docs: public void setLocalMatrix(int boneindex, Matrix4f mtx)
      {
          Bone	  bone = mBones[boneindex];
          int		  parentid = mSkeleton.getParentBoneIndex(boneindex);
  
          bone.LocalMatrix.set(mtx);
          bone.Changed = Bone.LOCAL_ROT;
          if (parentid < 0)
          {
              bone.WorldMatrix.set(bone.LocalMatrix);
          }
          else
          {
              mNeedSync = true;
          }
          if (sDebug)
          {
  
              Log.d("BONE",
                    "setLocalMatrix: %s %s",
                    mSkeleton.getBoneName(boneindex),
                    bone.toString());
          }
      }