What are some of the issues your facing with portals? I rewrote mine 2 weeks ago, and their working (mostly), but there were, a few problems...

1) The most obvious, collision. Objects still want to hit the walls behind the portal

2) Clipping. Say you have a 10 foot 2x4 going through the portal. You'd have to have two objects at each portal to correctly display it, but then they'd still be protruding through the back of the portal. Another way of avoiding this is by using some tricky extra views, but this can become very complicated

3) Double views. If you were looking at a portal through another view, it became distorted and improperly aligned. Perhaps you could get this fixed by doing some further management of your views...


...Looking forward to more results