[vtkusers] 3D Rendering rotation issue with Opacity

Ken Martin ken.martin at kitware.com
Mon Jan 16 09:05:51 EST 2017

If you want to correctly render transparent objects you need to use

For background on why see https://en.wikipedia.org/wiki/Depth_peeling


By default VTK uses alpha blending which is faster but suffers from view
dependent artifacts. In the new OpenGL2 backend depth peeling is supported
everywhere so it might be worthwhile for us to turn it on by default with
some low number of default peels for that backend.

On Mon, Jan 16, 2017 at 8:53 AM, Mikhail Pukhlikov <
mikhail.pukhlikov at outlook.com> wrote:

> Hello there!
> We're using VTK for medical imaging but there is long standing issue we
> can't understand so far
> When 3D opacity is around 0.8 rotation gives some very strange mirror
> effect when near part is becoming invisible (very transparent)
> There is issue demonstration: https://drive.google.com/file/d/0B-
> Ae8luypUS0UTdTNjd6a1hoS2M/view
> I had opened an issue there: https://gitlab.kitware.com/
> vtk/vtk/issues/16950
> Thank you,
> Mikhail
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Ken Martin PhD
Chairman & CFO
Kitware Inc.
28 Corporate Drive
Clifton Park NY 12065
518 371 3971

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