2. EL 6 ELS
  3. mesa-libGLU-devel
  4. gluBeginCurve(3gl)

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GLUBEGINCURVE(3G) GLUBEGINCURVE(3G)

NAME

gluBeginCurve, gluEndCurve - delimit a NURBS curve definition

C SPECIFICATION

void gluBeginCurve( GLUnurbs* nurb )



void gluEndCurve( GLUnurbs* nurb )










PARAMETERS



  

  
Specifies the NURBS object (created with gluNewNurbsRenderer).








DESCRIPTION


Use gluBeginCurve to mark the beginning of a NURBS curve
    definition. After calling gluBeginCurve, make one or more calls to
    gluNurbsCurve to define the attributes of the curve. Exactly one of
    the calls to gluNurbsCurve must have a curve type of
    GL_MAP1_VERTEX_3 or GL_MAP1_VERTEX_4. To mark the end of the
    NURBS curve definition, call gluEndCurve.


GL evaluators are used to render the NURBS curve as a series of
    line segments. 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


The following commands render a textured NURBS curve with normals;
    texture coordinates and normals are also specified as NURBS curves:


gluBeginCurve(nobj);
  

   gluNurbsCurve(nobj, ..., GL_MAP1_TEXTURE_COORD_2);
  

   gluNurbsCurve(nobj, ..., GL_MAP1_NORMAL);
  

   gluNurbsCurve(nobj, ..., GL_MAP1_VERTEX_4); gluEndCurve(nobj);






SEE ALSO


gluBeginSurface(3G), gluBeginTrim(3G),
    gluNewNurbsRenderer(3G), gluNurbsCurve(3G),
    glPopAttrib(3G), glPushAttrib(3G)