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