release() {
    Batch.prototype.release.call(this);
    this.occluder = null;
  }
*************************************************************************
 BatchLighting
 var BatchLighting = Batch
 BatchLighting.create()
 - BatchLighting only records the occluder verts/uv per light, and always matches the maximum number of lights.
 - Uses the global FX lights array buffers to supply per light info, which saves space and centralizes.
**************************************************************************