'\" e '\"macro stdmacro .ds Vn Version 1.2 .ds Dt 24 September 1999 .ds Re Release 1.2.1 .ds Dp May 22 14:45 .ds Dm 5 May 22 14: .ds Xs 48616 4 .TH GLGETCLIPPLANE 3G .SH NAME .B "glGetClipPlane \- return the coefficients of the specified clipping plane .SH C SPECIFICATION void \f3glGetClipPlane\fP( GLenum \fIplane\fP, .nf .ta \w'\f3void \fPglGetClipPlane( 'u GLdouble \fI*equation\fP ) .fi .EQ delim $$ .EN .SH PARAMETERS .TP \w'\fIequation\fP\ \ 'u \f2plane\fP 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 \%\f3GL_CLIP_PLANE\fP$i$ where 0 \(<= $ i $ < \%\f3GL_MAX_CLIP_PLANES\fP. .TP \f2equation\fP Returns four double-precision values that are the coefficients of the plane equation of \f2plane\fP in eye coordinates. The initial value is (0, 0, 0, 0). .SH DESCRIPTION \%\f3glGetClipPlane\fP returns in \f2equation\fP the four coefficients of the plane equation for \f2plane\fP. .SH NOTES It is always the case that \%\f3GL_CLIP_PLANE\fP$i$ = \%\f3GL_CLIP_PLANE0\fP + $i$. .P If an error is generated, no change is made to the contents of \f2equation\fP. .SH ERRORS \%\f3GL_INVALID_ENUM\fP is generated if \f2plane\fP is not an accepted value. .P \%\f3GL_INVALID_OPERATION\fP is generated if \%\f3glGetClipPlane\fP is executed between the execution of \%\f3glBegin\fP and the corresponding execution of \%\f3glEnd\fP. .SH SEE ALSO \%\f3glClipPlane\fP