- return the coefficients of the specified clipping plane



C SPECIFICATION


PARAMETERS

       _param1  Specifies  a clipping plane.  The number of clip-
                ping planes depends on the implementation, but at
                least  six  clipping  planes are supported.  They
                are identified by  symbolic  names  of  the  form
                GL_CLIP_PLANEi where 0 <= i < GL_MAX_CLIP_PLANES.

       _param2  Returns four double-precision values that are the
                coefficients  of the plane equation of _param1 in
                eye coordinates.  The initial value is (0, 0,  0,
                0).


DESCRIPTION

       glGetClipPlane returns in _param2 the four coefficients of
       the plane equation for _param1.


NOTES

       It is always the case that GL_CLIP_PLANEi = GL_CLIP_PLANE0
       + i.

       If  an  error  is generated, no change is made to the con-
       tents of _param2.


ERRORS

       GL_INVALID_ENUM is generated if _param1 is not an accepted
       value.

       GL_INVALID_OPERATION  is  generated  if  glGetClipPlane is
       executed between the execution of glBegin and  the  corre-
       sponding execution of glEnd.


SEE ALSO

       glClipPlane



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