vtkButterflySubdivisionFilter ?

[John Biddiscombe]

>but here is a *naive* question : what is
>vtkButterflySubdivisionFilter exactly for ? :) It performs a kind of 3D
>smoothing while adding subdivisions, but could someone give me some
>insights regarding its "concrete" applications (no pun intended of course,
>but I may have missed something) :)

Suppose you had a hollow metallic object inside an oscillating EM
field...you might want to know what currents were induced in the surface.
Two things you might want to do would be

1) Subdivide the surface into tiny patches, preferably of the same
dimensions as the wavelength of the electric/magnetic field.
2) smooth/round the sharp corners as they may cause singularities or
problems with differentials where the gradient may be infinite (eg in an
iterative solution on the first pass).

the subdivision filters are ideally suited to this sort of thing, and I'm
sure you can imagine plenty of other similar tasks to which they'd be well
suited

John B






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