# GLGETCLIPPLANE

Section: Misc. Reference Manual Pages (3G)

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## NAME

**glGetClipPlane**
- return the coefficients of the specified clipping plane

## C SPECIFICATION

void

**glGetClipPlane**(
GLenum

*plane*,

GLdouble **equation* )

delim $$

## 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(3G)**