    }
+    
     internal class ShapeChangerPass
     {
         struct ShapeKey
@@ -48,6 +94,7 @@ namespace nadena.dev.modular_avatar.core.editor
             public string DeleteParam { get; set; }
 
             public bool alwaysDeleted;
+            public float currentState;
 
             // Objects which trigger deletion of this shape key. 
             public List<GameObject> deletionObjects = new List<GameObject>();
@@ -56,6 +103,9 @@ namespace nadena.dev.modular_avatar.core.editor
             public ShapeKeyInfo(ShapeKey key)
             {
                 ShapeKey = key;
+                currentState = (EditorUtility.InstanceIDToObject(key.RendererInstanceId) as SkinnedMeshRenderer)
+                               ?.GetBlendShapeWeight(key.ShapeIndex)
+                               ?? 0;
             }
         }
         
@@ -132,6 +182,8 @@ namespace nadena.dev.modular_avatar.core.editor
         private readonly ndmf.BuildContext context;
         private Dictionary<string, float> initialValues = new();
 
+        private AnimationClip _initialStateClip;
+        
         public ShapeChangerPass(ndmf.BuildContext context)
         {
             this.context = context;
@@ -141,6 +193,8 @@ namespace nadena.dev.modular_avatar.core.editor
         {
             Dictionary<ShapeKey, ShapeKeyInfo> shapes = FindShapes(context);
 
+            ProcessInitialStates(shapes);
+            
             foreach (var groups in shapes.Values)
             {
                 ProcessShapeKey(groups);
@@ -149,6 +203,36 @@ namespace nadena.dev.modular_avatar.core.editor
             ProcessMeshDeletion(shapes);
         }
 
+        private void ProcessInitialStates(Dictionary<ShapeKey, ShapeKeyInfo> shapes)
+        {
+            var clips = context.Extension<AnimationServicesContext>().AnimationDatabase;
+            var initialStateHolder = clips.ClipsForPath(ShapeChangerPrePass.TAG_PATH).FirstOrDefault();
+            if (initialStateHolder == null) return;
+
+            _initialStateClip = new AnimationClip();
+            _initialStateClip.name = "MA Shape Changer Defaults";
+            initialStateHolder.CurrentClip = _initialStateClip;
+
+            foreach (var (key, info) in shapes)
+            {
+                if (info.alwaysDeleted) continue;
+
+                var curve = new AnimationCurve();
+                curve.AddKey(0, info.currentState);
+                curve.AddKey(1, info.currentState);
+
+                var renderer = (SkinnedMeshRenderer)EditorUtility.InstanceIDToObject(key.RendererInstanceId);
+
+                var binding = EditorCurveBinding.FloatCurve(
+                    RuntimeUtil.RelativePath(context.AvatarRootObject, renderer.gameObject),
+                    typeof(SkinnedMeshRenderer),
+                    $"blendShape.{key.ShapeKeyName}"
+                );
+
+                AnimationUtility.SetEditorCurve(_initialStateClip, binding, curve);
+            }
+        }
+
         #region Mesh processing
 
         private void ProcessMeshDeletion(Dictionary<ShapeKey, ShapeKeyInfo> shapes)
@@ -565,9 +649,12 @@ namespace nadena.dev.modular_avatar.core.editor
                     }
 
                     var action = new ActionGroupKey(asc, key, changer.gameObject, shape);
+                    var isCurrentlyActive = changer.gameObject.activeInHierarchy;
 
                     if (action.IsDelete)
                     {
+                        if (isCurrentlyActive) info.currentState = 100;
+
                         if (action.ControllingObject == null)
                         {
                             // always active?
@@ -581,6 +668,8 @@ namespace nadena.dev.modular_avatar.core.editor
                         continue;
                     }
 
+                    if (changer.gameObject.activeInHierarchy) info.currentState = action.Value;
+
                     // TODO: lift controlling object resolution out of loop?
                     if (action.ControllingObject == null)
                     {

UnitTests~/ShapeChanger.meta

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UnitTests~/ShapeChanger/InitialStates.meta

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UnitTests~/ShapeChanger/InitialStates/SCDefaultAnimation.controller

@@ -0,0 +1,43 @@
+%YAML 1.1
+%TAG !u! tag:unity3d.com,2011:
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+  serializedVersion: 5
+  m_AnimatorParameters: []
+  m_AnimatorLayers:
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+    m_Name: Base Layer
+    m_StateMachine: {fileID: 1915927467537037891}
+    m_Mask: {fileID: 0}
+    m_Motions: []
+    m_Behaviours: []
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+    m_IKPass: 0
+    m_SyncedLayerAffectsTiming: 0
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+AnimatorStateMachine:
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+  m_ChildStates: []
+  m_ChildStateMachines: []
+  m_AnyStateTransitions: []
+  m_EntryTransitions: []
+  m_StateMachineTransitions: {}
+  m_StateMachineBehaviours: []
+  m_AnyStatePosition: {x: 50, y: 20, z: 0}
+  m_EntryPosition: {x: 50, y: 120, z: 0}
+  m_ExitPosition: {x: 800, y: 120, z: 0}
+  m_ParentStateMachinePosition: {x: 800, y: 20, z: 0}
+  m_DefaultState: {fileID: 0}

UnitTests~/ShapeChanger/InitialStates/SCDefaultAnimation.controller.meta

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UnitTests~/ShapeChanger/InitialStates/SCDefaultAnimation.cs

@@ -0,0 +1,62 @@
+using modular_avatar_tests;
+using nadena.dev.modular_avatar.animation;
+using nadena.dev.modular_avatar.core.editor;
+using NUnit.Framework;
+using UnityEditor;
+using UnityEditor.Animations;
+using UnityEngine;
+
+namespace ShapeChangerTests
+{
+    public class SCDefaultAnimation : TestBase
+    {
+        [Test]
+        public void SetsCorrectInitialStatesAndAnimations()
+        {
+            var root = CreatePrefab("SCDefaultAnimation.prefab");
+            AvatarProcessor.ProcessAvatar(root);
+
+            var fx = (AnimatorController) FindFxController(root).animatorController;
+            var baseLayer = fx.layers[0];
+            
+            var bt = baseLayer.stateMachine.states[0].state.motion as BlendTree;
+            Assert.NotNull(bt);
+            var subBt = bt.children[0].motion as BlendTree;
+            Assert.NotNull(subBt);
+            var clip = subBt.children[0].motion as AnimationClip;
+            Assert.NotNull(clip);
+
+            var bindings = AnimationUtility.GetCurveBindings(clip);
+            var curve = AnimationUtility.GetEditorCurve(clip, EditorCurveBinding.FloatCurve(
+                "test mesh",
+                typeof(SkinnedMeshRenderer),
+                "blendShape.key1"
+            ));
+            Assert.AreEqual(10.0f, curve.keys[0].value, 0.1f);
+            Assert.AreEqual(10.0f, curve.keys[1].value, 0.1f);
+            
+            curve = AnimationUtility.GetEditorCurve(clip, EditorCurveBinding.FloatCurve(
+                "test mesh",
+                typeof(SkinnedMeshRenderer),
+                "blendShape.key2"
+            ));
+            // Always-on delete, no curve should be generated
+            Assert.IsNull(curve);
+            
+            curve = AnimationUtility.GetEditorCurve(clip, EditorCurveBinding.FloatCurve(
+                "test mesh",
+                typeof(SkinnedMeshRenderer),
+                "blendShape.key3"
+            ));
+            Assert.AreEqual(100.0f, curve.keys[0].value, 0.1f);
+            Assert.AreEqual(100.0f, curve.keys[1].value, 0.1f);
+            
+            // Check actual blendshape states
+            var smr = root.transform.Find("test mesh").GetComponent<SkinnedMeshRenderer>();
+            var sharedMesh = smr.sharedMesh;
+            Assert.AreEqual(10.0f, smr.GetBlendShapeWeight(sharedMesh.GetBlendShapeIndex("key1")), 0.1f);
+            Assert.AreEqual(0.0f, smr.GetBlendShapeWeight(sharedMesh.GetBlendShapeIndex("key2")), 0.1f);
+            Assert.AreEqual(100.0f, smr.GetBlendShapeWeight(sharedMesh.GetBlendShapeIndex("key3")), 0.1f);
+        }
+    }
+}

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