public static void m3()
{
Ray3D r1 = new Ray3D(startPoint: new XYZ(), endPoint: new XYZ(1, 1, 1));
Ray3D r2 = new Ray3D(startPoint: new XYZ(1, 0, 0), endPoint: new XYZ(0, 0.45, 0.4501));
//
var a1 = r1.IsCoplanarWith(r2);
var a2 = r1.IntersectWith(r2);
}