ttkExtract should provide a new mode where one can extract cells of a specified dimension

[JonasLukasczyk]

No description provided.

[JonasLukasczyk]

This thread describes a way to extract cells of a given type via the programmable filter by first storing the types as cell data, and then thresholding a specific type:

od = self.GetOutput()
od.ShallowCopy(self.GetInput())
cta = vtk.vtkIntArray()
cta.SetName("cell types")
cta.SetNumberOfComponents(1)
cta.SetNumberOfTuples(od.GetNumberOfCells())
od.GetCellData().AddArray(cta)
for x in range(0,od.GetNumberOfCells()):
cta.SetValue(x,od.GetCell(x).GetCellType())

So the question becomes if we should still add this functionality to the ttkExtract filter. What do you think @julien-tierny ?

[julien-tierny]

So the question becomes if we should still add this functionality to the ttkExtract filter.

I think so, yes. programmable filters are for advanced users. having it in ttkExtract would be very handy, for everyone. cheers, -- Dr Julien Tierny CNRS Researcher Sorbonne Universite http://lip6.fr/Julien.Tierny

…

On Wednesday, 1 July 2020 00:05:42 CEST Jonas Lukasczyk wrote: [This thread](https://vtk.org/pipermail/vtk-developers/2012-October/027819.html) describes a way to extract cells of a given type via the programmable filter by first storing the types as cell data, and then thresholding a specific type: od = self.GetOutput() od.ShallowCopy(self.GetInput()) cta = vtk.vtkIntArray() cta.SetName("cell types") cta.SetNumberOfComponents(1) cta.SetNumberOfTuples(od.GetNumberOfCells()) od.GetCellData().AddArray(cta) for x in range(0,od.GetNumberOfCells()): cta.SetValue(x,od.GetCell(x).GetCellType()) So the question becomes if we should still add this functionality to the ttkExtract filter. What do you think @julien-tierny ?