I am having trouble evaluating periodic nurbs curves and surfaces. I would like to simply convert the NURBS data to non-periodic by (maybe) duplicating the end knots and CVs to get a non-periodic surface.
Lets say I have a surface that is periodic in the U direction, but not V.
The U knot vector looks like this [2, 3, 4, 5]
multiplicites are [1,1,1,1]
and we have 4 CVs.
The data comes from Rhino. Others tools don’t seen to generate periodic surfaces.
How do I convert this to non-periodic? It seems simple enough, but my results are wildly incorrect. Does anyone have a simple solution?