Frustum constructor
Implementation
Frustum([Plane? p0, Plane? p1, Plane? p2, Plane? p3, Plane? p4, Plane? p5]) {
planes = [
(p0 != null) ? p0 : Plane(null, null),
(p1 != null) ? p1 : Plane(null, null),
(p2 != null) ? p2 : Plane(null, null),
(p3 != null) ? p3 : Plane(null, null),
(p4 != null) ? p4 : Plane(null, null),
(p5 != null) ? p5 : Plane(null, null)
];
}