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 );
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 );