[Paraview] Parallel rendering including transparency

[Kai Winter]

Please, does anybody have a clue, how to correctly render transparent
objects in parallel?

I attach the modified version of
http://www.vtk.org/Wiki/VTK/MultiPass_Rendering_With_IceT and screenshots
of the render windows for MPI rank 0,1,2 (from left to right), first with
SetOpacity(1), second with SetOpacity(0.5). In the second case, you see the
artifacts in the blue segment, and (worse) that rank 0 shows a black window
instead of the composite image.

Thank you
Kai

On Mon, Apr 25, 2016 at 5:41 PM, Kai Winter <kaiwinter212 at gmail.com> wrote:

> Hello,
> is it possible to extend the example at
> http://www.vtk.org/Wiki/VTK/MultiPass_Rendering_With_IceT for parallel
> rendering including transparent objects?
>
> I have tried to modify the above example by first setting
>   actor->GetProperty()->SetOpacity(0.3);
> after creation of the actor, and, second, adding
>   vtkSmartPointer<vtkTranslucentPass> translucent =
> vtkSmartPointer<vtkTranslucentPass>::New();
>   passes->AddItem(translucent);
> after the original line "passes->AddItem(opaque);".
>
> The result is for example, when running with 3 MPI processes:
> The sphere segments in the partial Renderers of process 1 and 2 are
> transparent (but show some artefacts).
> The composite Renderer of process 0 doesn't show any sphere, just the
> black background!
> When the opacity is set to 1, the sphere segments are composited in three
> colors on process 0 as expected.
>
> What is required to correctly perform parallel rendering including
> transparency?
> (I am using ParaView-v5.0.1, compiled from source on Ubuntu 15.04)
>
> Thank you
> Kai
>
>
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