Working with colored light, in completely ambient-lit scene
In the game I'm currently working on, I've bumped into a weird lightning problem. The world is made of white, lit models, with a white ambient light, which renders everything completely white. Great so far.
Problem is, I want coloured light effects in the world. As the world is already 100% lit with white, the coloured lights of course have no effect.
Found another lost soul who had the same problem, but the only solution he found (and published) is not very satisfying...
I've come up with 2 solutions that might work, but need a missing piece:
Have white non-lit outline shaders, lit non-outlined toon shaders, and black ambient light, inverting the colors from the camera. (Problem here is multiple shaders on things like terrain)
Using projectors to project color instead. Problem is projectors only using cone shapes.
Any help or ideas how to solve this problem would be very much appreciated!