GLGETCLIPPLANE(3G) UNIX Programmer's Manual GLGETCLIPPLANE(3G)
glGetClipPlane - return the coefficients of the specified
clipping plane
void glGetClipPlane( GLenum plane,
GLdouble *equation )
plane Specifies a clipping plane. The number of clipping
planes depends on the implementation, but at least
six clipping planes are supported. They are iden-
tified by symbolic names of the form
GL_CLIP_PLANEi where 0 ≤ i < GL_MAX_CLIP_PLANES.
equation 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 +
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 exe-
cuted between the execution of glBegin and the corresponding
execution of glEnd.
glClipPlane(3G)
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