gluTessBeginPolygon man page on DigitalUNIX
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gluTessBeginPolygon() gluTessBeginPolygon()
NAME
gluTessBeginPolygon - delimit a polygon description
SYNOPSIS
void gluTessBeginPolygon(
GLUtesselator* tess,
GLvoid* data );
PARAMETERS
Specifies the tessellation object (created with gluNewTess()). Speci‐
fies a pointer to user polygon data.
DESCRIPTION
gluTessBeginPolygon() and gluTessEndPolygon() delimit the definition of
a convex, concave or self-intersecting polygon. Within each gluTessBe‐
ginPolygon()/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.
data is a pointer to a user-defined data structure. If the appropriate
callback(s) are specified (see gluTessCallback()), then this pointer is
returned to the callback function(s). Thus, it is a convenient way to
store per-polygon information.
Once gluTessEndPolygon() is called, the polygon is tessellated, and the
resulting triangles are described through callbacks. See gluTessCall‐
back() for descriptions of the callback functions.
EXAMPLE
A quadrilateral with a triangular hole in it can be described as fol‐
lows: 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);
SEE ALSO
gluNewTess(3), gluTessBeginContour(3), gluTessVertex(3), gluTessCall‐
back(3), gluTessProperty(3), gluTessNormal(3), gluTessEndPolygon(3)
gluTessBeginPolygon()
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