|quad||Specifies a quadrics object (created with gluNewQuadric).|
|inner||Specifies the inner radius of the partial disk (can be 0).|
|outer||Specifies the outer radius of the partial disk.|
|slices||Specifies the number of subdivisions around the z axis.|
|loops||Specifies the number of concentric rings about the origin into which the partial disk is subdivided.|
|start||Specifies the starting angle, in degrees, of the disk portion.|
|sweep||Specifies the sweep angle, in degrees, of the disk portion.|
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 +yaxis, 90 degrees along the +x axis, 180 along the -y axis, and 270 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).
gluCylinder, gluDisk, gluNewQuadric, gluQuadricOrientation, gluQuadricTexture, gluSphere