[vtkusers] Problems using implicitfunctions

[David Doria]

On Thu, Sep 30, 2010 at 9:13 AM, Laurent <l.paul at uclouvain.be> wrote:

>
> This is an update of my findings...
>
> It appears that the clipping is well performed on my polydata.
> Unfortunately, the SuperQuadricSource that I see is not exactly the same as
> the SuperquadricImplicitFunction. The difference is resolution dependant, I
> mean that if I lower the resolution of the SuperQuadricSource, its topology
> changes and so, I don't get the same difference.
>
> Thus, Which one is wrong?
> Any of them. I have to consider the Source and the ImplicitFunction as two
> different objects, and cannot use both of them for display AND for
> clipping.
>
> I am surprised of not finding a class that computes the intersection
> between
> two PolyDatas. I'll try to write one.
>
> If someone knows a vtk class that is able to do a similar job, thanks to
> communicate it!
>
> Laurent.
>
>
Laurent,

Bryn has written such a class:
http://www.midasjournal.org/browse/publication/726

It relies on GTS, but it works very well.

There is also http://sourceforge.net/projects/vtkbioeng/ which has a
collisionDetection filter that may be worth looking at.

David
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