glGetClipPlane
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## Name

glGetClipPlane — return the coefficients of the specified clipping plane

## C Specification

`void `glGetClipPlane`` | `(` | `GLenum `plane`, GLdouble *`equation`);`

## Python Specification

``glGetClipPlane`` | `(` | ``plane`) → `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`.

## See Also

glClipPlane

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