dgcode viewer issue on macOS with HiDPI display

[willend]

[tkittel]

Looks like OpenSceneGraph or OpenGL having some sort of monitor size detection issues, or perhaps some x2 scaling I forgot that I enabled. I was wondering @willend did you by any chance have a multi-monitor setup active at the time, if that could have played a role?

[willend]

Nope, single screen on that Mac at the time

[willend]

On this machine (my newest Mac, M2 machine from ESS) the gui even works right:

• so perhaps something was simply out of sync in the conda env on my M1...

[tkittel]

Ok that's great, so it is not a general issue. However, I still suspect that there is an underlying issue related to stuff like opengl and monitors, etc. But I guess we can close this issue for now, unless we see it again elsewhere.

[tkittel]

Reopening since @willend reproduced it.

[willend]

It seems that there are ties to this old osg issue:
openscenegraph/OpenSceneGraph#926

and this one omnetpp/omnetpp#833

[willend]

WORKAROUND:

It seems that the issue only occurs on internal mac screens - or al least "HiDPI" screens left at the "Default" resolution:

A workaround is to switch to maximum resolution on the said monitor, via:

• "Advanced" -> select to "Show resolutions as list"

• Select to "Show all resolutions" and switch from (Default) to maximum resolution:
  

NB:
osg will crashe if open while resolution is changed - or if dragged between two different monitors with different settings.

[tkittel]

Thanks a lot for the workaround @willend, I will add a link to it in the documentation!

[willend]

Very likely the problem is not only on M1/M2/M3, but also Intel Macs with this type of HiDPI display

[tkittel]

That makes sense @willend, it seems this is indeed explained by openscenegraph/OpenSceneGraph#926

Unfortunately I asked the OSG maintainer, and he does not have time to make a new release (1) so we will most likely have to live with the workaround for the time being.