Gl.DepthRange (gb.opengl)

Specify mapping of depth values from normalized device coordinates to window coordinates.

Parameters

nearVal

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

farVal

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. Gl.DepthRange 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 Gl.DepthRange 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 nearVal be less than farVal. Reverse mappings such as $\mathit{nearVal}<code\; style="white-space:nowrap;"></code>\; <mn>1</mn>$, and $\mathit{farVal}<code\; style="white-space:nowrap;"></code>\; <mn>0</mn>$ are acceptable.

Associated Gets

Gl.Get with argument Gl.DEPTH_RANGE

See also

See original documentation on OpenGL website