glClipPlane man page on YellowDog

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GLCLIPPLANE(3G)						       GLCLIPPLANE(3G)

NAME
       glClipPlane - specify a plane against which all geometry is clipped

C SPECIFICATION
       void glClipPlane( GLenum plane,
			 const GLdouble *equation )

PARAMETERS
       plane	 Specifies which clipping plane is being positioned.  Symbolic
		 names of the form  GL_CLIP_PLANEi,  where  i  is  an  integer
		 between 0 and GL_MAX_CLIP_PLANES−1, are accepted.

       equation	 Specifies  the	 address  of an array of four double-precision
		 floating-point values.	 These values  are  interpreted	 as  a
		 plane equation.

DESCRIPTION
       Geometry	 is always clipped against the boundaries of a six-plane frus‐
       tum in x, y, and z.  glClipPlane allows the specification of additional
       planes,	not  necessarily perpendicular to the x, y, or z axis, against
       which all geometry is clipped.  To  determine  the  maximum  number  of
       additional   clipping   planes,	 call	glGetIntegerv	with  argument
       GL_MAX_CLIP_PLANES. All implementations support at least six such clip‐
       ping planes.  Because the resulting clipping region is the intersection
       of the defined half-spaces, it is always convex.

       glClipPlane specifies a half-space using a four-component  plane	 equa‐
       tion.   When  glClipPlane  is  called,  equation	 is transformed by the
       inverse of the modelview matrix and stored in the resulting eye coordi‐
       nates.	Subsequent  changes  to the modelview matrix have no effect on
       the stored plane-equation components.  If the dot product  of  the  eye
       coordinates  of	a  vertex with the stored plane equation components is
       positive or zero, the vertex is in with respect to that clipping plane.
       Otherwise, it is out.

       To enable and disable clipping planes, call glEnable and glDisable with
       the argument GL_CLIP_PLANEi, where i is the plane number.

       All clipping planes are initially defined as (0, 0, 0, 0) in eye	 coor‐
       dinates and are disabled.

NOTES
       It is always the case that GL_CLIP_PLANEi = GL_CLIP_PLANE0+i.

ERRORS
       GL_INVALID_ENUM is generated if plane is not an accepted value.

       GL_INVALID_OPERATION  is	 generated  if glClipPlane is executed between
       the execution of glBegin and the corresponding execution of glEnd.

ASSOCIATED GETS
       glGetClipPlane
       glIsEnabled with argument GL_CLIP_PLANEi

SEE ALSO
       glEnable(3G)

							       GLCLIPPLANE(3G)
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