public static bool FastIntersects(this BoundingFrustum boundingfrustum, ref BoundingBox aabb)
{
if (boundingfrustum == null) {
return false;
}
Plane plane;
Vector3 normal, p;
plane = boundingfrustum.Bottom;
normal = plane.Normal;
normal.X = -normal.X;
normal.Y = -normal.Y;
normal.Z = -normal.Z;
p = aabb.GetPositiveVertex (ref normal);
if (-plane.D + normal.X * p.X + normal.Y * p.Y + normal.Z * p.Z < 0) {
return false;
}
plane = boundingfrustum.Far;
normal = plane.Normal;
normal.X = -normal.X;
normal.Y = -normal.Y;
normal.Z = -normal.Z;
p = aabb.GetPositiveVertex (ref normal);
if (-plane.D + normal.X * p.X + normal.Y * p.Y + normal.Z * p.Z < 0) {
return false;
}
plane = boundingfrustum.Left;
normal = plane.Normal;
normal.X = -normal.X;
normal.Y = -normal.Y;
normal.Z = -normal.Z;
p = aabb.GetPositiveVertex (ref normal);
if (-plane.D + normal.X * p.X + normal.Y * p.Y + normal.Z * p.Z < 0) {
return false;
}
plane = boundingfrustum.Near;
normal = plane.Normal;
normal.X = -normal.X;
normal.Y = -normal.Y;
normal.Z = -normal.Z;
p = aabb.GetPositiveVertex (ref normal);
if (-plane.D + normal.X * p.X + normal.Y * p.Y + normal.Z * p.Z < 0) {
return false;
}
plane = boundingfrustum.Right;
normal = plane.Normal;
normal.X = -normal.X;
normal.Y = -normal.Y;
normal.Z = -normal.Z;
p = aabb.GetPositiveVertex (ref normal);
if (-plane.D + normal.X * p.X + normal.Y * p.Y + normal.Z * p.Z < 0) {
return false;
}
plane = boundingfrustum.Top;
normal = plane.Normal;
normal.X = -normal.X;
normal.Y = -normal.Y;
normal.Z = -normal.Z;
p = aabb.GetPositiveVertex (ref normal);
if (-plane.D + normal.X * p.X + normal.Y * p.Y + normal.Z * p.Z < 0) {
return false;
}
return true;
}