float rough_q = roughness * roughness;
rough_q *= rough_q;
float denom = n_dot_h*n_dot_h*(rough_q-1)+1;
- // Scale by pi to get a result per steradian, suitable for integration
+ /* Scale by pi to normalize the total area of the microfacets as projected
+ to the macrosurface */
return rough_q/(PI*denom*denom);
}