[FCCeeMDI] Use absolute path to import CAD files

[BrieucF]

BEGINRELEASENOTES

• [FCCeeMDI] Use absolute path to import CAD files

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It looks like, when importing CAD file with <shape type="CAD_MultiVolume" ref="path_to_stl_file" unit="mm" material="LiquidNDecane">, the path is relative to where the ddsim command is launched

[andresailer]

This should work AIDASoft/DD4hep#1175 with recent enough DD4hep versions?

1.27 and newer
https://github.com/AIDASoft/DD4hep/blob/master/doc/ReleaseNotes.md#v01-27

[BrieucF]

I have opened an issue in DD4hep (AIDASoft/DD4hep#1313). Can we merge this regardless of the issue? I'd keep it like this even after the fix.

[andresailer]

I think this rather is an issue for key4hep-spack though. Because it comes down to ROOT with pcre2 (I think), which we have no control over in DD4hep.

[BrieucF]

I see. Does this prevent merging this PR?

[andresailer]

Apart from the full path making it harder to changing the files and trying things out with ones own copy of a folder. No, nothing prevents merging these changes.

[andresailer]

By the way

It looks like, when importing CAD file with , the path is relative to where the ddsim command is launched

Is this your interpretation of the TPRegexp error mentioned in the DD4hep issue, or was this a different error message that caused the conclusion written here?

[BrieucF]

Is this your interpretation of the TPRegexp error mentioned in the DD4hep issue, or was this a different error message that caused the conclusion written here?

No no, it comes from the fact that running examples/DDCAD/compact/Check_Shape_RelativePath.xml from the DD4hep directory does not work, while going to examples/DDCAD/compact/ and running it from there works, as I tried to explain in AIDASoft/DD4hep#1313. The mention of the TPRegexp error was just a side note that it is not easy to understand that the problem is "not finding the CAD file" based on the error message.

[andresailer]

It does not work in the way that there is the TPRegex error?

[BrieucF]

Yes