I don’t think I made myself clear in the last post. Basically, I wonder how to use the ogl nurbs evaluators and functions to simulate b-spline surfaces. Is this possible? It should be as nurbs are also b-splines…

Thank you,

Luke

A b-spline surface if just a limited version of a nurbs surface, a nurbs surface or curve is a b-spline surface or curve with rational values added to the contol points (the w values), for a b-spline the rational value is always assumed to be 1 and a b-splines always has a uniform knot vector, a nurbs knot vector does not have to be uniform.

Mikael

Michael, so it is possible to draw b-spline curves and surfaces with ogl nurbs, right?

The question still stays: how?

I.e. how would I setup the parameters? Woudl I do anything special to call the nurbs functions?

Thank you,

Luke