1991-2006
Silicon Graphics, Inc.
gluDisk
3G
gluDisk
draw a disk
C Specification
void gluDisk
GLUquadric* quad
GLdouble inner
GLdouble outer
GLint slices
GLint loops
Parameters
quad
Specifies the quadrics object (created with gluNewQuadric).
inner
Specifies the inner radius of the disk (may be 0).
outer
Specifies the outer radius of the disk.
slices
Specifies the number of subdivisions around the z axis.
loops
Specifies the number of concentric rings about the origin into which
the disk is subdivided.
Description
gluDisk renders a disk on the z = 0 plane. The disk has a radius of
outer and contains a concentric circular hole with a radius
of inner. If inner is 0, then no hole is generated. The disk is
subdivided around the z axis into slices (like pizza slices) and also
about the z axis into rings
(as specified by slices and loops, respectively).
With respect to orientation, the +z side of the disk is considered to be
``outside'' (see gluQuadricOrientation).
This means that if the
orientation is set to GLU_OUTSIDE, then any normals generated
point along the +z axis. Otherwise, they point along the \-z
axis.
If texturing has been turned on (with gluQuadricTexture),
texture coordinates are generated
linearly such that where
r
=
outer
,
the value at (r, 0, 0) is
(1, 0.5), at (0, r, 0) it is (0.5, 1), at (\-r, 0, 0)
it is (0, 0.5), and
at (0, \-r, 0) it is (0.5, 0).
See Also
gluCylinder,
gluNewQuadric,
gluPartialDisk,
gluQuadricOrientation,
gluQuadricTexture,
gluSphere
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/.