(glFrustum left right bottom top nearVal farVal)

glFrustum multiplies the current matrix by a perspective matrix.

Parameter	Description
left	Coordinates for left vertical clipping plane
right	Coordinates for right vertical clipping plane
bottom	Coordinate for bottom horizontal clipping plane
top	Coordinate for top horizontal clipping plane
nearVal	Distances to near depth clipping plane (>0)
farVal	Distances to far depth clipping planes (>0)

Example

Example 1: From DemoCube's custom rendering function

(glFrustum -1.0 1.0 -1.0 1.0 1.5 20.0)