I don't like skylights. They're coarse and rough and irritating and they get everywhere. But I digress... For those with dark tunnel and other underground sections, you may be wondering if the annoying sky light, which seems to penetrate everything like it was made entirely of x-rays, can be turned off or lessened. It can: I'm still getting used to everything you can do with blueprints. I plan to add a spline to this blueprint, and have it measure the player's relation to it for a gradual transition, shortly before/after they exit/enter a tunnel, respectively. Also this fixes the "glowing rails" problem! Just be sure not to fire off the get all actors node too often, like the tooltip will tell you. Storing it in a variable should work nicely.