[Paraview] [EXT] Re: vtkPointDataToCellData but only for selected PointData

Mon Apr 30 15:49:51 EDT 2018

This does what you are looking for:

import vtk

# copy entire structure across

self.GetOutputDataObject(0).ShallowCopy(self.GetInputDataObject(0,0))

# use pass arrays to extract a copy with one array of interest

myArrays=vtk.vtkPassArrays()

myArrays.SetInputDataObject(self.GetInputDataObject(0,0))

myArrays.ClearArrays()

myArrays.AddPointDataArray('DISPL')

myArrays.AddCellDataArray('')

myArrays.AddFieldDataArray('')

# use point2cell to operate on the one array we care about

p2c = vtk.vtkPointDataToCellData()

p2c.SetInputConnection(myArrays.GetOutputPort())

p2c.Update()

# iterate over blocks and copy in the result

iter=dsa.MultiCompositeDataIterator([p2c.GetOutputDataObject(0), output])

for  in_block,  output_block in iter:

     output_block.GetCellData().AddArray(in_block.VTKObject.GetCellData().GetArray('DISPL'))

David E DeMarle
Kitware, Inc.
Principal Engineer
21 Corporate Drive
Clifton Park, NY 12065-8662
Phone: 518-881-4909

On Mon, Apr 30, 2018 at 8:52 AM, Dennis Conklin <dennis_conklin at goodyear.com
> wrote:

> David,
>
>
>
> I have not called filters within the Programmable Filter before and I am
> not getting things hooked up correctly.     My attempt is attached.
> Clearly, I do not understand how to hook the output of 1 filter to the
> input of the next because I’m getting to the end and getting something with
> no blocks and no cells.
>
>
>
> Any hints?
>
>
>
> Dennis
>
>
>
>
>
>
>
>
>
>
>
> *From:* David E DeMarle [mailto:dave.demarle at kitware.com]
> *Sent:* Tuesday, April 10, 2018 10:14 AM
> *To:* Dennis Conklin <dennis_conklin at goodyear.com>
> *Cc:* Paraview (paraview at paraview.org) <paraview at paraview.org>
> *Subject:* [EXT] Re: [Paraview] vtkPointDataToCellData but only for
> selected PointData
>
>
>
>  *WARNING - External email; exercise caution.*
>
>
>
> The pass arrays filter comes to mind.
>
>
>
> If creating withing your python programmable filter it will be called
> vtk.vtkPassArrays then follow that with a vtk.vtkPointDataToCellData.
>
>
>
>
>
>
> David E DeMarle
> Kitware, Inc.
> Principal Engineer
> 21 Corporate Drive
> Clifton Park, NY 12065-8662
> Phone: 518-881-4909
>
>
>
> On Tue, Apr 10, 2018 at 10:07 AM, Dennis Conklin <
> dennis_conklin at goodyear.com> wrote:
>
> All,
>
>
>
> Well, this list solved my problem so easily (and made me feel slightly
> less than the sharpest pencil in the box) yesterday, so I thought I’d try
> again.
>
>
>
> I am doing some Python calcs inside a programmable filter and some of the
> results I want to average from the Points onto the Cells.   But,  I don’t
> want all my PointData moved over to CellData – I want to transfer some of
> them over within my Filter.
>
>
>
> Right now I’m looping thru all the elements and finding all their nodes,
> then averaging them and assigning to the cells.  It is dog slow and is
> choking off the usefulness of this filter.
>
>
>
> Is there anything like vtkPointDataToCellData that lets me specify which
> quantities to convert – could I do something tricky like store original
> list of PointData, make up a new list, then run PointDataToCellData, then
> restore the list of PointData ??
>
>
>
> I realize this may have all sorts of unexpected side effects, so I’m just
> asking!
>
>
>
> Thanks again, this group is great!
>
>
>
> Dennis
>
>
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