[Paraview] PV4.1, Custom Dock Widget: How to automatically add a glyph3d filter after loading data ?

[Utkarsh Ayachit]

Attached is an example based on ParaView 4.2-RC1. As it shows, you
cannot directly use VTK objects to create visualization pipelines in
ParaView. While this can surely be done with 4.1 or earlier, I'd
suggest basing off 4.2, if possible since it simplified a lot of this
initialization.

Utkarsh

On Mon, Sep 15, 2014 at 10:23 AM, Florian Hoffmann
<florian.hoffmann at inutech.de> wrote:
> I would like to automatically add a glyph filter and render the correctly
> scaled spheres after the user has opened a file in my custom dock widget.
> I created a DockWidget using the example in /examples/Plugins/DockWidget.
> When pressing a button a specific file is being opened for the user by the
> following calls:
>
>  void on_button_clicked()
> {
>         QString xdmfFile = "C:\\..\\unknown_case.xdmf";
>
>     QStringList visuFiles;
>
>     visuFiles.append(xdmfFile);
>
>     pqPipelineSource* pqPlinesource =
> pqLoadDataReaction::loadData(visuFiles);
>
>     pqPlinesource->updatePipeline();
>
>    // TODO:
>    // add spherical glyph for loaded polyData
>    // scale spherical glyphs by a scalar attribute/property
>    // render glyphs
>
> }
>
> I would like to include that the code automatically adds spherical glyphs
> and renders them for the data just loaded.
>
> I tried the following code but I am not sure if it works
>
>                 vtkSMProxy *myProxy = pqPlinesource->getProxy();
>
>         vtkObjectBase *myObject = myProxy->GetClientSideObject();
>
>         vtkAlgorithm *myvtkAlgo = vtkAlgorithm::SafeDownCast(myObject);
>
>         vtkGlyph3D *myspheres =  vtkGlyph3D::New();
>
>         myspheres->SetSourceConnection(myvtkAlgo->GetOutputPort());
>
>
>
> In case this is supposed to work, how can I now update the pipeline and
> render the spheres using C++ PV core functionality ? (The user should also
> see the result in the pipeline browser dock of the GUI).
>
> In case my approach is totally wrong, what would be the right way of
> handling this situation ?
>
> Thank you.
>
> Best regards,
>
> Florian
>
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