[vtk-developers] problem with multiple offscreen render windows

[Kathleen S. Biagas]

Thanks, I tried that, and it worked, thanks so much!

Kathleen

On Fri, 2018-03-30 at 16:44 -0400, Francois Budin wrote:
> Hello Kathleen,
> 
> 
> Could you try with the latest VTK (master branch)? I encountered a bug
> that sounds very similar to what you are describing and a patch has
> been integrated in VTK recently:
> https://gitlab.kitware.com/vtk/vtk/commit/a7988f5c530d6db31d6d9a774049c5247a9ac80c
> 
> 
> Hope this helps,
> 
> 
> Francois
> 
> 
> On Fri, Mar 30, 2018 at 4:18 PM, Kathleen S. Biagas <biagas2 at llnl.gov>
> wrote:
>         Hello,
>         
>         I used the Offscreen Renderer example from here:
>         https://lorensen.github.io/VTKExamples/site/Cxx/Utilities/OffScreenRendering/
>         
>         But I modified it for use with VTK-8 by removing the Factory
>         logic that
>         sets up Mesa classes.
>         
>         This works great.
>         
>         However, when I duplicate all the code (probably more than is
>         strictly
>         necessary) to create a second render window, then it segv's in
>         a call to
>         XQueryExtension during vtkXOpenGLRenderWindow::PopContext.
>         
>         If I comment out the logic that turns on OffScreen Rendering,
>         then it
>         doesn't crash.
>         
>         I compiled VTK-8.1 with gcc 6.2, qt 5.10.1, python 2.7.14, and
>         system
>         GL.
>         
>         This *should* work, shouldn't it?
>         
>         I've attached the OffScreenRendering source code I used, as
>         well as
>         output from a call to 'ReportCapabilities' on the
>         vtkRenderWindow.
>         
>         Kathleen
>         
>         
>         
>         
>         
>         
>         
>         
>         
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