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gluBeginPolygon, gluEndPolygon - delimit a polygon description
void gluBeginPolygon( GLUtesselator* tess )
void gluEndPolygon( GLUtesselator* tess )
eqn not supported
- tess
- Specifies the tessellation object (created
with gluNewTess).
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 signal 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 functions.
This command is obsolete and is provided for backward
compatibility only. Calls to gluBeginPolygon are mapped to gluTessBeginPolygon
followed by gluTessBeginContour. Calls to gluEndPolygon are mapped to gluTessEndContour
followed by gluTessEndPolygon.
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);
gluNewTess(3G)
, gluNextContour(3G)
, gluTessCallback(3G)
,
gluTessVertex(3G)
, gluTessBeginPolygon(3G)
, gluTessBeginContour(3G)
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