# glGetClipPlane.3G man page

**glGetClipPlane** ā 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 ā¤ $i$ <**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**.