Glu.PartialDisk (gb.opengl.glu)

Static Sub PartialDisk ( Quad As GluQuadric, Inner As Float, Outer As Float, Slices As Integer, Loops As Integer, Start As Float, Sweep As Float )

draw an arc of a disk.



Specifies a quadrics object (created with Glu.NewQuadric).

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.


Glu.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 Glu.QuadricOrientation). 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 Glu.QuadricTexture), 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).

See also

Glu.QuadricOrientation, Glu.QuadricTexture,

See original documentation on OpenGL website