Re: code using nurbs in ptc creo3.0

I think the VB API does not include the ability to create geometry. You need to have access to Toolkit.

If you are interested in working with NURBS then you might try Blender: http://wiki.blender.org/index.php/Doc:2.6/Manual/Modeling/Surfaces

Alternatively, as found using https://www.google.com/?gws_rd=ssl#q=programming+nurbs

OpenGL http://www.glprogramming.com/red/chapter12.html

"The NURBS Book" http://www.amazon.com/dp/3540615458/?tag=stackoverfl08-20

and many others.