Metadata stored into GDML

Detector metadata

Detector metadata is written into the userinfo section of the output GDML file.

The structure resembles a nested dictionary, stored as follows (read auxtype → auxvalue. "value" represents a literal string):

├─ "RMG_detector" → $det_type
│  ├─ $physvol_name → $det_uid
│  ├─ $physvol_name → ":$det_uid"
│  │  # the ':' is optional
│  ├─ $physvol_name → ":$det_uid,$allow_uid_reuse,$ntuple_name"
│  │  # $allow_uid_reuse can be "true" or "false"
│  └─ [...repeat...]
├─ [...repeat...]
│
└─ "RMG_detector_meta" → ""
   ├─ $physvol_name → json($metadata)
   └─ [...repeat...]

Coloring for visualization

The color is directly attached as auxiliary data to the logical volumes:

└─ "rmg_color" → "-1" || "$r,$g,$b,$a" # components between 0 and 1