Re: [Freeglut-developer] The order in which we do things ...

[Nigel S. a. F. S. <ni...@ni...>]

 > I remember a message about fixing sphere and cone geometries,
> and since those are also bugs (in a loose sense--differences from GLUT) I
> think that if they are already in CVS we shouldn't take them out. 

	Spheres and cones are broken on 2.0.0 when
	back-face culling is enabled.  There are
	two main options:

	1.  Fix the current implementations.

		Sphere is easily fixed.
		(See bug 814914)
	
	2.  Roll in a large scale revamp.

		Re-implementation of solid/wire cone.
		Proposed FreeGLUT extension: cylinder
		(See file attached to RFE: 814984)

	If there is general support for (2) it would
	be straight-forward to add a sphere replacement
	following the cone and cylinder approach.

	As for the general sense of all the previous
	dialog:

  	(a) Minimal dependence on GLU is considered desirable.
	
	(b) Advantage of sin/cos tables disputed, but not
	    considered particularly harmful.

	(c) Some concern expressed about incremental stepping
	    in z and possible loss of precision.

		There is a particular effort in the revamped
		cone and cylinder than the vertecies at the
		top and bottom are _precisely_ located in
		the correct plane.  The precision of intermediate
		vertecies to form stacks is not considered
		as important.  The use of tables also ensures
		that the first and last radial position are
		precisely the same, rather than relying on
		sin(0) == sin(2*M_PI*i/slices) == 0.000000000000

	I would like to add the revamped sphere and have
	sphere, cone and cylinder land in CVS together.

Nigel