Name

glDepthRange — specify mapping of depth values from normalized device coordinates to window coordinates

C Specification

void glDepthRangef(GLclampf near,
 GLclampf far);
 
void glDepthRangex(GLclampx near,
 GLclampx far);
 

Parameters

near

Specifies the mapping of the near clipping plane to window coordinates. The initial value is 0.

far

Specifies the mapping of the far clipping plane to window coordinates. The initial value is 1.

Description

After clipping and division by w, depth coordinates range from -1 to 1, corresponding to the near and far clipping planes. glDepthRange specifies a linear mapping of the normalized depth coordinates in this range to window depth coordinates. Regardless of the actual depth buffer implementation, window coordinate depth values are treated as though they range from 0 through 1 (like color components). Thus, the values accepted by glDepthRange are both clamped to this range before they are accepted.

The setting of (0, 1) maps the near plane to 0 and the far plane to 1. With this mapping, the depth buffer range is fully utilized.

Notes

It is not necessary that near be less than far. Reverse mappings such as near = 1 , and far = 0 are acceptable.

See Also

glDepthFunc, glPolygonOffset, glViewport

Copyright

Copyright © 2003-2004 Silicon Graphics, Inc. This document is licensed under the SGI Free Software B License. For details, see http://oss.sgi.com/projects/FreeB/.