GLUBEGINPOLYGON(3G) UNIX Programmer's Manual GLUBEGINPOLYGON(3G)
NAME
gluBeginPolygon, gluEndPolygon - delimit a polygon descrip-
tion
C SPECIFICATION
void gluBeginPolygon( GLUtesselator* tess )
void gluEndPolygon( GLUtesselator* tess )
PARAMETERS
tess Specifies the tessellation object (created with
gluNewTess).
DESCRIPTION
gluBeginPolygon and gluEndPolygon delimit the definition of
a nonconvex polygon. To define such a polygon, first call
gluBeginPolygon. Then define the contours of the polygon by
calling gluTessVertex for each vertex and gluNextContour to
start each new contour. Finally, call gluEndPolygon to sig-
nal the end of the definition. See the gluTessVertex and
gluNextContour reference pages for more details.
Once gluEndPolygon is called, the polygon is tessellated,
and the resulting triangles are described through callbacks.
See gluTessCallback for descriptions of the callback func-
tions.
NOTES
This command is obsolete and is provided for backward compa-
tibility only. Calls to gluBeginPolygon are mapped to
gluTessBeginPolygon followed by gluTessBeginContour. Calls
to gluEndPolygon are mapped to gluTessEndContour followed by
gluTessEndPolygon.
EXAMPLE
A quadrilateral with a triangular hole in it can be
described like this:
gluBeginPolygon(tobj);
gluTessVertex(tobj, v1, v1);
gluTessVertex(tobj, v2, v2);
gluTessVertex(tobj, v3, v3);
gluTessVertex(tobj, v4, v4); gluNextContour(tobj,
GLU_INTERIOR);
gluTessVertex(tobj, v5, v5);
gluTessVertex(tobj, v6, v6);
gluTessVertex(tobj, v7, v7); gluEndPolygon(tobj);
SEE ALSO
gluNewTess(3G), gluNextContour(3G), gluTessCallback(3G),
MirBSD #10-current Printed 2021-12-07 1
GLUBEGINPOLYGON(3G) UNIX Programmer's Manual GLUBEGINPOLYGON(3G)
gluTessVertex(3G), gluTessBeginPolygon(3G),
gluTessBeginContour(3G)
MirBSD #10-current Printed 2021-12-07 2