public override float Sample(Surfel surfel, out Vector3 wi, Vector2 sample, out float pdf)
{
float res;
var f = fresnel.Evaluate(Vector3.Dot(surfel.normal, surfel.ray));
if (sample.X < f)
{
res = reflection.Sample(surfel, out wi, sample, out pdf);
pdf = f;
}
else
{
res = transmission.Sample(surfel, out wi, sample, out pdf);
pdf = 1 - f;
}
return(res);
}
public override float Sample(Surfel surfel, out Vector3 wi, out float pdf)
{
return(brdf.Sample(surfel, out wi, Mathf.CreateSample(), out pdf));
}