// BSDF Public Methods
public Bsdf(SurfaceInteraction si, double eta = 1.0)
{
Eta = eta;
_ns = si.ShadingN;
_ng = si.N;
_ss = si.ShadingDpdu.Normalize();
_ts = _ns.Cross(_ss);
}
private static Ray3D ComputeIntersectionLine(ref Plane3D p1, ref Plane3D p2)
{
Ray3D ray = new Ray3D
{
Direction = (Vector3D)Normal3D.Cross(p1.Normal, p2.Normal)
};
float num = ray.Direction.LengthSquared();
ray.Origin = (Point3D)(Vector3D.Cross((-p1.D * p2.Normal) + (p2.D * p1.Normal), ray.Direction) / num);
return(ray);
}