**NAME**
**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 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**