public Triangle3D(Point3D v1, Point3D v2, Point3D v3)
{
V1 = v1;
V2 = v2;
V3 = v3;
normalFunc = Point3D.Cross(V3 - V1, V2 - V1).Normalize;
}
public Triangle3D(Point3D v1, Point3D v2, Point3D v3, Point3D normal)
{
_normal = normal;
normalFunc = normal.Normalize;
}
