-  specify  whether  front-  or  back-facing facets can be
       culled



C SPECIFICATION


PARAMETERS

       _param1  Specifies whether front-  or  back-facing  facets
                are  candidates  for culling.  Symbolic constants
                GL_FRONT,  GL_BACK,  and  GL_FRONT_AND_BACK   are
                accepted.  The initial value is GL_BACK.


DESCRIPTION

       glCullFace  specifies whether front- or back-facing facets
       are culled (as specified by mode) when  facet  culling  is
       enabled.  Facet  culling is initially disabled.  To enable
       and disable facet culling, call the glEnable and glDisable
       commands  with  the argument GL_CULL_FACE.  Facets include
       triangles, quadrilaterals, polygons, and rectangles.

       glFrontFace specifies which of the clockwise and  counter-
       clockwise  facets  are  front-facing and back-facing.  See
       glFrontFace.


NOTES

       If  _param1 is GL_FRONT_AND_BACK, no facets are drawn, but
       other primitives such as points and lines are drawn.


ERRORS

       GL_INVALID_ENUM is generated if _param1 is not an accepted
       value.

       GL_INVALID_OPERATION is generated if  glCullFace  is  exe-
       cuted between the execution of glBegin and the correspond-
       ing execution of glEnd.


ASSOCIATED GETS

       glIsEnabled with argument GL_CULL_FACE
       glGet with argument GL_CULL_FACE_MODE


SEE ALSO

       glEnable, glFrontFace



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