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GLCLIPPLANE(3G)			 OpenGL Manual		       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
       frustum 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 clipping 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
       equation. When glClipPlane is called, equation is transformed by the
       inverse of the modelview matrix and stored in the resulting eye
       coordinates. 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
       coordinates and are disabled.

NOTES
       It is always the case that GL_CLIP_PLANE i = 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()

COPYRIGHT
       Copyright © 1991-2006 Silicon Graphics, Inc. This document is licensed
       under the SGI Free Software B License. For details, see
       http://oss.sgi.com/projects/FreeB/.

AUTHORS
       opengl.org

opengl.org			  03/16/2013		       GLCLIPPLANE(3G)
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