[vtkusers] Re: Compute principle curvaturs

[Goodwin Lawlor]

I've updated vtkCurvatures to calculate the principal curvatures... there
seems to be alot of undefined points (especially with a vtkSphereSouce as
the geometry). Perhaps the discrete methodology used to calculate the
Gaussian and Mean curvatures either overestimate the Gaussian or
underestimates the Mean. It seems to be dependant on the area of the
individual triangles- with larger triangles producing undefined vertices.

The updated source is here:
http://www.bioengineering-research.com/vtk/vtkCurvatures.cxx
http://www.bioengineering-research.com/vtk/vtkCurvatures.h

Goodwin



"Moti Freiman" <freiman at cs.huji.ac.il> wrote in message
news:000101c45d02$22c4d820$2a284184 at cas02...
> Hello!
> I need to compute the principle curvatures at my software.
> I saw that the vtkcurvatures class just compute the mean and Gaussian
> curvatures. When I used the formula for extracting the principle
> curvatures from mean and Gaussian,  I got undefind situation (negative
> sqrt). Do someone know how I can get the principle curvatures with vtk?
> Thank you
> Moti freiman
>
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