Validate Linear Space for Two Bounces

In this example, we validate our approximate roughness for two light bounce on parallel interfaces with a GGX microfacet model. Slider on the right of the screen allows to change the roughness of the first interface (that we show as the input angular distribution, on the left), or the roughness of the second interface.



input angular distribution
 
reflected angular distribution
 
approximated reflected angular distribution
 
alpha1:01  
alpha2: 01  



scale: 010  
gamma: 03