[Paraview] Parallel rendering including transparency

[Kai Winter]

The TestIceTCompositePass.cxx test is helpful for sure. It demonstrates
what I am trying to achieve.
The vtkDepthPeelingPass is not required for this simple geometry. This can
be checked by removing the line "passes->AddItem(peeling);" in
TestIceTCompositePass.cxx, which gives the same result.

What does make a difference is whether or not I remove
"iceTPass->SetKdTree(this->KdTree);". Seems like I have to apply a d3
filter to get the kdtree. I could not yet apply everything from
TestIceTCompositePass.cxx to my previous MultipassRendering.cxx example,
but I will successively simplify TestIceTCompositePass.cxx until I
understand what exactly needs to be changed.

Unless somebody can point out the necessary modifications.

Thank you!
Kai


On Wed, Apr 27, 2016 at 3:33 PM, Cory Quammen <cory.quammen at kitware.com>
wrote:

> Kai,
>
> I'm not sure if this will help, but take a look at
>
>
> http://www.paraview.org/gitweb?p=ParaView.git;a=blob;f=ParaViewCore/VTKExtensions/Testing/TestIceTCompositePass.cxx;h=9580e8642909eddef3de619dc9286cf9a0fa0a19;hb=HEAD
>
> for some possible clues. You might need to add a vtkDepthPeelingPass,
> for example.
>
> HTH,
> Cory
>
> On Tue, Apr 26, 2016 at 6:48 AM, Kai Winter <kaiwinter212 at gmail.com>
> wrote:
> > 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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>
> --
> Cory Quammen
> R&D Engineer
> Kitware, Inc.
>
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