gluSphere - draw a sphere

	  void gluSphere( GLUquadric* quad,
			  GLdouble radius,
			  GLint	slices,
			  GLint	stacks )

	  quad	  Specifies the	quadrics object	(created with

	  radius  Specifies the	radius of the sphere.

	  slices  Specifies the	number of subdivisions around the z
		  axis (similar	to lines of longitude).

	  stacks  Specifies the	number of subdivisions along the z
		  axis (similar	to lines of latitude).

	  gluSphere draws a sphere of the given	radius centered	around
	  the origin. The sphere is subdivided around the z axis into
	  slices and along the z axis into stacks (similar to lines of
	  longitude and	latitude).

	  If the orientation is	set to GLU_OUTSIDE (with
	  gluQuadricOrientation), then any normals generated point
	  away from the	center of the sphere.  Otherwise, they point
	  toward the center of the sphere.

	  If texturing is turned on (with gluQuadricTexture), then
	  texture coordinates are generated so that t ranges from 0.0
	  at z=-radius to 1.0 at z=radius (t increases linearly	along
	  longitudinal lines), and s ranges from 0.0 at	the +y axis,
	  to 0.25 at the +x axis, to 0.5 at the	-y axis, to 0.75 at
	  the -x axis, and back	to 1.0 at the +y axis.

	  gluCylinder, gluDisk,	gluNewQuadric, gluPartialDisk,
	  gluQuadricOrientation, gluQuadricTexture