[Paraview] Python + ParaView

[Nico Schlömer]

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
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