Function frustum

Build an frustum perspective projection matrix with NDC and DepthClip selected at runtime


						
				Mat4!T frustum(T)
				(
				

				  NDC ndc,
				

				  in T l,
				

				  in T r,
				

				  in T b,
				

				  in T t,
				

				  in T n,
				

				  in T f
				

				);

Parameters

Name	Description
ndc	the target NDC
l	X position of the left edge at the near plane
r	X position of the right edge at the near plane
b	Y position of the bottom edge at the near plane
t	Y position of the top edge at the near plane
n	distance from origin to near plane (in Z-)
f	distance from origin to far plane (in Z-)

Returns

a matrix that maps from eye space to clip space. To obtain NDC, the vector must be divided by w.