glGetClipPlane — return the coefficients of the specified clipping 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
where i ranges from 0 to the value of
GL_MAX_CLIP_PLANES - 1.
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
It is always the case that
If an error is generated,
no change is made to the contents of
GL_INVALID_ENUM is generated if
plane is not an accepted value.
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