GLUTESSENDPOLYGON(3G)GLUTESSENDPOLYGON(3G)NAMEgluTessEndPolygon - delimit a polygon description
C SPECIFICATION
void gluTessEndPolygon( GLUtesselator* tess )
delim $$
PARAMETERS
tess Specifies the tessellation object (created with gluNewTess).
DESCRIPTION
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.
EXAMPLE
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.
SEE ALSOgluNewTess(3G), gluTessBeginContour(3G), gluTessVertex(3G),
gluTessCallback(3G), gluTessProperty(3G), gluTessNormal(3G),
gluTessBeginPolygon(3G)
March 1, 2011
