Everything is pitch-black in-game even though I already have a WorldEnvironment3D, Environment, Sky, and DirectionalLight3D, and it all looks normal in the editor view. This also just began all of a sudden, it was normal before, and I don’t know if I accidentally did something.
Huh. Ok. They do not appear to be. In that case, I would recommend creating a new test level, adding the default WorldEnvironment and DirectionalLight3D and seeing if that shows up. I suspect it will not, but it will confirm you didn’t bump any settings.
Re-reading your initial post, I see this came on suddenly. My guess would be you updated your videocard drivers - or they automatically updated for you.
If you are on Windows, I would change your renderer to Direct3D. That will likely fix the problem.
Turns out that there was some weird problem I wasn’t able to find out with the DirectionalLight3D. Maybe it was some accidentally set property. I replaced it with a new one and it fixed it.
Not negative values. There is a check box that when checked will remove light from everything that light is shining on, that chebox is named negative. If removing the light fixed it that could’ve been the issue