The toolsskybox-texture in my map seems to behave similar to vertex textures. From certain angles it works almost fine and you can see the example crane placed in the 3D skybox, from other angles the texture becomes bright white.

The used skybox texture is the standard sky_black, fog_controller preset is darkness from the global_ents and there is a light environment.

Does anyone have an idea what might cause this?

2wLwvSdjp94

Hey mate

There are two kinds of stock sky_black skies, try to other one called sky_black_nofog in order to check if it's the fog_controller that is messing with the fog values of your sky...

Also what fog seetings have you got in the sky_camera?

josepezdj wrote:
[C]heck if it's the fog_controller that is messing with the fog values of your sky...

Looks like it is
It's the exact same effect in this tutorial you referred to in the past.
http://forums.thinking.withportals.com/post64983.html#p64983

The sky_camera has that same "fog blend" attribute. Maybe you turned that on accidentally?

HMW wrote:
The sky_camera has that same "fog blend" attribute. Maybe you turned that on accidentally?

Indeed I had. Tunring it off fixed it. Thanks.