Exposing VTK filter through plugin fails

ParaView Support
1

Hi, new paraview user here. In searching for a way to uncover existing VTK filters I found this page:
https://kitware.github.io/paraview-docs/latest/cxx/PluginHowto.html

I tried following the example with multiple inputs - vtkLandmarkRegistrationFilter which is perfect because this is actually one of the filters I’d like to use. The problem is that this causes the application to crash.
Steps:

  1. copy the xml from the webpage and save as .xml
  2. Tools->Manage Pulgins-> Load New → file I just saved
  3. So far so good
  4. type lmReg = LandmarkTransformFilter() into shell , hit enter and it crashes

Help troubleshooting this is much appreciated.

2

Hmm. It looks like that class never existed (at least in the VTK repository). I wonder if it is missing some references from elsewhere. The vtkLandmarkTransform class is missing a SourceDataSet though, so it’s not quite that easy.

That said, crashing is also not good.

3

vtkLandmarkRegistrationFilter does not exist in google.

4

I should have mentioned that I changed the class as follows:
class=“vtkLandmarkTransform”

Looking at the error logs, I see:
( 50.101s) [paraview ]vtkPVAlgorithmPortsInfo:55 ERR| . vtkPVAlgorithmPortsInformation (0000023256E3C580): Could not downcast vtkAlgorithm.

5

This is not a filter (a vtkAlgorithm). You can’t use it as if it was one.

6

That would make sense. Thanks