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Table of Contents
gluTessEndPolygon - delimit a polygon description
void
gluTessEndPolygon( GLUtesselator* tess )
eqn not supported
- tess
- Specifies the tessellation object (created
with gluNewTess).
gluTessBeginPolygon and gluTessEndPolygon delimit
the definition of a convex, concave or self-intersecting polygon. Within
each gluTessBeginPolygon/gluTessEndPolygon pair, there must be one or more
calls to gluTessBeginContour/gluTessEndContour. Within each contour, there
are zero or more calls to gluTessVertex. The vertices specify a closed
contour (the last vertex of each contour is automatically linked to the
first). See the gluTessVertex, gluTessBeginContour and gluTessEndContour
reference pages for more details.
Once gluTessEndPolygon is called, the
polygon is tessellated, and the resulting triangles are described through
callbacks. See gluTessCallback for descriptions of the callback functions.
A quadrilateral with a triangular hole in it can be described like
this:
gluTessBeginPolygon(tobj, NULL); gluTessBeginContour(tobj);
gluTessVertex(tobj, v1, v1);
gluTessVertex(tobj, v2, v2);
gluTessVertex(tobj, v3, v3);
gluTessVertex(tobj, v4, v4);
gluTessEndContour(tobj);
gluTessBeginContour(tobj);
gluTessVertex(tobj, v5, v5);
gluTessVertex(tobj, v6, v6);
gluTessVertex(tobj, v7, v7);
gluTessEndContour(tobj);
gluTessEndPolygon(tobj); In the above example the pointers, $v1$ through
$v7$, should point to different addresses, since the values stored at
these addresses will not be read by the tesselator until gluTessEndPolygon
is called.
gluNewTess(3G)
, gluTessBeginContour(3G)
, gluTessVertex(3G)
,
gluTessCallback(3G)
, gluTessProperty(3G)
, gluTessNormal(3G)
, gluTessBeginPolygon(3G)
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