public static double[] RayPlaneParametric(Ray3 ray, Plane3 plane, double tol = MathUtil.Epsilon)
{
Vector3 u = ray.Direction;
Vector3 w = ray.Position - plane.Origo;
double d = plane.Normal.Dot(u);
double n = -plane.Normal.Dot(w);
if (Math.Abs(d) < tol)
{
return(empty_array); //parallel
}
return(RealArray(n / d));
}