77 lines
2.1 KiB
Plaintext
77 lines
2.1 KiB
Plaintext
'\" 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 beginpoly
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.ds Xs 33625 4 beginpolygon.gl
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.TH GLUBEGINPOLYGON 3G
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.SH NAME
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.B "gluBeginPolygon, gluEndPolygon
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\- delimit a polygon description
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.SH C SPECIFICATION
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void \f3gluBeginPolygon\fP(
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GLUtesselator* \fItess\fP )
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.nf
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.fi
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void \f3gluEndPolygon\fP(
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GLUtesselator* \fItess\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'\f2tess\fP\ \ 'u
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\f2tess\fP
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Specifies the tessellation object (created with \%\f3gluNewTess\fP).
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.SH DESCRIPTION
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\%\f3gluBeginPolygon\fP and \%\f3gluEndPolygon\fP delimit the definition of a
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nonconvex polygon.
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To define such a polygon, first call \%\f3gluBeginPolygon\fP.
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Then define the contours of the polygon
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by calling
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\%\f3gluTessVertex\fP for each vertex
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and \%\f3gluNextContour\fP to start each new contour.
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Finally, call \%\f3gluEndPolygon\fP
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to signal the end of the definition.
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See the \%\f3gluTessVertex\fP and
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\%\f3gluNextContour\fP reference pages for more details.
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.P
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Once \%\f3gluEndPolygon\fP is called, the polygon is tessellated, and the
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resulting triangles are described through callbacks.
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See \%\f3gluTessCallback\fP for descriptions of the callback functions.
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.SH NOTES
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This command is obsolete and is provided for backward compatibility
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only. Calls to \%\f3gluBeginPolygon\fP are mapped to
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\%\f3gluTessBeginPolygon\fP
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followed by
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\%\f3gluTessBeginContour\fP. Calls to \%\f3gluEndPolygon\fP are mapped
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to \%\f3gluTessEndContour\fP followed by \%\f3gluTessEndPolygon\fP.
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.SH EXAMPLE
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A quadrilateral with a triangular hole in it can be described like this:
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.sp
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.Ex
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gluBeginPolygon(tobj);
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gluTessVertex(tobj, v1, v1);
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gluTessVertex(tobj, v2, v2);
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gluTessVertex(tobj, v3, v3);
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gluTessVertex(tobj, v4, v4);
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gluNextContour(tobj, GLU_INTERIOR);
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gluTessVertex(tobj, v5, v5);
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gluTessVertex(tobj, v6, v6);
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gluTessVertex(tobj, v7, v7);
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gluEndPolygon(tobj);
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.Ee
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.SH SEE ALSO
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\%\f3gluNewTess(3G)\fP, \%\f3gluNextContour(3G)\fP, \%\f3gluTessCallback(3G)\fP, \%\f3gluTessVertex(3G)\fP,
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\%\f3gluTessBeginPolygon(3G)\fP, \%\f3gluTessBeginContour(3G)\fP
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