[Paraview] Python + ParaView

[Utkarsh Ayachit]

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 http://www.kitware.com/opensource/opensource.html
>>>
>>> Please keep messages on-topic and check the ParaView Wiki at: http://paraview.org/Wiki/ParaView
>>>
>>> Follow this link to subscribe/unsubscribe:
>>> http://www.paraview.org/mailman/listinfo/paraview
>>>
>>
>