d><p>Modify the tile or tiles to only allow collisions from certain directions, use FlxObject constants NONE, ANY, LEFT, RIGHT, etc. Default is "ANY".</p></td></tr><tr><th style="width:25%;"><code>Callback</code></th><td><p>The function to trigger, e.g. lavaCallback(Tile:FlxObject, Object:FlxObject).</p></td></tr><tr><th style="width:25%;"><code>CallbackFilter</code></th><td><p>If you only want the callback to go off for certain classes or objects based on a certain class, set that class here.</p></td></tr>