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gluDisk

Chapter 4

112

gluDisk

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).

HP b2600 Reference Guide

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