gluBeginPolygon(3G) OpenGL Reference gluBeginPolygon(3G)
NAME
gluBeginPolygon, gluEndPolygon - delimit a polygon description
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 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This command is obsolete and is provided for backwards compatibility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);
Page 1
gluBeginPolygon(3G) OpenGL Reference gluBeginPolygon(3G)
SEE ALSO
gluNewTess, gluNextContour, gluTessCallback, gluTessVertex,
gluTessBeginPolygon, gluTessBeginContour
Page 2