NAME¶

gluPartialDisk - draw an arc of a disk

C SPECIFICATION¶

void gluPartialDisk(GLUquadric* quad, GLdouble inner, GLdouble outer, GLint slices, GLint loops, GLdouble start, GLdouble sweep);

PARAMETERS¶

quad

inner

outer

slices

loops

start

sweep

DESCRIPTION¶

gluPartialDisk renders a partial disk on the z = 0 plane. A partial disk is similar to a full disk, except that only the subset of the disk from start through start + sweep is included (where 0 degrees is along the +\f2y\f axis, 90 degrees along the +x axis, 180 degrees along the \-y axis, and 270 degrees along the \-x axis).

The partial 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 partial 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 partial 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 is turned on (with gluQuadricTexture()), texture coordinates are generated linearly such that where r = outer, the value at (r, 0, 0) is (1.0, 0.5), at (0, r, 0) it is (0.5, 1.0), at (\-r, 0, 0) it is (0.0, 0.5), and at (0, \-r, 0) it is (0.5, 0.0).

SEE ALSO¶

gluCylinder(), gluDisk(), gluNewQuadric(), 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/.

AUTHORS¶

opengl.org