merge in changes from web/js branch by hand (bone animation updates)

ios/include/SceneAsset.hpp

@@ -62,17 +62,17 @@ namespace polyvox {
     // Use this to construct a dynamic (i.e. non-glTF embedded) bone/joint animation.
     //
     struct BoneAnimation : AnimationStatus {
-        uint8_t boneIndex;
+        size_t boneIndex;
         vector<utils::Entity> meshTargets;
         size_t skinIndex = 0;
         int lengthInFrames;
         float frameLengthInMs = 0;
-        vector<math::quatf> frameData;
+        vector<math::mat4f> frameData;
     };
 
     struct SceneAsset {
         FilamentAsset* asset = nullptr;
-        
+        vector<math::mat4f> initialJointTransforms;
         vector<GltfAnimation> gltfAnimations;
         vector<MorphAnimation> morphAnimations;
         vector<BoneAnimation> boneAnimations;