docs: public void getLocalMatrix(int boneindex, Matrix4f mtx)
      {
          Bone bone = mBones[boneindex];
  
          if ((bone.Changed & (WORLD_ROT | WORLD_POS)) != 0)
          {
              calcLocal(bone, mSkeleton.getParentBoneIndex(boneindex));
          }
          bone.getLocalMatrix(mtx);
      }