Section: Misc. Reference Manual Pages (3G)
- draw an arc of a disk
GLdouble sweep )
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.
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
is included (where 0 degrees is along the
90 degrees along the +x
axis, 180 degrees along the -y
270 degrees along the -x
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
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).