Making undeformable circles?
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 From:  Karsten (KMRQUS) 24 Jul 2016  (9 of 11) 
8038.9 In reply to 8038.1 
Hello 3image,

at the end every circle is represented as a nurb curve in modern CAD. The number of control points isn't a criteria to decide if it is exact or not. The magic here is the knot vector. You can find a very good desciption for that on page 9 in the following document: http://digiitalarchfab.com/portal/wp-content/uploads/2011/03/Nurbs-Curve-A-Guide-for-the-Uninitiated.pdf

Have a nice day
Karsten
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 From:  Frenchy Pilou (PILOU) 25 Jul 2016  (10 of 11) 
8038.10 
Enlighting!
---
Pilou
Is beautiful that please without concept!
My Gallery
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 From:  bemfarmer 25 Jul 2016  (11 of 11) 
8038.11 In reply to 8038.9 
A more legible copy of the article is here:

http://www.hcs.harvard.edu/~lynders/cs275/NURBCurvesForUninitiated.ps

- Brian
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