Hi,
I'm pretty sure that this is a driver issue, as it looks like wrong blitting in
VRAM. There's a slight chance that maybe VTK is involved but I doubt that
because of the temporary character of the glitch. Qt may also play a role here
if there's context sharing. Is it possible to up- or downgrade the graphics
driver? You could also try to deactivate any kind of power saving plan for the
GPU. For example, if you have a Nvidia GPU, you can set the PowerMizer mode in
the Nvidia Settings to "maximum performance". This solved some rendering issues
for me in the past on Linux. It would also explain why the issue is sometimes
there and sometimes it is not. Note that the PowerMizer mode setting is not
persistent between restarts or even between runs of the Nvidia settings app. If
it does the job, you would need to add it manually to the hidden Nvidia
settings file in your home directory with a line like "GPUPowerMizerMode=1"
(everytime after you ran the Nvidia settings app as it overrides the config
file again).
Best,
Stefan
________________________________
Von: Miklos Espak <m.es...@ucl.ac.uk>
Gesendet: Mittwoch, 21. Juni 2017 16:30
An: mitk-users
Betreff: [mitk-users] Flickering image in render window
Hi,
I noticed some weird rendering issues.
Screenshot and video here:
https://drive.google.com/drive/folders/0Bz-0EIzNgFvMRXdoR2taeWlnaU0
This happened with MITK 2015.05.2 and Qt4 on CentOS 6, and it's not consistent,
so can't open a ticket.
I am wondering if anyone has seen this, maybe it's been resolved in a newer
VTK/Qt/MITK?
The issue in words:
Three images were loaded into our viewer based on QmitkStdMultiWidget. A grey
scale (T1), a binary mask and an RGB image (DWI). The T1 was at the bottom
layer, the RGB and the mask was over it. The images were not transparent
(opacity=1.0), the mask was rendered as contour.
When you scrolled through the slices, the image is "flickering". When changing
slice, you could see the T1 for the fragment of a second and then it was
covered by the RGB again.
On top of that, an annotation that should only appear in the bottom right
corner, was overlaid on the image with very big letters.
Cheers,
Miklos
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