
Now how can i pass over the door by the house roof? the door is a solid polyobj..
Thanks.

That's not true. http://forum.zdoom.org/viewtopic.php?f= ... 36#p561721David Ferstat wrote: Be that as it may, you need to remember, and you've already been told, that polyobjects go from floor to ceiling of the sector they're in. If you can't walk through them, you also can't walk over or under them.
A 3D model won't work, since an actor can only have 1 radius, not 2. Regardless of how your model looks, the collision behavior is that of a square base with a height set by the actor height. Won't be of much use as a door.David Ferstat wrote:WTF is "Traspasable"?
Be that as it may, you need to remember, and you've already been told, that polyobjects go from floor to ceiling of the sector they're in. If you can't walk through them, you also can't walk over or under them.
As an alternative, consider using a 3D model in GZDoom for the door. Check out the [wiki]MODELDEF[/wiki] page.