ZDoom

Having a skybox disables portals created with Sector_SetPortal if the sector that's being looked into through the portal has a skybox sky. However, using portal things works fine on this particular case. Shouldn't they both be treated the same way?

Edit: Actually, it seems having a skybox in general causes portals to act terribly fuzzy and unpredictable, sometimes working and sometimes not.

Demo map, please! I tested with KDiZD Z1M1 and saw no problems. And that portal even uses F_SKY1 as ceiling texture.

fixed. Seems I was a bit too careful when checking if a sector should get a portal. The normal skybox took precedence which it shouldn't have.

Aha. Alright then, thanks for the help.