[Bf-committers] Subsurf modeling in CAD

Ton Roosendaal ton at blender.org
Tue Nov 11 11:24:34 CET 2008

Hi devs,

Below is a text I got from Claas Kuhnen, teacher Industrial Design in 
Michigan. I knew subsurf modeling would be discovered once as superior 
to Nurbs! :)

What we probably need is to get good conversion code for Subsurf -> 
Nurbs and back. Anyone?


I recently saw that Catia from Dassault system incoporated Subdivision 
Surfaces into their workflow. It is fully treated as a parametric 
system, so NURBS surfaces are created on the fly based on the polygon 
mesh and the result can be trimed and further worked on.
Some years ago AmapiPro 7.5 had NURBS subsurface smoothing included 
of only Catmull Clark.

Here are some Catia movies showing you the integration.


I thought you might know that this type of modeling is now finally 
becoming the hot topic at Industrial Design. Catia is around 30.000 
dollars and I assume that they have serious reasons for including it.



Ton Roosendaal  Blender Foundation   ton at blender.org    www.blender.org
Blender Institute BV  Entrepotdok 57A  1018AD Amsterdam The Netherlands

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