[SOLVED] How to add custom textures to a map on workshop
I tried using search, google, developer.valvesoftware.com, youtube and everything but found no answer.
i am having a little issue with pakrat, see these results:


Steps done:
Custom folder in /materials with subfolders containing custom textures;
compiles bsp and used pakrat to add these custom textures;
uploaded resulting bsp to workshop;
moved custom folder with all custom textures to another location out of portal;
subscibed to my own map and downloaded, launched and played.
Why are Portal props loosing their textures having had added custom textures via Pakrat?
First type "buildcubemaps" into the console to get all reflections in the map and after that use Packrat!
I hope you have some env_cubemaps in your map.
What you can see in your picture is a result of missing reflection textures. The default reflection is very bright, thats why your models seem to be very bright.
If there would be missing textures, the props would have a black-pink error texture.
Just by curiousity: Why is there no issue at all as displayed below, if i upload the original non-packed bsp to the workshop while having the custom textures still in /materials?

non-packed bsp having used custom textures in portal/materials
Worst mistake: I renamed the bsp file on save from Pakrat and uploaded that renamed file to the Workshop. Bad idea! Lesson learned: Do not rename the bsp after cubemaps had been build!
I am still not happy with the finally appearing light setup of the map, which looks at many locations very different to what i tried to achive and how it did look via Fast compilation e.g. the car park at the entrance is far to dark. Furthermore i am still not sure if i should have done more than just enter 'buildcubemaps' via developer console, because the Vale Wiki tells me more to do:
https://developer.valvesoftware.com/wiki/Cubemaps
Finally i have no idea how a should reload a map into Portal as mentioned in that Wiki - there should be something smarter than recomplie the map each time via Hammer's Run Map. Guess, i am missing something.
Here the result in case of curiousity:
http://steamcommunity.com/sharedfiles/filedetails/?id=81975915
Again: I am still not happy with the light in that map.