[vtkusers] VTK 8.1.1 & Qt QML: Dual Depth Peeling not working

Sankhesh Jhaveri

2018-10-26 12:45:23 UTC

Does the issue exist only when depth peeling is enabled? Do you see it
rendering correctly when depth peeling is disabled?

Ensure that the color and depth buffers are preserved with the renderer :

_renderer->SetPreserveColorBuffer(1);
_renderer->SetPreserveDepthBuffer(1);

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The application I'm working on is based on Qt QML and I'm frequently using
VTK via the vtkExternalOpenGLRenderWindow rendering to a
QQuickFramebufferObject. Because semi-transparent geometries weren't
rendered correctly I found out about the dual depth peeling and enabled it
https://www.vtk.org/Wiki/VTK/Examples/Cxx/Visualization/CorrectlyRenderTranslucentGeometry
_renderer = vtkSmartPointer<vtkRenderer>::New();
_renderer->SetUseDepthPeeling( 1 );
_renderer->SetMaximumNumberOfPeels( 100 );
_renderer->SetOcclusionRatio( 0.1 );
_renderWindow = vtkExternalOpenGLRenderWindow::New();
_renderWindow->SetAlphaBitPlanes( 1 );
_renderWindow->SetMultiSamples( 0 );
_renderWindow->AddRenderer( _renderer );
Unfortunately all I can see now is a red background. (Note: Red isn't a
color I'm using for any objects or backgrounds)
The Versions I'm using are VTK Version 8.1.1 and Qt 5.11.2
Has anyone tried something similar with vtkExternalOpenGLRenderWindow,
QQuickFramebufferObject and Dual Depth Peeling? Or an idea what might be
the problem.
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--
Sankhesh Jhaveri *Sr. Research & Development Engineer* | Kitware
<http://www.kitware.com/> | (518) 881-4417
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