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The validation of the ECAL Reco geometry in the old DDD way and new DD4hep way is done with two dumpers present in Geometry/EcalAlgo/test/python : 1) runEcalCellDumpDDD_cfg.py for DDD 2) runEcalCellDumpDD4hep_cfg.py for DD4hep
These dump the position, backface, dimensions and the 8 corner-coordinates of each ECAL crystal in EB and EE.
For this two analyzers are used ecalBarrelCellParameterDump.cc and ecalEndcapCellParameterDump.cc which are present in: Geometry/EcalAlgo/test
To dump these into a file execute: cmsRun PATH_TO_CONFIG/runEcalCellDumpDD4hep_cfg.py > ECAL_cellParams_DD4hep_Dump.txt and similarly for the DDD config. The dump will be found to be identical.