G4MagneticFieldModel.cc

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// 
// John Allison  17th August 2013
// Michael Kelsey  31st January 2019 -- Move functionality to G4VFieldModel
//
// Class Description:
//
// Model that knows how to draw the magnetic field.

#include "G4MagneticFieldModel.hh"
#include "G4Field.hh"
#include "G4Point3D.hh"


// Return magnetic field vector for display

void G4MagneticFieldModel::
GetFieldAtLocation(const G4Field* field, const G4Point3D& position,
       G4double time, G4Point3D& result) const {
  if (!field) return;     // No action if no field

  G4double xyzt[4] = { position.x(), position.y(), position.z(), time };
  G4double BEvals[6] = {0.};    // Field returns {Bx,By,Bz,Ex,Ey,Ez}
  field->GetFieldValue(xyzt, BEvals);

  result.set(BEvals[0], BEvals[1], BEvals[2]);
  return;
}