Frustum 그리기

Camera position : p

Camera View : v

Camera Near : n

Camera Far : f

Camera Fov : fov

Camera aspect : aspect

nearDist = p + ( v * n );

farDist = p + ( v * f );

Hnear = 2.0f * ( Tan( fov /2.0f) * nearDist );

Wnear = Hnear * aspect;

Hfar = 2.0f * ( Tan( fov/2.0f) * farDist );

Wfar = Hfar * aspect;

ftl = farDist + ( up * ( Hfar / 2.0f ) ) - ( Camera.right * ( Wfar / 2.0f ) );

그림 출처 : http://www.lighthouse3d.com/tutorials/view-frustum-culling/