glFrontFace man page on DigitalUNIX

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glFrontFace(3G)						       glFrontFace(3G)

       glFrontFace - define front- and back-facing polygons

       void glFrontFace(
	       GLenum mode );

       Specifies  the  orientation of front-facing polygons.  GL_CW and GL_CCW
       are accepted. The initial value is GL_CCW.

       In a scene composed entirely of	opaque	closed	surfaces,  back-facing
       polygons	 are  never  visible. Eliminating these invisible polygons has
       the obvious benefit of speeding up  the	rendering  of  the  image.  To
       enable and disable elimination of back-facing polygons, call glEnable()
       and glDisable() with argument GL_CULL_FACE.

       The projection of a polygon to  window  coordinates  is	said  to  have
       clockwise  winding  if  an imaginary object following the path from its
       first vertex, its second vertex, and so on, to  its  last  vertex,  and
       finally	back to its first vertex, moves in a clockwise direction about
       the interior of the polygon.  The polygon's winding is said to be coun‐
       terclockwise if the imaginary object following the same path moves in a
       counterclockwise direction about the interior of the polygon.  glFront‐
       Face()  specifies  whether  polygons  with  clockwise winding in window
       coordinates, or counterclockwise winding	 in  window  coordinates,  are
       taken  to be front-facing. Passing GL_CCW to mode selects counterclock‐
       wise polygons as front-facing;  GL_CW  selects  clockwise  polygons  as
       front-facing.   By  default,  counterclockwise polygons are taken to be

       GL_INVALID_ENUM is generated if mode is not an accepted value.

       GL_INVALID_OPERATION is generated if glFrontFace() is executed  between
       the execution of glBegin() and the corresponding execution of glEnd().

       glGet() with argument GL_FRONT_FACE

       glCullFace(3), glLightModel(3)


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