fix: null reference in Merge Armature after physbones are merged (#533)

Editor/MergeArmatureHook.cs

@@ -384,7 +384,7 @@ namespace nadena.dev.modular_avatar.core.editor
 
         private bool IsAffectedByPhysBone(Transform target)
         {
-            return physBones.Any(x => target.IsChildOf(x.GetRootTransform()) &&
+            return physBones.Any(x => x != null && target.IsChildOf(x.GetRootTransform()) &&
                 x.ignoreTransforms.All(y => y == null || !target.IsChildOf(y)));
         }
 

UnitTests~/EasySetupOutfit/ArmatureConfusionTest.cs

@@ -24,8 +24,8 @@ public class ArmatureConfusionTest : TestBase
         ESOErrorWindow.Suppress = true;
 
         // Arrange for a confused armature
-        var outer = CreatePrefab("shapell.fbx");
+        var outer = CreateCommonPrefab("shapell.fbx");
-        var inner = CreatePrefab("shapell.fbx");
+        var inner = CreateCommonPrefab("shapell.fbx");
 
         var outerAnimator = outer.GetComponent<Animator>();
 #if MA_VRCSDK3_AVATARS

UnitTests~/EasySetupOutfit/PreferFirstHipsMatch.cs

@@ -10,7 +10,7 @@ public class PreferFirstHipsMatch : TestBase
     [Test]
     public void SetupHeuristicPrefersFirstHipsMatch()
     {
-        var root = CreatePrefab("shapell.fbx");
+        var root = CreateCommonPrefab("shapell.fbx");
         root.AddComponent<VRCAvatarDescriptor>();
         var root_hips = root.GetComponent<Animator>().GetBoneTransform(HumanBodyBones.Hips).gameObject;
         var root_armature = root_hips.transform.parent.gameObject;

UnitTests~/MergeArmatureTests/MergeArmatureTests.cs

@@ -1,10 +1,17 @@
-using modular_avatar_tests;
+using System.Linq;
+using modular_avatar_tests;
 using nadena.dev.modular_avatar.core.editor;
 using NUnit.Framework;
+using UnityEditor;
 using UnityEngine;
+using VRC.SDK3.Avatars.Components;
+using VRC.SDK3.Dynamics.PhysBone.Components;
+using ModularAvatarMergeArmature = nadena.dev.modular_avatar.core.ModularAvatarMergeArmature;
 
 public class MergeArmatureTests : TestBase
 {
+    private const string SHAPELL_FBX_GUID = "1418fcab2d94f9d4982cd714b598900f";
+    
     [Test]
     public void DontStripObjectsWithComponents()
     {
@@ -19,4 +26,60 @@ public class MergeArmatureTests : TestBase
 
         Assert.NotNull(targetHips.GetChild(1).GetComponent<BoxCollider>());
     }
+
+    [Test]
+    public void PhysBonesNRETest()
+    {
+        var root = LoadShapell();
+        var avdesc = root.AddComponent<VRCAvatarDescriptor>();
+        avdesc.baseAnimationLayers = new VRCAvatarDescriptor.CustomAnimLayer[0];
+        avdesc.specialAnimationLayers = new VRCAvatarDescriptor.CustomAnimLayer[0];
+
+        var outfit1 = LoadShapell();
+        outfit1.transform.SetParent(root.transform, false);
+        
+        var outfit2 = LoadShapell();
+        outfit2.transform.SetParent(root.transform, false);
+        
+        var outfit1_hips = outfit1.transform.Find("Armature/Hips");
+        var outfit2_hips = outfit2.transform.Find("Armature/Hips");
+        var root_hips = root.transform.Find("Armature/Hips");
+        
+        root_hips.gameObject.AddComponent<VRCPhysBone>();
+        outfit1_hips.gameObject.AddComponent<VRCPhysBone>();
+        outfit2_hips.gameObject.AddComponent<VRCPhysBone>();
+        
+        var root_smr = root.transform.Find("Body").gameObject.GetComponent<SkinnedMeshRenderer>();
+        var outfit1_smr = outfit1.transform.Find("Body").gameObject.GetComponent<SkinnedMeshRenderer>();
+        var outfit2_smr = outfit2.transform.Find("Body").gameObject.GetComponent<SkinnedMeshRenderer>();
+        
+        outfit1.transform.Find("Armature").gameObject.AddComponent<ModularAvatarMergeArmature>().mergeTarget.Set(
+            root.transform.Find("Armature").gameObject
+        );
+        
+        outfit2.transform.Find("Armature").gameObject.AddComponent<ModularAvatarMergeArmature>().mergeTarget.Set(
+            root.transform.Find("Armature").gameObject
+        );
+
+        AvatarProcessor.ProcessAvatar(root);
+
+        foreach (var (root_bone, outfit_bone) in Enumerable.Zip(root_smr.bones, outfit1_smr.bones, (x, y) => (x, y)))
+        {
+            Assert.AreSame(root_bone, outfit_bone);
+        }
+        
+        foreach (var (root_bone, outfit_bone) in Enumerable.Zip(root_smr.bones, outfit2_smr.bones, (x, y) => (x, y)))
+        {
+            Assert.AreSame(root_bone, outfit_bone);
+        }
+    }
+
+    private static GameObject LoadShapell()
+    {
+        return GameObject.Instantiate(
+            AssetDatabase.LoadAssetAtPath<GameObject>(
+                AssetDatabase.GUIDToAssetPath(SHAPELL_FBX_GUID)
+            )
+        );
+    }
 }

UnitTests~/TestBase.cs

@@ -86,6 +86,15 @@ namespace modular_avatar_tests
             return go;
         }
 
+        
+        protected GameObject CreateCommonPrefab(string relPath)
+        {
+            var prefab = AssetDatabase.LoadAssetAtPath<GameObject>("Packages/nadena.dev.modular-avatar/UnitTests/_CommonAssets/" + relPath);
+
+            var go = Object.Instantiate(prefab);
+            objects.Add(go);
+            return go;
+        }
 
         protected T LoadAsset<T>(string relPath) where T : UnityEngine.Object
         {

UnitTests~/_CommonAssets.meta

@@ -0,0 +1,8 @@
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+folderAsset: yes
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@@ -0,0 +1,426 @@
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