public void draw(float radius,
draws a sphere of the given radius centered around the origin.
The sphere is subdivided around the z axis into slices and along the z axis
into stacks (similar to lines of longitude and latitude).
If the orientation is set to GLU.OUTSIDE (with glu.quadricOrientation), then
any normals generated point away from the center of the sphere. Otherwise,
they point toward the center of the sphere.
If texturing is turned on (with glu.quadricTexture), then texture
coordinates are generated so that t ranges from 0.0 at z=-radius to 1.0 at
z=radius (t increases linearly along longitudinal lines), and s ranges from
0.0 at the +y axis, to 0.25 at the +x axis, to 0.5 at the -y axis, to 0.75
at the -x axis, and back to 1.0 at the +y axis.