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 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).
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glGetClipPlanereturns in equation the four coefficients of the plane equation for plane.