[Paraview] passing a numpy array to a programmable filter

[Utkarsh Ayachit]

The best option would be to indeed move the Python code to "get" the array
from the the other numerical process to the Programmable Filter's script
itself, rather than doing it in the batch script.

The do-at-your-own-peril option, which may work if you don't intend to run
the batch script in parallel or client-server modes,  would be to pass the
array via a global variable in some module that both the batch script and
the programmable filter script import. Since the Python interpreter is
shared between the two, and modules don't get imported twice, you should be
able to set the variable in one and access it in another.

Utkarsh

On Fri, May 26, 2017 at 10:53 AM, Alessandro De Maio <demaio.a at gmail.com>
wrote:

> Dear all,
>      I'm writing a pvbatch script in which I need to perform some
> calculations on paraview objects (provided by a quite complex pipeline that
> starts from reading vtu files and processing through reseamplewithdataset
> filter and other filter manipulations) by using a programmable filter to
> which I must pass some information that in the main script is representable
> as a quite big float numpy ndarray. This array comes from another numerical
> process that cannot be included in the same programmable filter.
>
> I don't know how to pass this numpy array to the programmable filter.
> Probably I could use the Parameters property of the programmable filter
> but, if I correctly understand the use of this feature, the whole array
> should be converted to a very big string (or more than one) and then
> reconverted back to float values inside the PF.
>
> I've tried to create a vtkTable object in the main script using the
> following lines:
>
> T = vtkTable()
> array_vtk = numpy_support.numpy_to_vtk(array)
> array_vtk.SetName("AAA")
> T.AddColumn(array_vtk)
>
> and this seems to generate a vtkTable object (by printing type(T) I get
> "<type 'vtkCommonDataModelPython.vtkTable'> " ) but this is not a
> Paraview class object so when I pass this as an input argument to the
> Programmable Filter I obviously get the error: "vtkCommonDataModelPython.vtkTable'
> object has no attribute 'SMProxy'.
>
>
>
> Is there any way to do this? I've thought about using
> servermanager.CreateProxy() but I don't know how to use it and if it could
> help.
>
> Of course the easy solution could be to write the array to the disk from
> the main script and to read it from the  disk inside the programmable
> filter, but I would like to avoid passing through the disk writing that
> could be too much slow.
>
> Any help would be appreciated.
> Thank you in advance
>
> Alessandro
>
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