I'm trying to make a custom sky shader. But if even a direct copy don't work (doesn't matter which standard sky shader i copy) i can't go further customizing it. This is weird, since i followed exactly the gtk radiant manual. And the shaders do work principally, except for the illumination of my map.

I have a problem. I have a map in radiant. If i assign a standard QL sky shader to the sky-brush, the map is correctly illuminated (skybox will illuminate map textures) Now, if i simply copy that shader (from QL pak00 scripts/skies.shader) to my custom mapname.shader file, and assign that shader to ...