I know the only reason I've personally wanted to make 3d games is for them to have that Tomb Raider 1 lookHere's an example of a shader for Unity:
Here's a reddit discussion and a link to the github: https://www.reddit.com/r/Unity3D/com..._shaders_that/
z-fighting, polygon quantize jitter, affine texture mapping and lower framerate (not gameplay speed but rendered framerate) all play a part in this. Would something like this be possible in firefly?