[vtkusers] vtkRendererSource and vtkRenderWindow.

[Sebastien Jourdain]

I haven't try with the latest version of OSMesa, but it did work for
me with that one.

http://downloads.sourceforge.net/project/mesa3d/MesaLib/7.0.4/MesaLib-7.0.4.tar.gz

On Tue, Jun 22, 2010 at 4:34 PM, Eloisa Bentivegna
<bentivegna at cct.lsu.edu> wrote:
> Eric E. Monson ha scritto:
>>
>> Hello Eloisa,
>>
>> Hopefully someone who had actually done this will step in if I get
>> something wrong, but I wanted to get you started in what I think is the
>> correct direction. If you want to do "offscreen rendering", the current
>> method (assuming you're using a fairly recent version of VTK -- 5.4 or 5.6
>> or git) is to build OSMesa (or maybe your OS comes with it?) and have VTK
>> use that for OpenGL rendering.
>> Here's an email from last year explaining a little of this:
>>
>> http://www.vtk.org/pipermail/vtkusers/2009-April/100419.html
>>
>> Just make sure you ignore older information you come across which refer to
>> "mangled Mesa", as this isn't supported any more.
>> Then, the more current filter (instead of vtkRendererSource) is
>> vtkWindowToImageFilter:
>>
>> http://www.vtk.org/doc/nightly/html/classvtkWindowToImageFilter.html
>>
>> And there is an example of doing offscreen rendering using this filter on
>> the VTK Examples Wiki page:
>>
>> http://www.vtk.org/Wiki/VTK/Examples/OffScreenRendering
>
> Thanks for all the details!
>
> After installing a few missing packages, I was able to compile the
> off-screen example given above. However, I get:
>
>
> $ ./OffScreenRendering
>
> ERROR: In /home/bentiveg/VTK/Rendering/vtkXOpenGLRenderWindow.cxx, line 405
> vtkXOpenGLRenderWindow (0x8eb6fa0): Could not find a decent visual
>
>
> Segmentation fault
>
>
> This looks like OpenGL is still looking for a window manager, but this time
> gets confused and aborts. I've checked for any possible mixup between the
> newly installed libs that come with Mesa and the old system ones, but it
> seems like everything is working as it should. Does anyone have any further
> suggestions? I'm using VTK 5.6.0 and Mesa 7.8.2.
>
> Thanks for your help!
> Eloisa
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