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/.