public Frustum(Matrix vp) {
Planes = new[] {
//left
new Plane(vp.M14 + vp.M11, vp.M24 + vp.M21, vp.M34 + vp.M31, vp.M44 + vp.M41),
// right
new Plane(vp.M14 - vp.M11, vp.M24 - vp.M21, vp.M34 - vp.M31, vp.M44 - vp.M41),
// bottom
new Plane(vp.M14 + vp.M12, vp.M24 + vp.M22, vp.M34 + vp.M32, vp.M44 + vp.M42),
// top
new Plane(vp.M14 - vp.M12, vp.M24 - vp.M22, vp.M34 - vp.M32, vp.M44 - vp.M42),
//near
new Plane(vp.M13, vp.M23, vp.M33, vp.M43),
//far
new Plane(vp.M14 - vp.M13, vp.M24 - vp.M23, vp.M34 - vp.M33, vp.M44 - vp.M43)
};
foreach (var plane in Planes) {
plane.Normalize();
}
}