Axiom.Core.Camera.GetCameraToViewportBoxVolume C# (CSharp) Метод

        public void GetCameraToViewportBoxVolume(Real screenLeft, Real screenTop, Real screenRight, Real screenBottom,
            PlaneBoundedVolume outVolume, bool includeFarPlane)
        {
            outVolume.planes.Clear();

            if (ProjectionType == Projection.Perspective)
            {
                // Use the corner rays to generate planes
                var ul = GetCameraToViewportRay(screenLeft, screenTop);
                var ur = GetCameraToViewportRay(screenRight, screenTop);
                var bl = GetCameraToViewportRay(screenLeft, screenBottom);
                var br = GetCameraToViewportRay(screenRight, screenBottom);

                // top plane
                var normal = ul.Direction.Cross(ur.Direction);
                normal.Normalize();
                outVolume.planes.Add(new Plane(normal, DerivedPosition));

                // right plane
                normal = ur.Direction.Cross(br.Direction);
                normal.Normalize();
                outVolume.planes.Add(new Plane(normal, DerivedPosition));

                // bottom plane
                normal = br.Direction.Cross(bl.Direction);
                normal.Normalize();
                outVolume.planes.Add(new Plane(normal, DerivedPosition));

                // left plane
                normal = bl.Direction.Cross(ul.Direction);
                normal.Normalize();
                outVolume.planes.Add(new Plane(normal, DerivedPosition));
            }
            else
            {
                // ortho planes are parallel to frustum planes

                var ul = GetCameraToViewportRay(screenLeft, screenTop);
                var br = GetCameraToViewportRay(screenRight, screenBottom);

                UpdateFrustumPlanes();
                outVolume.planes.Add(new Plane(FrustumPlanes[(int)FrustumPlane.Top].Normal, ul.Origin));
                outVolume.planes.Add(new Plane(FrustumPlanes[(int)FrustumPlane.Right].Normal, br.Origin));
                outVolume.planes.Add(new Plane(FrustumPlanes[(int)FrustumPlane.Bottom].Normal, br.Origin));
                outVolume.planes.Add(new Plane(FrustumPlanes[(int)FrustumPlane.Left].Normal, ul.Origin));
            }

            // near/far planes applicable to both projection types
            outVolume.planes.Add(new Plane(FrustumPlanes[(int)FrustumPlane.Near]));
            if (includeFarPlane)
                outVolume.planes.Add(new Plane(FrustumPlanes[(int)FrustumPlane.Far]));
        }