gluNextContour man page on RedHat
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GLUNEXTCONTOUR(3G) OpenGL Manual GLUNEXTCONTOUR(3G)
NAME
gluNextContour - mark the beginning of another contour
C SPECIFICATION
void gluNextContour(GLUtesselator* tess, GLenum type);
PARAMETERS
tess
Specifies the tessellation object (created with gluNewTess()).
type
Specifies the type of the contour being defined. Valid values are
GLU_EXTERIOR, GLU_INTERIOR, GLU_UNKNOWN, GLU_CCW, and GLU_CW.
DESCRIPTION
gluNextContour is used in describing polygons with multiple contours.
After the first contour has been described through a series of
gluTessVertex() calls, a gluNextContour call indicates that the
previous contour is complete and that the next contour is about to
begin. Another series of gluTessVertex() calls is then used to describe
the new contour. This process can be repeated until all contours have
been described.
type defines what type of contour follows. The legal contour types are
as follows:
GLU_EXTERIOR
An exterior contour defines an exterior boundary of the polygon.
GLU_INTERIOR
An interior contour defines an interior boundary of the polygon
(such as a hole).
GLU_UNKNOWN
An unknown contour is analyzed by the library to determine if it is
interior or exterior.
GLU_CCW,
GLU_CW
The first GLU_CCW or GLU_CW contour defined is considered to be
exterior. All other contours are considered to be exterior if they
are oriented in the same direction (clockwise or counterclockwise)
as the first contour, and interior if they are not.
If one contour is of type GLU_CCW or GLU_CW, then all contours must be
of the same type (if they are not, then all GLU_CCW and GLU_CW contours
will be changed to GLU_UNKNOWN).
Note that there is no real difference between the GLU_CCW and GLU_CW
contour types.
Before the first contour is described, gluNextContour can be called to
define the type of the first contour. If gluNextContour is not called
before the first contour, then the first contour is marked
GLU_EXTERIOR.
This command is obsolete and is provided for backward compatibility
only. Calls to gluNextContour are mapped to gluTessEndContour()
followed by gluTessBeginContour().
EXAMPLE
A quadrilateral with a triangular hole in it can be described as
follows:
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
gluBeginPolygon(), gluNewTess(), gluTessBeginContour(),
gluTessCallback(), gluTessVertex()
COPYRIGHT
Copyright © 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 03/16/2013 GLUNEXTCONTOUR(3G)
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