@brief Default constructor reset all value to be zero.

@brief Default constructor reset all value to be zero.

@brief Constructor. @param scene The current rendering scene.

connect light sample

connect vertices

generate 2d distribution

initialize data

private method of li

helper functio to blend coefficients for fourier

@brief This is a helpf function transforming vector from local coordinate to shading coordinate. Bxdf is only responsible for transforming vector fr

@brief Transform a vector from local coordinate to shading coordinate. Just like the above function transforming vectors from local coordinate to sh

It is necessary to avoid g equals to 1 or -1, which turns this phase function into a Dirac-Delta function, easily leading to some problems. Instead of

UE4's way of converting roughness to alpha http://graphicrants.blogspot.com/2013/08/specular-brdf-reference.html

setup a new fiber