[vtkusers] Extracting the zero levelset curve in VTK

[Arne Hansen]

ahhh okay. that sounds great.
I was hoping I could also ask if there are any linear algebra functions in
VTK, or if i have to download a seperate package such as boost to do my
matrix and vector muliplications.

In case you have not guessed already, what i want to do is to visualize a
shape model i have built. So i have a meanshape, and a set of principal
components, which i need to multiply on to its eigenvalues and add the
result to the meanshape. Then i need to extract the zerolevelset, and
visualize this isosurface in vtk.

So i think i know how to do all parts, except for the linear algebra. So do
you recommend to use a lib such as boost to do these simple matrix
operations, or is there an easier way?

Thank you


2007/1/10, Mark Gooding <mark.gooding at gmail.com>:
>
> On 10/01/07, Arne Hansen <bsd.diverse at gmail.com> wrote:
>
> > So if i am not much mistaken this cannot find zerocrossings, but only
> show
> > specified values. Correct?
>
>
> No, the contour filter finds the iso-surface, regardless of whether
> the any points exist at this value. So setting:
>
> ObjectContourFilter->SetValue(0,0)
> (first value is contour id, second value is value of isosurface)
>
> will set a contour for the zerocrossing.
>
> I use a threshold first to set the implicit function to +/- 1 and then
> find the contour, but that is partly because I am running multiple
> level-sets.
>
> Cheers,
>
> Mark
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