GLUDISK(3G) | GLUDISK(3G) |
With respect to orientation, the +z side of the 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 axis.
If texturing has been turned on (with gluQuadricTexture), texture coordinates are generated linearly such that where $ r ~=~ "outer" $, the value at ( r, 0, 0) is (1, 0.5), at (0, r, 0) it is (0.5, 1), at (-r, 0, 0) it is (0, 0.5), and at (0, - r, 0) it is (0.5, 0).