// Even if some of the door is out of LOS, we want the entire
            // door to be updated.  Hitting this case requires a really big
            // door!
            // Should set_terrain_changed() be used, too?
            if (is_terrain_seen(dc))
                set_envmap_obj(dc.x, dc.y, DNGN_OPEN_DOOR);

            grd[dc.x][dc.y] = DNGN_CLOSED_DOOR;

            grd(dc) = DNGN_CLOSED_DOOR;
            // Even if some of the door is out of LOS once it's closed (or even
            // if some of it is out of LOS when it's open), we want the entire
            // door to be updated.
            // Should set_terrain_changed() be used, too?
            if (is_terrain_seen(dc))
                set_envmap_obj(dc.x, dc.y, DNGN_CLOSED_DOOR);