[Paraview] ParaView v3.9.0: problems with exporter plug-in

[Utkarsh Ayachit]

Don't use vtkMapper::GetInput(), that downcasts to vtkPolyData. Using
GetInputDataObject(..) API. That should return you the dataobject. It
may be a vtkCOmpositeDataSet (since ParaView no longer merges blocks
in composite dataset before rendering). You'll have to handle each
block in your exporter.

Utkarsh

On Tue, Jan 18, 2011 at 7:08 AM, Nenad Vujicic <nenadus at gmail.com> wrote:
> Hello everyone,
>
> Because of Xdmf problems inside of v3.8.1, I tried to use my exporter
> plug-in with current v3.9.0 sources. I downloaded sources from Git
> repository and compiled them with Visual Studio 2008 SP1, Python 2.7
> and OpenMPI 1.4.3. Unfortunately, in exported scene I got only center
> of rotation axes and orientation axes.
>
> After closer inspection, I made very short snipped that shows the
> problem. In class derived from vtkExporter, in function WriteData() I
> override, I call following sequence:
>
>   - for every renderer in RenderWindow
>     - for every actor in renderer // only 3d actors
>       - mapper = actor.GetMapper()
>       - if(mapper != NULL)
>         - mappers_input = mapper.GetInput()
>         - print mappers_input // PROBLEM: NULL for whatever I add to
> pipeline, instead of 2 axes meshes
>
> At the moment, I read 3 renderers, the first renderer has 5 actors (2
> for center of rotation axes mesh and 3 LOD actors), the second 0 and
> the third has 9 actors (all for orientation axes mesh). The problem is
> in 3 LOD actors for which I get vtkCompositePolyDataMapper2 objects as
> mappers, but which return NULL on GetInput() always! In v3.8.x I used
> same mechanism to get vtkPolyData and other data sets from which I
> would later extract scene's properties.
>
> Am I doing something wrong or exporter's part still requires some work
> before v3.9.0 is released? Btw, similar occurs when I try to export
> scene to VRML - only center of rotation axes mesh is exported.
>
> Thanks,
> Nenad.
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