GLUNEWTESS(3G) OpenGL Manual GLUNEWTESS(3G)NAME
gluNewTess - create a tessellation object
C SPECIFICATION
GLUtesselator* gluNewTess(
DESCRIPTION
gluNewTess creates and returns a pointer to a new tessellation object. This object must be referred to when calling tessellation functions.
A return value of 0 means that there is not enough memory to allocate the object.
SEE ALSO
gluTessBeginPolygon(), gluDeleteTess(), gluTessCallback()
COPYRIGHT
Copyright (C) 1991-2006 Silicon Graphics, Inc. This document is licensed under the SGI Free Software B License. For details, see
http://oss.sgi.com/projects/FreeB/.
AUTHORS
opengl.org
opengl.org 06/10/2014 GLUNEWTESS(3G)
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GLUTESSENDPOLYGON(3G) OpenGL Manual 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(), gluTessBeginContour(), gluTessBeginPolygon(), gluTessCallback(), gluTessNormal(), gluTessProperty(), gluTessVertex()
COPYRIGHT
Copyright (C) 1991-2006 Silicon Graphics, Inc. This document is licensed under the SGI Free Software B License. For details, see
http://oss.sgi.com/projects/FreeB/.
AUTHORS
opengl.org
opengl.org 06/10/2014 GLUTESSENDPOLYGON(3G)
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