Hello

I started working on my first map and  ran into some trouble. There are these really nasty lighting artifacts that appear all throughout my map and I have no idea how to fix them. Even putting a light grid volume didn't help. I'm hoping someone can identify the problem and give me advice on how to fix it.

Thanks in advance.

Here are some screenshots: http://imgur.com/a/R4MJB

You need to add lightgrid around your map (lightgrid volume brush) and caulkbox. Just make caulbox around the whole map, hit hollow and texture only inside faces with skytexture

I actually already have all of that and my map still looks like the screenshots that I linked to.

What Hitman said, also you can lower the contrast_gain KVP on your worldspawn which removes the artifacts.

Do I have to play around with the value or is there a standard value that I should use?

Also, if it helps, my map is night-themed yet even though I have a night skybox active, there are still shadows that show up on the outside and even inside of buildings in my map from the "sun". Don't know if that somehow ties in with the artifacts.