GLUDISK

NAME

gluDisk - draw a disk

C SPECIFICATION

void gluDisk( GLUquadric* quad,


                GLdouble inner,
                GLdouble outer,
                GLint slices,
                GLint loops )

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PARAMETERS

quad: Specifies the quadrics object (created with gluNewQuadric).
inner: Specifies the inner radius of the disk (may be 0).
outer: Specifies the outer radius of the disk.
slices: Specifies the number of subdivisions around the z axis.
loops: Specifies the number of concentric rings about the origin into which the disk is subdivided.

DESCRIPTION

gluDisk renders a disk on the z = 0 plane. The 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 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 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).