[vtkusers] VTK 8.0.0 OpenGL2 Invisible surfaces

[Sophonet]

I can confirm this and have seen the exact same effect here on OpenGL2. 
Likewise, I do not have any transparency set in my colors. 
Interestingly, it does not happen to all vtkPolyData objects that I 
have, but only to some of them.

The platform is similar to mine and I can add that the problem also 
occurs when having openGL Mesa-library-dlls extracted in the executable 
folder, so it does not seem to be a driver problem.

So it might actually be a bug in VTK?


On 2017-07-21 11:21, Taron wrote:
> Hi there,
> 
> I have found a strange thing switching to the new Backend OpenGL2. When 
> I
> render surfaces it seems that only one side of a face is rendered and 
> the
> other is not. Front & Backface-Culling is off for those Actors.
> This worked perfectly fine with the old Backend. Strangely enough when 
> I
> turn on Depth-Peeling in the renderer the faces are rendered correctly,
> although none of the actors has any transparency set to it.
> It is not driver related because I can reproduce this behaviour with 
> mesa
> drivers as well.
> Everything takes place under Windows 10. It is an x64 Qt (5.9) app and 
> im
> using the QVTKWidget.
> I also tried the QVTKOpenGLWidget, but it has the same issues.
> 
> Any hints what goes wrong here?
> 
> 
> 
> 
> 
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