gluPartialDisk

gluPartialDisk renders a partial disk on the $\mathit{z}=0$ 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 $\mathit{r}=\mathit{outer}$ , 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).

gluCylinder , gluDisk , gluNewQuadric , gluQuadricOrientation , gluQuadricTexture , gluSphere

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/ .