[Paraview] Python + ParaView

Wed Jun 8 12:17:36 EDT 2011

Also the standard calculator does have conditionals, there just isn't a
button corresponding to them on the UI. See the manual for the syntax.

David E DeMarle
Kitware, Inc.
R&D Engineer
28 Corporate Drive
Clifton Park, NY 12065-8662
Phone: 518-371-3971 x109

On Wed, Jun 8, 2011 at 12:16 PM, David E DeMarle
<dave.demarle at kitware.com>wrote:

> The python programmable filter (and the easier to use python programmable
> calculator variant of that) will get you beyond all of those limitations.
>
> David E DeMarle
> Kitware, Inc.
> R&D Engineer
> 28 Corporate Drive
> Clifton Park, NY 12065-8662
> Phone: 518-371-3971 x109
>
>
>
> On Wed, Jun 8, 2011 at 12:11 PM, Nico Schlömer <nico.schloemer at gmail.com>wrote:
>
>> > If you want to do arbitrary arithmetic, you will have to first
>> > generate the array using something like a "Calculator" filter and then
>> > color using the generated array.
>>
>> Oh, if I remember correctly I did look into this before, and found the
>> calculator filter too limited on the arithmetics that you could
>> perform. Is it still the case that you have a set of like ten
>> functions (add, multiply, sine, cosine,...) to mix and match? I need
>> to to something like
>>
>> for x in data_values:
>>    if x[0] > 0 and x[1] > 0
>>        return bla
>>    elseif ...
>>
>> -- atan2() that is.
>>
>>
>> > Yes, RGBPoints defines the mapping between scalar and color. It's a
>> > list of 4 tuples (scalar, r, g, b), repeated sequentially.
>>
>> Hm, I'll look into it. Where's the proper spot for documentation of this?
>>
>> Cheers,
>> Nico
>>
>>
>>
>>
>>
>>
>>
>> On Wed, Jun 8, 2011 at 5:25 PM, Utkarsh Ayachit
>> <utkarsh.ayachit at kitware.com> wrote:
>> > Magnitude corresponds to the magnitude of a vector, so yes, it takes
>> > the square root.
>> >
>> > If you want to do arbitrary arithmetic, you will have to first
>> > generate the array using something like a "Calculator" filter and then
>> > color using the generated array.
>> >
>> > Yes, RGBPoints defines the mapping between scalar and color. It's a
>> > list of 4 tuples (scalar, r, g, b), repeated sequentially.
>> >
>> > Utkarsh
>> >
>> > On Wed, Jun 8, 2011 at 11:19 AM, Nico Schlömer <
>> nico.schloemer at gmail.com> wrote:
>> >> Thanks for the hints.
>> >>
>> >> The Trace function in indeed quite useful in that it get you where you
>> >> want to be. When looking at the code there's still a lot of me to
>> >> understand though, the GetLookupTableForArray() call seems to be
>> >> crucial for example.
>> >>
>> >>  * The VectorMode='Magnitude' parameter seems to be responsible for
>> >> merging the two components into one scalar, but I'm not quite sure how
>> >> this is done: with a sqrt() or without? Is is possible to customize
>> >> this? I'd like to have something like ATAN2 there as well.
>> >>
>> >>  * Is the RGBPoints=[0.0, 0.0, 0.0, 0.0, 1.0, 1.0, 1.0, 1.0],
>> >> parameter responsible for the colormap?
>> >>
>> >> Cheers,
>> >> Nico
>> >>
>> >>
>> >>
>> >>
>> >>
>> >> On Wed, Jun 8, 2011 at 3:13 PM, Utkarsh Ayachit
>> >> <utkarsh.ayachit at kitware.com> wrote:
>> >>> The following wiki page talks about how to color using arrays:
>> >>>
>> http://www.paraview.org/Wiki/ParaView/Python_Scripting#Representations_and_Views
>> >>>
>> >>> The easiest way to figure out Python code equivalents is to use the
>> >>> Trace functionality to generate python trace files for actions
>> >>> performed in the GUI (accessible from Tools menu). You "Start Trace",
>> >>> do a set of actions and then "Stop Trace" and you should be able to
>> >>> view the resulting Python code.
>> >>>
>> >>> Utkarsh
>> >>>
>> >>>
>> >>>
>> >>> On Wed, Jun 8, 2011 at 9:05 AM, Nico Schlömer <
>> nico.schloemer at gmail.com> wrote:
>> >>>> Hi,
>> >>>>
>> >>>> I'm just taking first steps with ParaView's Python interface and
>> >>>> figured out so far that
>> >>>>
>> >>>> ================ *snip* ================
>> >>>> exodusReader = ExodusIIReader( FileName="solution.e" )
>> >>>> Show( exodusReader )
>> >>>> Render()
>> >>>> ================ *snap* ================
>> >>>>
>> >>>> would plot the mesh that is stored in the ExodusII file solution.e,
>> >>>> and that can play around with GetActiveView() to adjust camera angles
>> >>>> and such.
>> >>>>
>> >>>> What I haven't found out though is how to plot actual point data. I
>> get
>> >>>>
>> >>>>
>> >>>>>>> exodusReader.PointData[:]
>> >>>> [Array: GlobalNodeId, Array: PedigreeNodeId, Array: A, Array: psi,
>> >>>> Array: thickness]
>> >>>>
>> >>>> and l'm looking at the 2-component array "psi". For example, I'd like
>> >>>> to do something like
>> >>>>
>> >>>>    res =  sqrt( component1**2 + component2**2 )
>> >>>>
>> >>>> and have res[:] rendered on the mesh with a certain color map.
>> >>>>
>> >>>> Any hints?
>> >>>>
>> >>>> Cheers,
>> >>>> Nico
>> >>>> _______________________________________________
>> >>>> Powered by www.kitware.com
>> >>>>
>> >>>> Visit other Kitware open-source projects at
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>> >>>>
>> >>>> Please keep messages on-topic and check the ParaView Wiki at:
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>> >>>>
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>> >>>>
>> >>>
>> >>
>> >
>> _______________________________________________
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>>
>> Visit other Kitware open-source projects at
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>>
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>>
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