Roman Pots visualization not working when geometry dumped into ROOT file

[ajentsch]

Environment: (where does this bug occur, have you tried other environments)

• Which branch (main for latest released): main
• Which revision (HEAD for the most recent):
• Any specific OS or system where the issue occurs? Mac/Docker
• Any special versions of ROOT or Geant4? No

Steps to reproduce: (give a step by step account of how to trigger the bug)

1. Produce geometry: geoConverter -compact2tgeo -input [compact_file.xml] -output [geometry].root
2. Open resulting file using a ROOT TBrowser. Other geometry component render just fine, but not the Roman Pots. It's likely to do with the overtly complicated structure to generate the geometry.

Expected Result: (what do you expect when you execute the steps above)

I except to be able to see the detector geometry.

Actual Result: (what do you get when you execute the steps above)

I do not see the detector geometry.

[simonge]

Some of this might stem from a ROOT bug/feature which is hopefully being fixed where the transparency of a volume is set at the material/medium level. The last volume which used that material appears to set the transparency for all preceding volumes built.
root-project/root#13402
I'm not certain this is the stem of all of the visualisation issues I've been seeing but the Roman Pots is not alone. A fix in ROOT will likely take a while to propagate to eic-shell if that is in fact the problem.

[ajentsch]

Ahh okay this is good to know. I will do some tests with that in mind to see if I can get the visualization to work. It's just odd because the RP and OMD are very similar and one works while the other doesn't. Thank you!

…

On Mon, Aug 7, 2023, 4:37 PM Simon Gardner ***@***.***> wrote: Some of this might stem from a ROOT bug/feature which is hopefully being fixed where the transparency of a volume is set at the material/medium level. The last volume which used that material appears to set the transparency for all preceding volumes built. <root-project/root#13402> I'm not certain this is the stem of all of the visualisation issues I've been seeing but the Roman Pots is not alone. A fix in ROOT will likely take a while to propagate to eic-shell if that is in fact the problem. — Reply to this email directly, view it on GitHub <#493 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/ADABSFZQGH4TOVMEJRMUMPDXUFGW7ANCNFSM6AAAAAA3DHVBQU> . You are receiving this because you authored the thread.Message ID: ***@***.***>

[simonge]

Removing other detectors or swapping the order they are included in the main xml file changes the visualisation, it's very strange

[agheata]

With the ROOT master, you should use TGeoVolume::ResetTransparency(char value) to set per volume (and not per material transparency). Calling ResetTransparency() with no value will use transparency per material (default behavior). See: root-project/root#13402

[Simple-Shyam]

@ajentsch, I have this feature in my visualization of geometry code where I loop over all the volumes and we can specify transparency and color for each volumes. The code can be used easily for event-display also.