Import Geant4 11.4.0 source tree

source/processes/optical/include/G4OpBoundaryProcess.hh

@@ -170,6 +170,11 @@ class G4OpBoundaryProcess : public G4VDiscreteProcess
   void ChooseReflection();
   void DoAbsorption();
   void DoReflection();
+  void DoTransmission();
+
+  void ApplyDielectricBoundaryTransition(G4double cost, G4bool roughnessPass,
+                                         G4bool& inside, G4bool& swap);
+  // Apply boundary actions at a dielectric–dielectric interface
 
   G4double GetIncidentAngle();
   // Returns the incident angle of optical photon
@@ -191,6 +196,12 @@ class G4OpBoundaryProcess : public G4VDiscreteProcess
   // Invoke SD for post step point if the photon is 'detected'
   G4bool InvokeSD(const G4Step* step);
 
+  // Check if the given surface finish corresponds to a backpainted surface
+  static constexpr G4bool IsBackpainted(G4OpticalSurfaceFinish finish) noexcept
+  {
+    return finish == polishedbackpainted || finish == groundbackpainted;
+  }
+
   G4ThreeVector fOldMomentum;
   G4ThreeVector fOldPolarization;
 
@@ -321,6 +332,15 @@ inline void G4OpBoundaryProcess::DoAbsorption()
   aParticleChange.ProposeTrackStatus(fStopAndKill);
 }
 
+inline void G4OpBoundaryProcess::DoTransmission()
+{
+  // Optical photons pass through the boundary without changing momentum or
+  // polarization
+  fStatus = Transmission;
+  fNewMomentum = fOldMomentum;
+  fNewPolarization = fOldPolarization;
+}
+
 inline void G4OpBoundaryProcess::DoReflection()
 {
   if(fStatus == LambertianReflection)