def __init__(self, parent_stage, name="Cubemap", size=128):
        """ Inits the filter from a given stage """
        RPObject.__init__(self)
        self._stage = parent_stage
        self._name = name
        self._size = size
        self._make_maps()
 Inits the filter from a given stage 
metadrive/render_pipeline/rpcore/util/cubemap_filter.py