MagGeometry.cc

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/*
 *  See header file for a description of this class.
 *
 *  \author N. Amapane - INFN Torino
 */

#include "MagneticField/VolumeBasedEngine/interface/MagGeometry.h"
#include "MagneticField/VolumeGeometry/interface/MagVolume.h"
#include "MagneticField/VolumeGeometry/interface/MagVolume6Faces.h"
#include "MagneticField/Layers/interface/MagBLayer.h"
#include "MagneticField/Layers/interface/MagESector.h"

#include "Utilities/BinningTools/interface/PeriodicBinFinderInPhi.h"

#include "FWCore/Utilities/interface/isFinite.h"

#include "MagneticField/Layers/interface/MagVerbosity.h"
#include "FWCore/MessageLogger/interface/MessageLogger.h"

using namespace std;
using namespace edm;

MagGeometry::MagGeometry(int geomVersion, const std::vector<MagBLayer *>& tbl,
             const std::vector<MagESector *>& tes,
             const std::vector<MagVolume6Faces*>& tbv,
             const std::vector<MagVolume6Faces*>& tev) :
  MagGeometry(geomVersion, reinterpret_cast<std::vector<MagBLayer const*> const&>(tbl), reinterpret_cast<std::vector<MagESector const*> const&>(tes), 
          reinterpret_cast<std::vector<MagVolume6Faces const*> const&>(tbv), reinterpret_cast<std::vector<MagVolume6Faces const*> const&>(tev)) {}

MagGeometry::MagGeometry(int geomVersion, const std::vector<MagBLayer const*>& tbl,
             const std::vector<MagESector const*>& tes,
             const std::vector<MagVolume6Faces const*>& tbv,
             const std::vector<MagVolume6Faces const*>& tev) : 
  lastVolume(0), theBLayers(tbl), theESectors(tes), theBVolumes(tbv), theEVolumes(tev), cacheLastVolume(true), geometryVersion(geomVersion)
{
  vector<double> rBorders;

  for (vector<MagBLayer const*>::const_iterator ilay = theBLayers.begin();
       ilay != theBLayers.end(); ++ilay) {
    if (verbose::debugOut) cout << "  Barrel layer at " << (*ilay)->minR() <<endl;
    //FIXME assume layers are already sorted in minR
    rBorders.push_back((*ilay)->minR());
  }

  theBarrelBinFinder = new MagBinFinders::GeneralBinFinderInR<double>(rBorders);

  if (verbose::debugOut) {
    for (vector<MagESector const*>::const_iterator isec = theESectors.begin();
     isec != theESectors.end(); ++isec) {
      cout << "  Endcap sector at " << (*isec)->minPhi() << endl;
    }
  }

  //FIXME assume sectors are already sorted in phi
  //FIXME: PeriodicBinFinderInPhi gets *center* of first bin
  int nEBins = theESectors.size();
  theEndcapBinFinder = new PeriodicBinFinderInPhi<float>(theESectors.front()->minPhi()+Geom::pi()/nEBins, nEBins);

}

MagGeometry::~MagGeometry(){
  delete theBarrelBinFinder;
  delete theEndcapBinFinder;

  for (vector<MagBLayer const*>::const_iterator ilay = theBLayers.begin();
       ilay != theBLayers.end(); ++ilay) {
    delete (*ilay);
  }

  for (vector<MagESector const*>::const_iterator ilay = theESectors.begin();
       ilay != theESectors.end(); ++ilay) {
    delete (*ilay);
  }
}


// Return field vector at the specified global point
GlobalVector MagGeometry::fieldInTesla(const GlobalPoint & gp) const {
  MagVolume const * v = 0;

  
  v = findVolume(gp);
  if (v!=0) {
    return v->fieldInTesla(gp);
  }
  
  // Fall-back case: no volume found
  
  if (edm::isNotFinite(gp.mag())) {
    LogWarning("InvalidInput") << "Input value invalid (not a number): " << gp << endl;
      
  } else {
    LogWarning("MagneticField") << "MagGeometry::fieldInTesla: failed to find volume for " << gp << endl;
  }
  return GlobalVector();
}


// Linear search implementation (just for testing)
MagVolume const* 
MagGeometry::findVolume1(const GlobalPoint & gp, double tolerance) const {  

  MagVolume6Faces const* found = 0;

  if (inBarrel(gp)) { // Barrel
    for (vector<MagVolume6Faces const*>::const_iterator v = theBVolumes.begin();
     v!=theBVolumes.end(); ++v){
      if ((*v)==0) { //FIXME: remove this check
    cout << endl << "***ERROR: MagGeometry::findVolume: MagVolume not set" << endl;
    continue;
      }
      if ((*v)->inside(gp,tolerance)) {
    found = (*v);
    break;
      }
    }

  } else { // Endcaps
    for (vector<MagVolume6Faces const*>::const_iterator v = theEVolumes.begin();
     v!=theEVolumes.end(); ++v){
      if ((*v)==0) {  //FIXME: remove this check
    cout << endl << "***ERROR: MagGeometry::findVolume: MagVolume not set" << endl;
    continue;
      }
      if ((*v)->inside(gp,tolerance)) {
    found = (*v);
    break;
      }
    }
  }  
  
  return found;
}

// Use hierarchical structure for fast lookup.
MagVolume const* 
MagGeometry::findVolume(const GlobalPoint & gp, double tolerance) const{
  // Check volume cache
  auto lastVolumeCheck = lastVolume.load(std::memory_order_acquire);
  if (lastVolumeCheck!=nullptr && lastVolumeCheck->inside(gp)){
    return lastVolumeCheck;
  }

  MagVolume const* result=0;
  if (inBarrel(gp)) { // Barrel
    double R = gp.perp();
    int bin = theBarrelBinFinder->binIndex(R);
    
    // Search up to 3 layers inwards. This may happen for very thin layers.
    for (int bin1 = bin; bin1 >= max(0,bin-3); --bin1) {
      if (verbose::debugOut) cout << "Trying layer at R " << theBLayers[bin1]->minR()
              << " " << R << endl ;
      result = theBLayers[bin1]->findVolume(gp, tolerance);
      if (verbose::debugOut) cout << "***In blayer " << bin1-bin << " " 
              << (result==0? " failed " : " OK ") <<endl;
      if (result != 0) break;
    }

  } else { // Endcaps
    Geom::Phi<float> phi = gp.phi();
    int bin = theEndcapBinFinder->binIndex(phi);
    if (verbose::debugOut) cout << "Trying endcap sector at phi "
            << theESectors[bin]->minPhi() << " " << phi << endl ;
    result = theESectors[bin]->findVolume(gp, tolerance);
    if (verbose::debugOut) cout << "***In guessed esector "
            << (result==0? " failed " : " OK ") <<endl;
  }


  if (result==0 && tolerance < 0.0001) {
    // If search fails, retry with a 300 micron tolerance.
    // This is a hack for thin gaps on air-iron boundaries,
    // which will not be present anymore once surfaces are matched.
    if (verbose::debugOut) cout << "Increasing the tolerance to 0.03" <<endl;
    result = findVolume(gp, 0.03);
  }

  if (cacheLastVolume) lastVolume.store(result,std::memory_order_release);

  return result;
}




bool MagGeometry::inBarrel(const GlobalPoint& gp) const {
  float Z = fabs(gp.z());
  float R = gp.perp();

  // FIXME: Get these dimensions from the builder. 
  if (geometryVersion>=120812) {
    return (Z<350. ||
        (R>172.4 && Z<633.29) || 
        (R>308.735 && Z<662.01));    
  } else if (geometryVersion>=90812) { // FIXME no longer supported
    return (Z<350. ||
        (R>172.4 && Z<633.89) || 
        (R>308.755 && Z<662.01));
  } else { // versions 71212, 90322
    return (Z<350. ||
        (R>172.4 && Z<633.29) || 
        (R>308.755 && Z<661.01));
  }
}