// The front plan is at 0 (the intersection of the 4 side planes). Plane normals should point out.
public Frustum(Vector3 leftNormal, Vector3 rightNormal,
Vector3 bottomNormal, Vector3 topNormal,
Vector3 backNormal, double distanceToBack)
{
Planes = new Plane[5];
Planes[0] = new Plane(leftNormal.GetNormal(), 0);
Planes[1] = new Plane(rightNormal.GetNormal(), 0);
Planes[2] = new Plane(bottomNormal.GetNormal(), 0);
Planes[3] = new Plane(topNormal.GetNormal(), 0);
Planes[4] = new Plane(backNormal.GetNormal(), distanceToBack);
}
public Plane(Vector3 planeNormal, Vector3 pointOnPlane)
{
this.Normal = planeNormal.GetNormal();
this.DistanceFromOrigin = Vector3Ex.Dot(planeNormal, pointOnPlane);
}
public Plane(Vector3 planeNormal, double distanceFromOrigin)
{
this.Normal = planeNormal.GetNormal();
this.DistanceFromOrigin = distanceFromOrigin;
}
public Plane(Vector3 planeNormal, Vector3 pointOnPlane)
{
this.planeNormal = planeNormal.GetNormal();
this.distanceToPlaneFromOrigin = Vector3.Dot(planeNormal, pointOnPlane);
}