[vtkusers] VTK 8.0.0 OpenGL2 Invisible surfaces

[Ken Martin]

VTK thinks your surface is translucent. The logic changed in OpenGL2 and so
something in your object indicates the possibility of transparency.  The
options include

- opacity < 1.0
- a lookup table/ color transfer function with some opacity values < 1.0
- a texture map with (< 1.0?) alpha values

You can force VTK to treat your object as Opaque using the ForceOpaqe
option on Actor/Property one of those I think.



On Fri, Jul 21, 2017 at 5:21 AM, Taron <taron2000 at gmx.de> 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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-- 
Ken Martin PhD
Distinguished Engineer
Kitware Inc.
28 Corporate Drive
Clifton Park NY 12065

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