gluBeginSurface()                               gluBeginSurface()

NAME    [Toc]    [Back]

       gluBeginSurface,  gluEndSurface  - delimit a NURBS surface
       definition

SYNOPSIS    [Toc]    [Back]

       void gluBeginSurface(
               GLUnurbs* nurb ); void gluEndSurface(
               GLUnurbs* nurb );

PARAMETERS    [Toc]    [Back]

       Specifies the NURBS object (created  with  gluNewNurbsRenderer).

DESCRIPTION    [Toc]    [Back]

       Use  gluBeginSurface()  to  mark  the beginning of a NURBS
       surface definition. After calling gluBeginSurface(),  make
       one  or  more  calls  to  gluNurbsSurface()  to define the
       attributes of the surface. Exactly one of these  calls  to
       gluNurbsSurface() must have a surface type of GL_MAP2_VERTEX_3
 or GL_MAP2_VERTEX_4. To mark the end  of  the  NURBS
       surface definition, call gluEndSurface().

       Trimming  of  NURBS  surfaces  is  supported  with  gluBeginTrim(),
  gluPwlCurve(),   gluNurbsCurve(),   and   gluEndTrim().
  See  the  gluBeginTrim()  reference  page  for
       details.

       GL evaluators are used to render the NURBS  surface  as  a
       set of polygons.  Evaluator state is preserved during rendering
  with  glPushAttrib()(GL_EVAL_BIT)   and   glPopAttrib()().
   See  the  glPushAttrib()  reference  page  for
       details on exactly what state these calls preserve.

EXAMPLE    [Toc]    [Back]

       The following commands render  a  textured  NURBS  surface
       with normals; the texture coordinates and normals are also
       described as NURBS surfaces: gluBeginSurface(nobj);
           gluNurbsSurface(nobj, ..., GL_MAP2_TEXTURE_COORD_2);
           gluNurbsSurface(nobj, ..., GL_MAP2_NORMAL);
           gluNurbsSurface(nobj, ..., GL_MAP2_VERTEX_4);  gluEndSurface(nobj);

SEE ALSO    [Toc]    [Back]

       gluBeginCurve(3), gluBeginTrim(3), gluNewNurbsRenderer(3),
       gluNurbsCurve(3), gluNurbsSurface(3), gluPwlCurve(3)



                                                gluBeginSurface()