Hi, I wanted to recreate the effects used in the nvidia "Dawn"-demo and how they used the environment lighting. They created diffuse and specular cube maps used for environment lighting from a skybox. I didn't really understood how they created these maps. They used HDR Shop but I'm not sure if this was only used for the HDR calculations or these light-maps also. How is it best when transforming one skybox to cube maps used for environment lighting? I guess the 2nd looks like just blurring enough will probably ok - but is there a correct/precise way to do it? thank you :) normal (1), diffuse (2), specular (3) cube maps: