GLUBEGINPOLYGON(3G)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.
NOTES
This command is obsolete and is provided for backward compatibility only. Calls to gluBeginPolygon are mapped to gluTessBeginPolygon fol-
lowed 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), gluTessVertex(3G), gluTessBeginPolygon(3G), gluTessBeginContour(3G)GLUBEGINPOLYGON(3G)
Check Out this Related Man Page
GLUTESSENDPOLYGON(3G)GLUTESSENDPOLYGON(3G)NAME
gluTessEndPolygon - delimit a polygon description
C SPECIFICATION
void gluTessEndPolygon( GLUtesselator* tess )
PARAMETERS
tess Specifies the tessellation object (created with gluNewTess).
DESCRIPTION
gluTessBeginPolygon and gluTessEndPolygon delimit the definition of a convex, concave or self-intersecting polygon. Within each
gluTessBeginPolygon/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.
Once gluTessEndPolygon is called, the polygon is tessellated, and the resulting triangles are described through callbacks. See
gluTessCallback for descriptions of the callback functions.
EXAMPLE
A quadrilateral with a triangular hole in it can be described like this:
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);
In the above example the pointers, v1 through v7, should point to different addresses, since the values stored at these addresses will not
be read by the tesselator until gluTessEndPolygon is called.
SEE ALSO gluNewTess(3G), gluTessBeginContour(3G), gluTessVertex(3G), gluTessCallback(3G), gluTessProperty(3G), gluTessNormal(3G),
gluTessBeginPolygon(3G)GLUTESSENDPOLYGON(3G)
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