private Ray GetRefractionRay(PosVector p, PosVector n, PosVector v, double refraction)
{
var c1 = n.Dot(v);
var c2 = 1.0 - refraction * refraction * Math.Sqrt(1.0 - c1 * c1);
var t = (n * (refraction * c1 - c2) - v * refraction * -1.0).Normalize();
return(new Ray(p, t));
}
private Ray ReflectRay(Ray sourceRay, PosVector normal)
{
return(new Ray(
sourceRay.Position,
sourceRay.Direction + normal * 2.0 * -normal.Dot(sourceRay.Direction)));
}
public static double CosVectors(PosVector v1, PosVector v2)
{
return(v1.Dot(v2) / Math.Sqrt(v1.MagnitudeSquared() * v2.MagnitudeSquared()));
}
private Ray GetReflectionRay(PosVector p, PosVector n, PosVector v)
{
var rl = v + n * 2.0 * -n.Dot(v);
return(new Ray(p, rl));
}