# glGetClipPlane.3G - Man Page

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 0 ≤ $i$ < GL_MAX_CLIP_PLANES.

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.