[Paraview] Clipping volume dataset with explicit surface

[Yves Rogez]

Hi Cory,

and thank you very much, your proposition works fine for illustration 
purposes. I need better accuracy, so I will do the computation 
completely differently. In fact I can achieve what I want with a simple 
contour applied on my surface wether using the volumic data.

Anyways, below the programmable filter script (input 0 is the tetrahedra 
volume, input 1 is the cutting polydata surface):
inpMain = self.GetInputDataObject( 0, 0 )
inpCut = self.GetInputDataObject( 0, 1 )
out = self.GetOutput()

cutter = vtk.vtkCutter()
cutter.SetInputDataObject( inpMain )
cutFunction = vtk.vtkImplicitPolyDataDistance()
cutFunction.SetInput( inpCut )
cutter.SetCutFunction( cutFunction )
cutter.Update()

outData = cutter.GetOutputDataObject( 0 )
out.DeepCopy( outData )

That helped, making me think about another way ;-)

Yves

Le 14/04/2015 16:37, Cory Quammen a écrit :
> Hi Yves,
>
> Do you want to actually cut the tetrahedra that the polydata geometry 
> intersects? I don't know of anything that will do that exactly in VTK, 
> but you could approximate it by using the vtkImplicitPolyDataDistance 
> class with the vtkCutter to approximately cut the tetrahedra by the 
> polydata.
>
> If you DON'T want to cut the tetrahedra, you could write a plugin that 
> computes the distance field from each point in the tetrahedral mesh 
> using vtkImplicitPolyDataDistance, then thresholds the mesh to keep 
> only tetrahedra where at least some of the points have a negative 
> signed distance from the polydata.
>
> I hope that helps,
> Cory
>
> On Tue, Apr 14, 2015 at 4:18 AM, Yves Rogez 
> <yves.rogez at obs.ujf-grenoble.fr 
> <mailto:yves.rogez at obs.ujf-grenoble.fr>> wrote:
>
>     Hello,
>
>     I would like to know if there is a mean with paraview (or VTK, I
>     could write a plugin) to easily clip a tetrahedron based geometry
>     and data (built with a delaunay3D filter) with a polydata geometry
>     (typically a triangle mesh) ?
>     The implicit sphere-based clipping could be an approximation but
>     an explicit 3D function would be better for my application...
>
>     Thanks,
>
>     Yves
>
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> -- 
> Cory Quammen
> R&D Engineer
> Kitware, Inc.

-- 
Yves Rogez
/CONSERT Operations Engineer/

*IPAG*
/Institut de Planétologie et d'Astrophysique de Grenoble /
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