OpenGL C bindings library: libGL.a
void gluDisk(GLquadric* quad, GLdouble inner, GLdouble outer, GLint slices, GLint loops)
The gluDisk subroutine renders a disk on the z=0 plane. The disk has a radius defined by the outer parameter and contains a concentric circular hole with a radius defined by the inner parameter. If the value of inner is 0, no hole is generated. The disk is subdivided around the z axis into slices and rings (as specified by the slices and loops parameters, respectively).
With regard to orientation, the +z side of the disk is considered to be outside. (See the gluQuadricOrientation subroutine for details on specifying quadrics orientation.) If orientation is set to GLU_OUTSIDE, any normals generated point along the +z axis. Otherwise, they point along the -z axis.
If texturing is turned on with the gluQuadricTexture subroutine, texture coordinates are generated linearly, consistent with the following table:
| XYZ Coordinates | (u, v) Texture Coordinates |
|---|---|
| (outer, 0.0, 0.0) | (1.0, 0.5) |
| (0.0, outer, 0.0) | (0.5, 1.0) |
| (-outer, 0.0, 0.0) | (0.5, 0.0) |
The formulae are:
texture coordinate u = 0.5 + 0.5 * (x/outer)
texture coordinate v = 0.5 + 0.5 * (y/outer)
| /usr/include/GL/gl.h | Contains C language constraints, variable type definitions, and ANSI function prototypes for OpenGL. |
The gluCylinder subroutine, gluNewQuadric subroutine, gluPartialDisk subroutine, gluQuadricOrientation subroutine, gluQuadricTexture subroutine, gluSphere subroutine.