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.schloe...@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.ayac...@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.schloe...@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.ayac...@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.schloe...@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 > >>>> > >>> > >> > > > _______________________________________________ > 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 >
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