Manual Reference Pages - GLGETCLIPPLANE (3)
glGetClipPlane - return the coefficients of the specified clipping plane
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
It is always the case that GL_CLIP_PLANEi = GL_CLIP_PLANE0 + i.
If an error is generated,
no change is made to the contents of equation.
GL_INVALID_ENUM is generated if plane is not an accepted value.
GL_INVALID_OPERATION is generated if glGetClipPlane
is executed between the execution of glBegin
and the corresponding execution of glEnd.
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