[vtkusers] How to transform my PolyData to ImplicitFunction?

[Eric E. Monson]

No, it doesn't need Elevation, per se, it just needs _some_ scalars associated with the data for the algorithm to interpolate and correctly find inside vs outside of the cells. The Delaunay is only needed to make the cells 3D (rather than the flat 2D cells associated with something like a cube from a cube source) so that "inside" and "outside" mean something more like our intuition tells us with a cube or sphere. If you already had 3D cells and some scalars, you wouldn't need to run either of these routines before vtkImplicitDataSet.

Maybe I should add a few extra comments to the python example to make this even more explicit. ( http://www.vtk.org/Wiki/VTK/Examples/Python/vtkImplicitDataSet )

-Eric


On Apr 10, 2010, at 3:04 AM, Sebastian Gatzka wrote:

>> From http://www.vtk.org/Wiki/VTK/Examples/ImplicitDataSetClipping
> I learned that you will even have to use vtkDelaunay3D and
> vtkElevationFilter before.
> 
> I'm not sure about this anymore and will have to lookup my own code at work
> on Monday.
> 
> -----Ursprüngliche Nachricht-----
> Von: daviddoria at gmail.com [mailto:daviddoria at gmail.com] Im Auftrag von David
> Doria
> Gesendet: Samstag, 10. April 2010 00:19
> An: Jérôme
> Cc: Sebastian Gatzka; vtkusers
> Betreff: Re: [vtkusers] How to transform my PolyData to ImplicitFunction?
> 
> On Tue, Apr 6, 2010 at 4:42 AM, Jérôme <jerome.velut at gmail.com> wrote:
>> Hi,
>> 
>> Try vtkImplicitDataSet. A PolyData is a DataSet, so it should do the
> trick.
>> 
>> HTH
>> Jerome
> 
> I tried to make an example of this:
> http://www.vtk.org/Wiki/VTK/Examples/ImplicitDataSet
> 
> But it says "Can't evaluate dataset!".
> 
> Anyone know what might be wrong?
> 
> Thanks,
> 
> David
> 
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