Got a problem with periodic nurbs, e.g. a cylinder. I get the definition of the nurbs face of a cylinder. Then I get two trimming loops, which define the upper and lower border of the cylinder in (u,v)-space. Problem is, that opengl displays nothing when I try to apply this. Documentation tells me, that a trimming loop has to be closed. But thats not possible with a periodic face. When you unroll the cylinder face to a flat surface, then the two trimming loops will appear as lines in (u,v)-space. I tried to close them by giving opengl the coordinates of the first point as the last point -> didn’t work.
The cylinder is just an example. I could get any periodic surface.
[This message has been edited by Kilam Malik (edited 08-07-2000).]