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Name

gluBeginPolygon, gluEndPolygon - delimit a polygon description

C Specification

void gluBeginPolygon( GLUtesselator* tess ) 

 void gluEndPolygon( GLUtesselator* tess ) 



 eqn not supported


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 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. 

Notes

This command is obsolete and is provided for backward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. 

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, gluNextContour, gluTessCallback,
gluTessVertex, gluTessBeginPolygon, gluTessBeginContour 

 

 

 




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