08-10-2014
Give us the expected output files
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LEARN ABOUT CENTOS
glutessvertex
GLUTESSVERTEX(3G) OpenGL Manual GLUTESSVERTEX(3G)
NAME
gluTessVertex - specify a vertex on a polygon
C SPECIFICATION
void gluTessVertex(GLUtesselator* tess, GLdouble * location, GLvoid* data);
PARAMETERS
tess
Specifies the tessellation object (created with gluNewTess()).
location
Specifies the location of the vertex.
data
Specifies an opaque pointer passed back to the program with the vertex callback (as specified by gluTessCallback()).
DESCRIPTION
gluTessVertex describes a vertex on a polygon that the program defines. Successive gluTessVertex calls describe a closed contour. For
example, to describe a quadrilateral, gluTessVertex should be called four times. gluTessVertex can only be called between
gluTessBeginContour() and gluTessEndContour().
data normally points to a structure containing the vertex location, as well as other per-vertex attributes such as color and normal. This
pointer is passed back to the user through the GLU_TESS_VERTEX or GLU_TESS_VERTEX_DATA callback after tessellation (see the
gluTessCallback() reference page).
EXAMPLE
A quadrilateral with a triangular hole in it can be described as follows:
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);
NOTES
It is a common error to use a local variable for location or data and store values into it as part of a loop. For example:
for (i = 0; i < NVERTICES; ++i) {
GLdouble data[3];
data[0] = vertex[i][0];
data[1] = vertex[i][1];
data[2] = vertex[i][2];
gluTessVertex(tobj, data, data);
}
This doesn't work. Because the pointers specified by location and data might not be dereferenced until gluTessEndPolygon() is executed, all
the vertex coordinates but the very last set could be overwritten before tessellation begins.
Two common symptoms of this problem are when the data consists of a single point (when a local variable is used for data) and a
GLU_TESS_NEED_COMBINE_CALLBACK error (when a local variable is used for location).
SEE ALSO
gluNewTess(), gluTessBeginContour(), gluTessBeginPolygon(), gluTessCallback(), gluTessEndPolygon(), gluTessNormal(), gluTessProperty()
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 GLUTESSVERTEX(3G)