ReSTIR PMGI - Even Faster Ray Traced GI with Virtual Lights

Directional ReGIR

When rendering scenes with a large number of lights, efficiently sampling those light sources is an important consideration. Uniform random sampling is unlikely to give good results, as for a given surface a large proportion of lights in the scene may provide little to no illumination. Therefore, there exist several techniques for light sampling which aim to efficiently sample light sources which provide meaningful lighting to a given point.

ReSTIR GSGI - Fast Ray Traced GI with Virtual Lights