1991-2006 Silicon Graphics, Inc.
glGetClipPlane 3G
glGetClipPlane return the coefficients of the specified clipping plane

## C Specification

void `glGetClipPlane` GLenum plane GLdouble * equation

## Parameters

plane

  Specifies a clipping plane. The number of clipping planes depends on the implementation, but at least six clipping planes are supported. They are identified by symbolic names of the form `GL_CLIP_PLANE` i where i ranges from 0 to the value of `GL_MAX_CLIP_PLANES` - 1.

equation

  Returns four double-precision values that are the coefficients of the plane equation of plane in eye coordinates. The initial value is (0, 0, 0, 0).

## Description

`glGetClipPlane` returns in equation the four coefficients of the plane equation for plane.

## Notes

It is always the case that `GL_CLIP_PLANE` i = `GL_CLIP_PLANE0` + i.

If an error is generated, no change is made to the contents of equation.

## Errors

`GL_INVALID_ENUM` is generated if plane is not an accepted value.

`GL_INVALID_OPERATION` is generated if `glGetClipPlane` is executed between the execution of glBegin and the corresponding execution of glEnd.

## See Also

glClipPlane

## Copyright

Copyright 1991-2006 Silicon Graphics, Inc. This document is licensed under the SGI Free Software B License. For details, see http://oss.sgi.com/projects/FreeB/.