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- '\" e
- '\"! eqn | mmdoc
- '\"macro stdmacro
- .ds Vn Version 1.2
- .ds Dt 6 March 1997
- .ds Re Release 1.2.0
- .ds Dp May 02 11:53
- .ds Dm 37 begincurv
- .ds Xs 19309 4 begincurve.gl
- .TH GLUBEGINCURVE 3G
- .SH NAME
- .B "gluBeginCurve, gluEndCurve
- \- delimit a NURBS curve definition
- .SH C SPECIFICATION
- void \f3gluBeginCurve\fP(
- GLUnurbs* \fInurb\fP )
- .nf
- .fi
- void \f3gluEndCurve\fP(
- GLUnurbs* \fInurb\fP )
- .nf
- .fi
- .EQ
- delim $$
- .EN
- .SH PARAMETERS
- .TP \w'\f2nurb\fP\ \ 'u
- \f2nurb\fP
- Specifies the NURBS object (created with \%\f3gluNewNurbsRenderer\fP).
- .SH DESCRIPTION
- Use \%\f3gluBeginCurve\fP to mark the beginning of a NURBS
- curve definition.
- After
- calling \%\f3gluBeginCurve\fP, make one or more calls to
- \%\f3gluNurbsCurve\fP to define the attributes of the curve.
- Exactly one of the calls to \%\f3gluNurbsCurve\fP must have
- a curve type of \%\f3GL_MAP1_VERTEX_3\fP or \%\f3GL_MAP1_VERTEX_4\fP.
- To mark the end of the NURBS curve definition, call \%\f3gluEndCurve\fP.
- .P
- GL evaluators are used to render the NURBS curve as a series of line
- segments.
- Evaluator state is preserved during rendering
- with \f3glPushAttrib\fP(\%\f3GL_EVAL_BIT\fP) and
- \f3glPopAttrib\fP().
- See the \f3glPushAttrib\fP reference page for details on exactly what state
- these calls preserve.
- .SH EXAMPLE
- The following commands render a textured NURBS curve with normals;
- texture coordinates and normals are also specified as NURBS curves:
- .sp
- .Ex
- gluBeginCurve(nobj);
- gluNurbsCurve(nobj, ..., GL_MAP1_TEXTURE_COORD_2);
- gluNurbsCurve(nobj, ..., GL_MAP1_NORMAL);
- gluNurbsCurve(nobj, ..., GL_MAP1_VERTEX_4);
- gluEndCurve(nobj);
- .Ee
- .SH SEE ALSO
- \%\f3gluBeginSurface(3G)\fP, \%\f3gluBeginTrim(3G)\fP, \%\f3gluNewNurbsRenderer(3G)\fP,
- \%\f3gluNurbsCurve(3G)\fP,
- \f3glPopAttrib(3G)\fP, \f3glPushAttrib(3G)\fP
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