[Paraview] Filter for interactive spreadsheet?

Tue Jan 17 05:08:50 EST 2017

Thanks again Andy!

I really appreciate your hints: It has already pointed me into a good
direction!

Actually what I tried for my purpose was:

1. do a selection, apply the "extract selection" filter, with the "keep
topology" option on. With this I am getting just one additional column -
"vtkInsidedness" - and this tells me whether in the initial data (actually
cells of an "unstructured grid") an item was selected (value 1) or not
(value -1).

2. on top of this I applied the "calculator" filter like you suggested, and
with just an if(1=vtkInsidedness, ...) I could get exactly what I wanted!

Bottom line: these two filters are actually my friends for the purpose!

Only two things I am still struggling:

1. if I want this procedure to be a bit more simple I should maybe still
write some kind of "wrapper filter" that does the above steps for me just
in one. Like derive one filter from the calculator, including the nice
calculator panel on the left, and just automatically do the "extract
selection" before applying the calculator

2. with the "python calculator" I was not successful, and I wonder why!?
Because if I applied that python calculator to my original "unstructured
grid" data set everything worked fine (so it is not about missing python
support!), but if I did the procedure as above, applying the "python
calculator" on the extracted data, I always got a message: "AssertionError:
Unsupported array type 15". This was independent on what was the expression
I tried to apply, even if it was just a constant value! Looking into the
source code it looks indeed like a mistake if some column has "type 15": I
found only about 10 type definitions at all...

Regards,
Cornelis

2017-01-17 10:51 GMT+01:00 Andy Bauer <andy.bauer at kitware.com>:

> Hi Cornelis,
>
> How would you like to select the single or group of values to change?
> Also, how would you like to change them (e.g. the same transformation for
> each or each with its own transformation)? These two questions are meant to
> guide you to do what you want in ParaView.
>
> You probably want to look at the Python Programmable Filter (
> http://www.paraview.org/Wiki/Python_Programmable_Filter) for changing
> individual array values. If you are working in serial you may also be able
> to bring in the entities to change based on a selection. A better solution
> would be to use the global ids filter, then do a selection on what you want
> and finally pass that in as a secondary input to the Python Programmable
> filter.
>
> Developing your own filter is also a possibility.
>
> cheers,
> Andy
>
> On Tue, Jan 17, 2017 at 1:38 AM, Cornelis Bockemühl <
> cornelis.bockemuehl at gmail.com> wrote:
>
>> Dear Andy,
>>
>> Thanks for this hint: Indeed I was not fully aware of the way how you can
>> easily add new calculated columns with these two filters! What they do is
>> some kind of "vector math", resulting in a new vector that is appended to
>> the input data set.
>>
>> However my question went in the direction of directly editing single
>> values, or groups of values.
>>
>> Example: Assume that we have a data array "Density" in some data set,
>> then I want to be able to directly change the "density" value for just a
>> few cells, or even better: for a selected set of data rows.
>>
>> Because: If such a thing does not exist yet I would consider trying to
>> write it myself - but I do not insist on reinventing any wheel! And I am
>> sometimes astonished how many "wheels" already exist in the ParaView
>> "world"...
>>
>> Regards,
>> Cornelis
>>
>> PS: Why do I never see my own posts to the paraview mailing list? Is this
>> a bug or a feature or something I am doing wrong?
>>
>> 2017-01-17 0:57 GMT+01:00 Andy Bauer <andy.bauer at kitware.com>:
>>
>>> This can be done through either the calculator or python calculator
>>> filter. If you're in the spreadsheet view it should switch over to the
>>> calculator/python calculator output when the filter is applied.
>>>
>>> On Mon, Jan 16, 2017 at 5:14 PM, Cornelis Bockemühl <
>>> cornelis.bockemuehl at gmail.com> wrote:
>>>
>>>> Has somebody already written and contributed a filter that allows some
>>>> simple "spreadsheet like" user manipulation of the data?
>>>>
>>>> I mean something that accepts some data input, then allows user
>>>> changes, and the output would be the changed data set.
>>>>
>>>> Regards,
>>>> Cornelis
>>>>
>>>> --
>>>> Cornelis Bockemühl
>>>> Basel, Schweiz
>>>>
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>>>
>>
>>
>> --
>> Cornelis Bockemühl
>> Basel, Schweiz
>>
>
>

-- 
Cornelis Bockemühl
Basel, Schweiz
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