feat: VRM0 / VRM1 support (UniVRM)

[kaikoga]

Discussed in #522

Support VRM0 / VRM1 avatars in AAO components.

Required Tasks

• Add Version Define AAO_VRM1 against "com.vrmc.vrm" and/or AAO_UNIVRMAAO_VRM0 against "com.vrmc.univrm"
• Register VRM0 / VRM1 components to ComponentInfo
• Fix Trace And Optimize
• Fix Freeze BlendShape (not AutoFreezeBlendShape)
• Fix Merge Skinned Mesh

Affected VRM0 / VRM1 components list

Broken by AAO

• BlendShapeClips(VRM0) / VRM10Expression(VRM1)
  • Morph targets in SkinnedMeshRenderers are referenced by index
  • Material are referenced by material name (I won't support this, cannot survive Merge ToonLit Material anyway)
• VRMFirstPerson(VRM0) / VRM10ObjectFirstPerson(VRM1)
  • Contains references(VRM0) or relative paths(wtf VRM1) to SkinnedMeshRenderers
  • Should merge entries

Modified but not broken by AAO

• VRMSpringBone(VRM0) / Vrm10InstanceSpringBone(VRM1)
  • Should merge VRM1Instance references (VRM1)
• VRMSpringBoneColliderGroup(VRM0) / VRM10SpringBoneColliderGroup(VRM1)
  • Should merge VRM1Instance references (VRM1)
• IVrm10Constraint(VRM1)
  • Pray if default object mapper does well

Unaffected by AAO

• VRMLookAtHead(VRM0) / VRM10ObjectLookAt(VRM1)
  • Driven through specific Humanoid bone if LookAtType is Bone (not serialized)
  • Driven through BlendShapeProxy / Expression name if LookAtType is BlendShape / Expression (not serialized)

AAO component list

Breaks Typical VRM Setup (update required)

• Trace And Optimize
  • Breaks everything
• Merge Skinned Mesh
  • Skinned meshes in BlendShapeClips(VRM0) / Expressions(VRM1) are referenced by path, need to update refs
• Freeze BlendShape
  • BlendShapes in BlendShapeClipsVRM0) / Expressions(VRM1) are referenced by index, need to update names

Possible Invalid Setup (wontfix)

• Merge ToonLit Material
  • VRM has material value animations
• Clear Endpoint Position
  • May break VRM SpringBones

Independent components (nothing to do)

• Remove Mesh By BlendShape
• Remove Mesh in Box
• Merge Bone
  • May break VRM SpringBones
• Merge PhysBone

Legacy or Non-VRM components (wontfix)

• UnusedBonesByReferencesTool
• Make Children

[kaikoga]

主に BlendShapeClip (VRM0) / Vrm10Expression (VRM1) のBlendShapeがIndex参照なのとRendererの指定方法がAvatarRootTransformからのRelativePathなのでいろいろと苦しいことになっています。

あといずれもScriptableObjectがScriptableObjectの参照を持つ形の（AnimationControllerに近い）データ構造なので、（AAOの）AnimatorControllerMapperによるDeepCloneっぽい扱いが必要です。とりあえず仮でAnimatorControllerMapperのDeepCloneに相乗りしてますが、この実装をMAにコピーする必要が起きる前にNDMFあたりにもう少し使いやすいDeepCloneのAPIを生えてると嬉しそうな気持ちがあります。

ちなみにVRM1のFirstPerson（一人称視点からどのRendererが表示されるか指定できる仕組み。言い換えると、VRM標準のMA Visible Head Accessory）はVrm10Objectに（つまり表情と一緒のScriptableObjectに）格納されるので、MAでFirstPersonをマージしたい時はMAでVrm10ObjectをDeepCloneできる必要があります。大変そう。

[kaikoga]

「AAOはVRMをサポートします」って言えるようになるまでにやらなきゃいけないAAO外の課題

bdunderscore/ndmf#71 （これを入れない限り、VRCSDKとUniVRMが両方入っているプロジェクトではVRCアバターしか扱えない）
bdunderscore/ndmf#72 （↑の とりあえず仮でAnimatorControllerMapperのDeepCloneに相乗りしてます をどう解消するか）