gluPartialDisk: draw an arc of a disk.
C Specification |
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 +Y
axis, 90 degrees along the +X axis, 180 along the Y axis, and 270 along the X axis).
- Specifies a quadrics object (created with gluNewQuadric).
- Specifies the inner radius of the partial disk (can be 0).
- Specifies the outer radius of the partial disk.
- Specifies the number of subdivisions around the Z axis.
- Specifies the number of concentric rings about the origin into which the
partial disk is subdivided.
- Specifies the starting angle, in degrees, of the disk portion.
- Specifies the sweep angle, in degrees, of the disk portion.
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
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
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).