fgluBeginCurve(3G) OpenGL Reference fgluBeginCurve(3G)NAME
fgluBeginCurve, fgluEndCurve - delimit a NURBS curve definition
FORTRAN SPECIFICATION
SUBROUTINE fgluBeginCurve( CHARACTER*8 nurb )
SUBROUTINE fgluEndCurve( CHARACTER*8 nurb )
PARAMETERS
nurb Specifies the NURBS object (created with fgluNewNurbsRenderer).
DESCRIPTION
Use fgluBeginCurve to mark the beginning of a NURBS curve definition.
After calling fgluBeginCurve, make one or more calls to fgluNurbsCurve to
define the attributes of the curve. Exactly one of the calls to
fgluNurbsCurve 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
fgluEndCurve.
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
fgluBeginSurface, fgluBeginTrim, fgluNewNurbsRenderer, fgluNurbsCurve,
glPopAttrib, glPushAttrib
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