glGetClipPlane - return the coefficients of the specified
GLdouble *equation );
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_PLANEi where 0 <= i <
GL_MAX_CLIP_PLANES. 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).
glGetClipPlane() returns in equation the four coefficients
of the plane equation for plane.
It is always the case that GL_CLIP_PLANEi = GL_CLIP_PLANE0
If an error is generated, no change is made to the contents
GL_INVALID_ENUM is generated if plane is not an accepted
GL_INVALID_OPERATION is generated if glGetClipPlane() is
executed between the execution of glBegin() and the corresponding
execution of glEnd().
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