Change WorldVolume material from Air

[aciarma]

Hi,

the WorldVolume is created automatically and it is assigned the material 'Air'.
Is there a way to change this material? (eg. to 'Vacuum')
Because I don't know where to put this attribute, as the creation of this volume is hidden.

I am working on lxplus with key4hep.

Thanks,
Andrea

[MarkusFrankATcernch]

Hi,
I think you cannot only set the material, but you have to define externally the world volume.
Please see the test example here: WorldVolume.xml

[MarkusFrankATcernch]

@aciarma Hi Andrea,
Did this answer solve your problem?
Markus

[aciarma]

Hi @MarkusFrankATcernch

sorry for the very late reply!
Actually if I do like that it seems like the world volume is created by default:

DD4hep           WARN  ++ STD conditions NOT defined by client. NTP defaults taken.
Detector         INFO  *********** Created World volume with size: 2500 2500 2500

and it is made of Air.
I am using k4run to run my scripts.

Edit:
if I do geoDisplay WorldMaterial.xml I get the following error:

DD4hep           WARN  ++ STD conditions NOT defined by client. NTP defaults taken.
RunPlugin        ERROR ++ Exception while executing plugin DD4hep_CompactLoader:
		Handle_t::child: Element [world] has no child of type 'shape'
dd4hep: while parsing ../Detector/DetFCCeeCLD/compact/FCCee_o2_v03/WorldMaterial.xml
dd4hep: with plugin:DD4hep_CompactLoader
Application      ERROR geoPluginRun: Uncaught exception: RunPlugin: ++ Exception while executing plugin DD4hep_CompactLoader:
		Handle_t::child: Element [world] has no child of type 'shape'

[MarkusFrankATcernch]

@aciarma Did you update the code and recompile?
The test is running in the release procedure. There must be some difference.

[aciarma]

I am sourcing the latest key4hep release, so DD4hep should be updated?

[MarkusFrankATcernch]

Don't know which version key4hep uses. This only works with the dd4hep PR 1126.

[aciarma]

Ok thank you very much, so I did a fresh install of DD4hep and the example works.
I expected the key4hep environment to be in sync with DD4hep, as it is an important part of it...

I tried sourcing thisdd4hep_only.sh after sourcing the key4hep setup, but I noticed that it does not overwrite the DD4hep env variables somehow, so pointing to the "wrong" ones.