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| 1 | +#if !defined(__CLING__) || defined(__ROOTCLING__) |
| 2 | +#include <TFile.h> |
| 3 | +#include <TGeoGlobalMagField.h> |
| 4 | +#include "Field/MagneticField.h" |
| 5 | +#include "DataFormatsParameters/GRPObject.h" |
| 6 | +#include <string> |
| 7 | +#endif |
| 8 | + |
| 9 | + |
| 10 | +using o2field = o2::field::MagneticField; |
| 11 | +using GRP = o2::parameters::GRPObject; |
| 12 | +void initFieldFromGRP(const o2::parameters::GRPObject* grp); |
| 13 | + |
| 14 | +int initSimGeomAndField(std::string geomFileName="O2geometry.root", |
| 15 | + std::string grpFileName="o2sim_grp.root", |
| 16 | + std::string geomName="FAIRGeom", |
| 17 | + std::string grpName="GRP") |
| 18 | +{ |
| 19 | + printf("Loading geometry from %s\n",geomFileName.data()); |
| 20 | + TFile flGeom(geomFileName.data()); |
| 21 | + if ( flGeom.IsZombie() ) { |
| 22 | + return -1; |
| 23 | + } |
| 24 | + if ( !flGeom.Get(geomName.data()) ) { |
| 25 | + return -2; |
| 26 | + } |
| 27 | + |
| 28 | + // |
| 29 | + printf("Loading field from GRP of %s\n",grpFileName.data()); |
| 30 | + TFile flGRP(grpFileName.data()); |
| 31 | + if ( flGRP.IsZombie() ) { |
| 32 | + return -10; |
| 33 | + } |
| 34 | + auto grp = static_cast<GRP*>(flGRP.GetObjectChecked(grpName.data(), |
| 35 | + GRP::Class())); |
| 36 | + if (!grp) { |
| 37 | + return -12; |
| 38 | + } |
| 39 | + grp->print(); |
| 40 | + initFieldFromGRP(grp); |
| 41 | + return 0; |
| 42 | +} |
| 43 | + |
| 44 | +void initFieldFromGRP(const GRP* grp) |
| 45 | +{ |
| 46 | + if ( TGeoGlobalMagField::Instance()->IsLocked() ) { |
| 47 | + if (TGeoGlobalMagField::Instance()->GetField()->TestBit(o2field::kOverrideGRP)) { |
| 48 | + printf("ExpertMode!!! GRP information will be ignored\n"); |
| 49 | + printf("ExpertMode!!! Running with the externally locked B field\n"); |
| 50 | + return; |
| 51 | + } |
| 52 | + else { |
| 53 | + printf("Destroying existing B field instance\n"); |
| 54 | + delete TGeoGlobalMagField::Instance(); |
| 55 | + } |
| 56 | + } |
| 57 | + auto fld = o2field::createFieldMap(grp->getL3Current(), grp->getDipoleCurrent()); |
| 58 | + TGeoGlobalMagField::Instance()->SetField( fld ); |
| 59 | + TGeoGlobalMagField::Instance()->Lock(); |
| 60 | + printf("Running with the B field constructed out of GRP\n"); |
| 61 | + printf("Access field via TGeoGlobalMagField::Instance()->Field(xyz,bxyz) or via\n"); |
| 62 | + printf("auto o2field = static_cast<o2::field::MagneticField*>( TGeoGlobalMagField::Instance()->GetField() )\n"); |
| 63 | + |
| 64 | +} |
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