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gluPartialDisk.3gl
Langue: en
Version: 95814 (fedora - 25/11/07)
Section: 3 (Bibliothèques de fonctions)
NAME
gluPartialDisk - draw an arc of a diskC SPECIFICATION
void gluPartialDisk( GLUquadric* quad,GLdouble inner, GLdouble outer, GLint slices, GLint loops, GLdouble start, GLdouble sweep )
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PARAMETERS
- quad
- Specifies a quadrics object (created with gluNewQuadric).
- inner
- Specifies the inner radius of the partial disk (can be 0).
- outer
- Specifies the outer radius of the partial disk.
- slices
- Specifies the number of subdivisions around the z axis.
- loops
- Specifies the number of concentric rings about the origin into which the partial disk is subdivided.
- start
- Specifies the starting angle, in degrees, of the disk portion.
- sweep
- Specifies the sweep angle, in degrees, of the disk portion.
DESCRIPTION
gluPartialDisk 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 +yaxis, 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 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 is turned on (with gluQuadricTexture), 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
gluCylinder(3G), gluDisk(3G), gluNewQuadric(3G), gluQuadricOrientation(3G), gluQuadricTexture(3G), gluSphere(3G)Contenus ©2006-2024 Benjamin Poulain
Design ©2006-2024 Maxime Vantorre