quad:PartialDisk -- draw an arc of a disk
quad:PartialDisk(inner, outer, slices, loops, start, sweep)
quad:PartialDisk() 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 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 quad:Orientation for details.). 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 quad:Texture()), 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).

Please consult an OpenGL reference manual for more information.

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

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