# gluDisk.3G - Man Page

draw a disk

## C Specification

```	GLdouble inner,
GLdouble outer,
GLint slices,
GLint loops )```

## Parameters

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 $r\text{ }=\text{ }\text{outer}$, 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).