Pseudo gamma correction

As several lights add up in the scene, several accumulations happen in the background, flattening average contrast and luminance. In order to have the colorful scene back, we can tweak the accumulation buffer a bit using the GL_MULT function of glAccum API, and passing as multiplication factor the result of 1+γ*numberOfLightSources.

Here's a screenshot:


compared to the previous images, also with γ=.2 the improvement is pretty evident.