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View Full Version : Can nurbs objects and curves be used as b-spline objects?



BigShooter
11-04-2003, 01:55 AM
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

mikael_aronsson
11-04-2003, 03:26 AM
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

BigShooter
11-04-2003, 09:42 AM
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