+VG_STATIC void entity_bh_expand_bound( void *user, boxf bound, u32 item_index );
+VG_STATIC float entity_bh_centroid( void *user, u32 item_index, int axis );
+VG_STATIC void entity_bh_swap( void *user, u32 ia, u32 ib );
+VG_STATIC void entity_bh_debug( void *user, u32 item_index );
+
+static bh_system bh_system_entity_list = {
+ .expand_bound = entity_bh_expand_bound,
+ .item_centroid = entity_bh_centroid,
+ .item_closest = NULL,
+ .item_swap = entity_bh_swap,
+ .item_debug = entity_bh_debug,
+ .cast_ray = NULL
+};
+