[vtkusers] Mesh Interpolation

[Jonathan Borduas]

See the test of the vtkInterpolateDataSetAttributes:
https://www.vtk.org/gitweb?p=VTK.git;a=blob;f=Filters/Hybrid/Testing/Python/3DMorph.py

Didn’t understand why you would need to use that class though.

I think the name is misleading you. If you look at the example, this isn’t for data interpolation ! It is for the interpolation of implicit functions (as seen in the test).

More on implicit functions:  https://www.vtk.org/doc/nightly/html/classvtkImplicitFunction.html

vtkInterpolateDataSetAttributes  actually looks more like an Optimal Transport Interpolator: https://www.youtube.com/watch?v=6nhfArEM4Sg

Jonathan


From: Andrew E. Slaughter <andrew.slaughter at inl.gov>
Sent: Monday, November 26, 2018 11:43 PM
To: Jonathan Borduas <jonathan.borduas at caboma.com>; vtkusers <vtkusers at vtk.org>
Subject: Re: [vtkusers] Mesh Interpolation

I nearly have the problem figured out, but I cannot get vtkInterpolateDataSetAttributes to run. If anyone has experience with this class I would appreciate some insight into it use. I am using the object on line 114 of the attached script.

Thanks.

From: Jonathan Borduas <jonathan.borduas at caboma.com<mailto:jonathan.borduas at caboma.com>>
Date: Monday, November 26, 2018 at 11:17 AM
To: "Andrew E. Slaughter" <andrew.slaughter at inl.gov<mailto:andrew.slaughter at inl.gov>>, vtkusers <vtkusers at vtk.org<mailto:vtkusers at vtk.org>>
Subject: Re: [vtkusers] Mesh Interpolation

Hi Andrew,

One way to interpolate point and cell data between two mesh: you can use the vtkPointInterpolator with a Voronoi Kernel (or other kernel), do a itk::DiscreteGaussianImageFilter over the 3D image to smooth the interpolation and then do a vtkProbeFilter.


Best,

Jonathan

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________________________________
From: vtkusers <vtkusers-bounces at public.kitware.com<mailto:vtkusers-bounces at public.kitware.com>> on behalf of Andrew E. Slaughter via vtkusers <vtkusers at public.kitware.com<mailto:vtkusers at public.kitware.com>>
Sent: Monday, November 26, 2018 1:09:55 PM
To: vtkusers
Subject: [vtkusers] Mesh Interpolation

I need to perform interpolation of data between two ExodusII files that differ because of refinement. I was hoping someone could point me in the
correct direction for performing this action. I have attached the Exodus files that I am working with as well as a  script that reads and displays the two files.
I am using VTK7.1 (I can use 8 if needed) on MacOS.

Here is the steps that I envision, but I am open to all options:

1.      Interpolate the result from the coarse mesh to the fine mesh (I don’t know how to do this step).

2.      Use vtkInterpolateDataSetAttributes to interpolate between the result from (1) and the fine mesh.

Thanks for the help,

Andrew



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