[Fluxus] nurbs problems

[gabor papp]

> This is partially to do with the fact that you need to add extra control
> vertices to maintain continuity across the surface of the sphere, this
> could be hidden from the pdata interface, but I think it's better not to.
this behaviour was not clear for me from the documentation. i think the 
nurbs topology section suggests that a 5x5 sphere has 25 points, which 
are coincident at the edges.

> MakeNURBSSphere() and MakeNURBSPlane(). The offsets in the for loops
> generating the knot vectors look a bit strange to me.
thanks. i look into this then.

gabor