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Returns the patch type or serial number. This function can be used to decide whether a certain polygon
is a patch or not. If the polygon is not a patch then 0 is returned.
to learn more about the different types of patches please see
STATE_polygon_delete_patches(), STATE_engine_create_shadow(), STATE_polygon_add_patch() ,STATE_polygon_add_patch_easy()
STATE_group_delete_patches()
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