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Minimal Alien Vision

Minimal Alien Vision Mod mod makes alien and marine players and structures glow, while leaving everything else the same. A small amount of edge highlighting makes navigating pitch black rooms a snap.

If you connect to a server that isn't checking consistency on shaders/DarkVision.fx, you will get the modded alien vision. If the server is checking consistency on that file (which it will by default), then you won't get it. It's totally up to the sever operators whether or not they want to allow people to use certain types of mods.