fix: transform lookthrough logic was broken and could result in deleted curves (#1558)

Closes: #1550

CHANGELOG-PRERELEASE-jp.md

@@ -10,6 +10,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ### Added
 
 ### Fixed
+- [#1558] Merge AnimatorでベースアバターのArmature内のTransformをアニメーションさせると壊れる問題を修正
 
 ### Changed
 

CHANGELOG-PRERELEASE.md

@@ -10,6 +10,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ### Added
 
 ### Fixed
+- [#1558] Fixed an issue where Merge Animators animating transforms in the base avatar's armature would break.
 
 ### Changed
 

CHANGELOG-jp.md

@@ -15,6 +15,7 @@ Modular Avatarの主な変更点をこのファイルで記録しています。
   コンポーネントとマージされた場合、指定されたオブジェクトが存在しないことを検出し、参照を絶対パスとして扱うように修正
   - 対象のパスにオブジェクトがある場合は、相対パスとして扱われます。安定性向上のためMerge Animatorコンポーネントと同じ
   　指定方法を使用することをお勧めします。
+- [#1558] Merge AnimatorでベースアバターのArmature内のTransformをアニメーションさせると壊れる問題を修正
 
 ### Changed
 

CHANGELOG.md

@@ -19,6 +19,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
   - Note that if there is an object in the target path, then it will be treated as a relative path. Using
     addressing for Play Audio behaviors consistent with Merge Animator settings is therefore recommended as it will be
     more robust.
+- [#1558] Fixed an issue where Merge Animators animating transforms in the base avatar's armature would break.
 
 ### Changed
 

Editor/MergeArmatureHook.cs

@@ -164,12 +164,15 @@ namespace nadena.dev.modular_avatar.core.editor
                     {
                         var newPath = GetReplacementPath(binding.path);
 
+                        if (newPath != binding.path)
+                        {
                             var newBinding = EditorCurveBinding.FloatCurve(newPath, binding.type, binding.propertyName);
                             clip.SetFloatCurve(newBinding, clip.GetFloatCurve(binding));
                             clip.SetFloatCurve(binding, null);
                         }
                     }
                 }
+            }
             
             string GetReplacementPath(string bindingPath)
             {

Editor/MeshRetargeter.cs

@@ -22,13 +22,14 @@
  * SOFTWARE.
  */
 
+using System;
 using System.Collections.Generic;
 using System.Linq;
 using JetBrains.Annotations;
-using nadena.dev.modular_avatar.animation;
 using nadena.dev.modular_avatar.editor.ErrorReporting;
 using nadena.dev.ndmf.animator;
 using UnityEngine;
+using Object = UnityEngine.Object;
 
 namespace nadena.dev.modular_avatar.core.editor
 {
@@ -158,7 +159,7 @@ namespace nadena.dev.modular_avatar.core.editor
 
                     // Remap any animation clips that reference this bone into its parent
                     _pathRemapper.ReplaceObject(sourceBone.gameObject, sourceBone.transform.parent.gameObject);
-                    UnityEngine.Object.DestroyImmediate(sourceBone.gameObject);
+                    Object.DestroyImmediate(sourceBone.gameObject);
                 }
             }
         }
@@ -185,7 +186,7 @@ namespace nadena.dev.modular_avatar.core.editor
         public Mesh Retarget()
         {
             var avatarTransform = RuntimeUtil.FindAvatarTransformInParents(renderer.transform);
-            if (avatarTransform == null) throw new System.Exception("Could not find avatar in parents of " + renderer.name);
+            if (avatarTransform == null) throw new Exception("Could not find avatar in parents of " + renderer.name);
 
             var avPos = avatarTransform.position;
             var avRot = avatarTransform.rotation;

UnitTests~/MergeAnimatorTests/MergeSingleTests.cs

@@ -1,5 +1,8 @@
 #if MA_VRCSDK3_AVATARS
 
+using System;
+using System.Collections.Generic;
+using System.Linq;
 using modular_avatar_tests;
 using nadena.dev.modular_avatar.animation;
 using nadena.dev.modular_avatar.core;
@@ -7,9 +10,11 @@ using nadena.dev.modular_avatar.core.editor;
 using nadena.dev.ndmf;
 using nadena.dev.ndmf.animator;
 using NUnit.Framework;
+using UnityEditor;
 using UnityEditor.Animations;
 using UnityEngine;
 using VRC.SDK3.Avatars.Components;
+using AvatarProcessor = nadena.dev.ndmf.AvatarProcessor;
 using BuildContext = nadena.dev.ndmf.BuildContext;
 
 namespace UnitTests.MergeAnimatorTests

UnitTests~/MergeArmatureTests/MergeArmatureTests.cs

@@ -1,4 +1,5 @@
-using System.Linq;
+using System.Collections.Generic;
+using System.Linq;
 using modular_avatar_tests;
 using nadena.dev.modular_avatar.core.editor;
 using NUnit.Framework;
@@ -7,6 +8,8 @@ using UnityEngine;
 using ModularAvatarMergeArmature = nadena.dev.modular_avatar.core.ModularAvatarMergeArmature;
 
 #if MA_VRCSDK3_AVATARS
+using System;
+using nadena.dev.modular_avatar.core;
 using VRC.SDK3.Avatars.Components;
 using VRC.SDK3.Dynamics.PhysBone.Components;
 #endif
@@ -100,6 +103,36 @@ public class MergeArmatureTests : TestBase
         }
     }
 
+    [Test]
+    public void RetainsTransformLookthroughTest()
+    {
+        var root = CreatePrefab("TransformLookthrough/RetainsTransformLookthroughCurves.prefab");
+
+        AvatarProcessor.ProcessAvatar(root);
+
+        var testLayer = findFxLayer(root, "test");
+        var motion = (AnimationClip)testLayer.stateMachine.defaultState.motion;
+
+        var subArmature = root.transform.GetChild(0).GetChild(0).GetChild(0);
+        var armaturePath = RuntimeUtil.AvatarRootPath(subArmature.gameObject);
+        var hipsPath = "Armature/Hips";
+            
+        var curves = AnimationUtility.GetCurveBindings(motion)
+            .Select(ecb => (ecb.path,  ecb.type, ecb.propertyName))
+            .ToHashSet();
+        var expectedCurves = new HashSet<(string, Type, string)>()
+        {
+            (armaturePath, typeof(GameObject), "m_IsActive"),
+            (hipsPath, typeof(Transform), "m_LocalScale.x"),
+            (hipsPath, typeof(Transform), "m_LocalScale.y"),
+            (hipsPath, typeof(Transform), "m_LocalScale.z"),
+            // It's not clear if we should be animating the root Armature object here, but this matches the pre-1.12
+            // behavior and is therefore probably best from a compatibility perspective
+            ("Armature", typeof(GameObject), "m_IsActive")
+        };
+            
+        Assert.That(expectedCurves, Is.EquivalentTo(curves));
+    }
 #endif
 
     private static GameObject LoadShapell()

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