71 lines
2.0 KiB
Plaintext
71 lines
2.0 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 beginsurf
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.ds Xs 47264 4 beginsurface.gl
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.TH GLUBEGINSURFACE 3G
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.SH NAME
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.B "gluBeginSurface, gluEndSurface
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\- delimit a NURBS surface definition
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.SH C SPECIFICATION
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void \f3gluBeginSurface\fP(
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GLUnurbs* \fInurb\fP )
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.nf
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.fi
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void \f3gluEndSurface\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 \%\f3gluBeginSurface\fP to mark the beginning of a NURBS
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surface definition. After
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calling \%\f3gluBeginSurface\fP, make one or more calls to
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\%\f3gluNurbsSurface\fP to define the attributes of the surface.
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Exactly one of these calls to \%\f3gluNurbsSurface\fP must have a
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surface type of \%\f3GL_MAP2_VERTEX_3\fP or \%\f3GL_MAP2_VERTEX_4\fP.
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To mark the end of the NURBS surface definition, call
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\%\f3gluEndSurface\fP.
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.P
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Trimming of NURBS surfaces is supported with \%\f3gluBeginTrim\fP,
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\%\f3gluPwlCurve\fP, \%\f3gluNurbsCurve\fP, and \%\f3gluEndTrim\fP. See the
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\%\f3gluBeginTrim\fP reference page for details.
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.P
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GL evaluators are used to render the NURBS surface as a set of polygons.
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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 surface with normals;
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the texture coordinates and normals are also described as NURBS surfaces:
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.sp
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.Ex
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gluBeginSurface(nobj);
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gluNurbsSurface(nobj, ..., GL_MAP2_TEXTURE_COORD_2);
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gluNurbsSurface(nobj, ..., GL_MAP2_NORMAL);
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gluNurbsSurface(nobj, ..., GL_MAP2_VERTEX_4);
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gluEndSurface(nobj);
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.Ee
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.sp
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.SH SEE ALSO
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\%\f3gluBeginCurve(3G)\fP, \%\f3gluBeginTrim(3G)\fP, \%\f3gluNewNurbsRenderer(3G)\fP,
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\%\f3gluNurbsCurve(3G)\fP, \%\f3gluNurbsSurface(3G)\fP, \%\f3gluPwlCurve(3G)\fP
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