1GLUBEGINCURVE(3G)                OpenGL Manual               GLUBEGINCURVE(3G)
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NAME

6       gluBeginCurve - delimit a NURBS curve definition
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C SPECIFICATION

9       void gluBeginCurve(GLUnurbs* nurb);
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C SPECIFICATION

12       void gluEndCurve(GLUnurbs* nurb);
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PARAMETERS

15       nurb
16           Specifies the NURBS object (created with gluNewNurbsRenderer()).
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DESCRIPTION

19       Use gluBeginCurve to mark the beginning of a NURBS curve definition.
20       After calling gluBeginCurve, make one or more calls to gluNurbsCurve()
21       to define the attributes of the curve. Exactly one of the calls to
22       gluNurbsCurve() must have a curve type of GLU_MAP1_VERTEX_3 or
23       GLU_MAP1_VERTEX_4. To mark the end of the NURBS curve definition, call
24       gluEndCurve().
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26       GL evaluators are used to render the NURBS curve as a series of line
27       segments. Evaluator state is preserved during rendering with
28       glPushAttrib()(GLU_EVAL_BIT) and glPopAttrib()(). See the
29       glPushAttrib() reference page for details on exactly what state these
30       calls preserve.
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EXAMPLE

33       The following commands render a textured NURBS curve with normals;
34       texture coordinates and normals are also specified as NURBS curves:
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36           gluBeginCurve(nobj);
37              gluNurbsCurve(nobj, ..., GL_MAP1_TEXTURE_COORD_2);
38              gluNurbsCurve(nobj, ..., GL_MAP1_NORMAL);
39              gluNurbsCurve(nobj, ..., GL_MAP1_VERTEX_4);
40           gluEndCurve(nobj);
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SEE ALSO

45       gluBeginSurface(), gluBeginTrim(), gluNewNurbsRenderer(),
46       gluNurbsCurve(), glPopAttrib(), glPushAttrib()
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49       Copyright © 1991-2006 Silicon Graphics, Inc. This document is licensed
50       under the SGI Free Software B License. For details, see
51       http://oss.sgi.com/projects/FreeB/.
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AUTHORS

54       opengl.org
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58opengl.org                        06/10/2014                 GLUBEGINCURVE(3G)
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