I'm having this weird lighting bug where flat brush faces are being lit differently under the same light_environment. By playing around with Hammer++'s texture UV settings I've found out that faces are lit evenly if their UV coordinates are all kept the same. However, I'm not interested in having the same UVs for every face, as I want to have rotated textures. Additionally, if I set mat_bumpmap in Garry's Mod's console to 0, the issue is resolved, but then my map looks bleached. Here's a picture of the issue in case my explanation sucks:
Any help is much appreciated.
image embed fixed. Make sure image links end with a file extension (e.g. jpeg) - mod