UniformTileSet ots = loadPortalTileSet();
_portobjs.clear();
for (Iterator<Portal> iter = _scene.getPortals(); iter.hasNext(); ) {
Portal portal = iter.next();
StageLocation loc = (StageLocation) portal.loc;
Point p = getScreenCoords(loc.x, loc.y);
int tx = MisoUtil.fullToTile(loc.x);
int ty = MisoUtil.fullToTile(loc.y);
Point ts = MisoUtil.tileToScreen(_metrics, tx, ty, new Point());