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GLUTESSNORMAL(3G)		 OpenGL Manual		     GLUTESSNORMAL(3G)

NAME
       gluTessNormal - specify a normal for a polygon

C SPECIFICATION
       void gluTessNormal(GLUtesselator* tess, GLdouble valueX,
			  GLdouble valueY, GLdouble valueZ);

PARAMETERS
       tess
	   Specifies the tessellation object (created with gluNewTess()).

       valueX
	   Specifies the first component of the normal.

       valueY
	   Specifies the second component of the normal.

       valueZ
	   Specifies the third component of the normal.

DESCRIPTION
       gluTessNormal describes a normal for a polygon that the program is
       defining. All input data will be projected onto a plane perpendicular
       to one of the three coordinate axes before tessellation and all output
       triangles will be oriented CCW with respect to the normal (CW
       orientation can be obtained by reversing the sign of the supplied
       normal). For example, if you know that all polygons lie in the x-y
       plane, call gluTessNormal(tess, 0.0, 0.0, 1.0) before rendering any
       polygons.

       If the supplied normal is (0.0, 0.0, 0.0) (the initial value), the
       normal is determined as follows. The direction of the normal, up to its
       sign, is found by fitting a plane to the vertices, without regard to
       how the vertices are connected. It is expected that the input data lies
       approximately in the plane; otherwise, projection perpendicular to one
       of the three coordinate axes may substantially change the geometry. The
       sign of the normal is chosen so that the sum of the signed areas of all
       input contours is nonnegative (where a CCW contour has positive area).

       The supplied normal persists until it is changed by another call to
       gluTessNormal.

SEE ALSO
       gluTessBeginPolygon(), gluTessEndPolygon()

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		     GLUTESSNORMAL(3G)

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