[vtkusers] question about vtkQuadric, SamleFunction and ContourFilter

[Frederic Simons]

anyone?

Frederic Simons <Simons <at> inbk.rwth-aachen.de> writes:

> 
> 
> Hello everyone,
>  
> I’ve got a problem trying to create a Polygon using a vtkImlicitFunction
(vtkQuadric) , a sampler and the vtkContourfilter. The Code  is:
>  
> > vtkSmartPointer<vtkQuadric>  quadric =
> >                             vtkSmartPointer<vtkQuadric> ::New();
>
> (...)
>
> With the parameters in the examples
(http://www.vtk.org/Wiki/VTK/Examples/Cxx/Visualization/QuadraticSurface) it
just works. Using my own parameters (here for testing purposes --- body should
be an elliptical cylinder) it fails. Also the Output of the sampler is empty
(printed the vtkImageData to a .vti file ) .. 
>  
> Later on this code must work with any given parameters (any reasonable, the
resulting surface will be used in conjunction with
vtkBooleanOperationPolyData-thingie to construct complex object).
>  
> My Question:
> Are there *ANY* constrains with the
vtkQuadric/vtkSampleFunction/vtkContourFilter that I’m not aware of. In the doc
I haven’t  found anything regarding degenerate quadratic surfaces. 
> Please enlighten me. 
>  
> Kind regards & thanks in advance
> Frederic Simons
> 
> 
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