Hi all,
I'm very new to NURBS and IGA, and I'm facing to very simple problems...
While understanding the NURBS structure, I found problems on weights. In
particular, for a quarter of circular surface, using degree of 2 along
the circular coordinate, and 1 along the radial coordinate (like
explained in prof. Hughes' IGA book, chapter 2, "bent pipe"), I could
place three control points for the external edge ( [1 0 0] [1 1 0] [0
1 0] ) and the other three coincident at [0 0 0].
Well, in order of having a circle, the weight of control point [1 1 0]
should be 1/sqrt(2), but instead of "bending" the edge towards the
center, is "bent" towards the outside...
Am I doing something wrong?
I had the same problem while defining the hole "bent pipe" example on
prof. Hughes' book, and all the edges were bent towards outside.
Thank you very much for your help.
Regards,
Marco

Marco Brino
Politecnico di Torino  DIGEP
Corso Duca degli Abruzzi, 24
I10129 Torino, Italy
+39 011 090 7205
+39 393 554 4537
marco.brino@...
