[vtk-developers] vtkContourFilter with vtkUnstructuredGrid

[David Cole]

The vtkContourFilter requires point data as input rather than cell data. You
can run the grid through a vtkCellDataToPointData filter before using the
vtkContourFilter if you have point data attached to your grid.

HTH,
David

On Wed, Oct 29, 2008 at 5:14 PM, Okoba Salada <c674332 at web.de> wrote:

> Hello,
>
> I have got a file containing a vtkUnstructuredGrid with many cubes and want
> to put a surface over all of them, making them seem to create one large
> object.
> I found vtkContourFilter and vtkMarchingCubes seeming perfectly suitable
> for this matter. But I did not manage to apply either so far.
> Since both seem to be fine let me stick to vtkContourFilter. Whenever I use
> it on my unstructured grid the output was empty. I'm not really sure how to
> chose the isovalue, why is there only one value for three dimensions? Still
> I believe this is not the only obstacle, since I tried many isovalues. Does
> it work with unstructured grids or do I have to convert it to poly or image
> data? It made no difference when I converted it to poly data using the
> vtkDataSetSurfaceFilter.
>
> Would be thankful for any advice.
>
> Okoba
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