GLUQUADRICORIENTATION(3G)GLUQUADRICORIENTATION(3G)NAME
gluQuadricOrientation - specify inside/outside orientation for quadrics
C SPECIFICATION
void gluQuadricOrientation( GLUquadric* quad,
GLenum orientation )
PARAMETERS
quad Specifies the quadrics object (created with gluNewQuadric).
orientation Specifies the desired orientation. Valid values are GLU_OUTSIDE and GLU_INSIDE.
DESCRIPTION
gluQuadricOrientation specifies what kind of orientation is desired for quadrics rendered with quad. The orientation values are as follows:
GLU_OUTSIDE Quadrics are drawn with normals pointing outward (the initial value).
GLU_INSIDE Quadrics are drawn with normals pointing inward.
Note that the interpretation of outward and inward depends on the quadric being drawn.
SEE ALSO gluNewQuadric(3G), gluQuadricDrawStyle(3G), gluQuadricNormals(3G), gluQuadricTexture(3G)GLUQUADRICORIENTATION(3G)
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GLUDISK(3G)GLUDISK(3G)NAME
gluDisk - draw a disk
C SPECIFICATION
void gluDisk( GLUquadric* quad,
GLdouble inner,
GLdouble outer,
GLint slices,
GLint loops )
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).
SEE ALSO
gluCylinder, gluNewQuadric, gluPartialDisk, gluQuadricOrientation, gluQuadricTexture, gluSphere
GLUDISK(3G)
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