if (f.special_tiles[0].texture) {
				float llev = ((float)n.getParam2() / 255.0 )*2.0-1.0;
				TileSpec tile_liquid = f.special_tiles[0];
				box=aabb3f(-b, -a+0.001,-b, b, a*llev-0.001, b);
				box.MinEdge += pos;
				box.MaxEdge += pos;
				makeCuboid(&collector, box, &tile_liquid, 1, c, NULL);
			}