code: public void setPosition(Vector3f pos)
      {
          mPose.setPosition(pos.x, pos.y, pos.z);
      }
docs: Sets the world space position of the skeleton.
  <p>
  @param pos world space position of the skeleton.
  <p>
  The world space position of the skeleton is the translation of
  the root bone (index 0) of the current pose. Setting the skeleton position
  directly updates both the root bone position and the translation
  on the target model of the skeleton.
  @see GVRPose#setWorldPositions