modo 3dm
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 From:  Frenchy Pilou (PILOU)
1258.12 In reply to 1258.11 
You right soon posted some posts previous ;)
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Pilou
Is beautiful that please without concept!
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 From:  tyglik
1258.13 In reply to 1258.9 
Hi Boatstalker,

>>Basically T-Splines is a specific expression or subset of Catmull-Clark subdivision surfaces
>>but what makes it so beautiful is that it is also a subset of NURBS


quote:

T-Splines are truly a proper superset of NURBS [...]. Given two sets A and B, A is said to be a proper superset of B if every element of B is contained in A, and there exists at least one element in A that is not in B. By this basic definition, it is clear that the set of all T-Splines is a proper superset of the set of all NURBS, because every NURBS is a special case of a T-Spline, but not all T-Splines are NURBS. [Tom Sederberg, T-Splines, Inc.]

Petr
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 From:  jbshorty
1258.14 In reply to 1258.13 
That's correct. The T-splines people say that it's able to duplicate any nurbs surface exactly, and any catmull-clark surface exactly. This of course must be under the right conditions, and with enough CPU power to handle complex objects. A t-spline is probably carrying more overhead than either Nurbs or Subd...

jonah
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 From:  boatstalker
1258.15 In reply to 1258.13 
Hi Tyglik,

Thanks for correcting my errors. Guess I need to do my homework more properly ;-)

Anyway, for those interested in the topic of the convergence of NURBS and SDS the article on extended subdivision surfaces is higly recommended. It seems like ESUBS offer even more possibilities than T-NURCC surfaces (t-splines).
Here is the link:

http://portal.acm.org/citation.cfm?id=1138455

Happy modeling!!!
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