Gabriele Cosmo
387 lines
9.6 KiB
C++
387 lines
9.6 KiB
C++
// This code implementation is the intellectual property of
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// the GEANT4 collaboration.
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//
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// By copying, distributing or modifying the Program (or any work
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// based on the Program) you indicate your acceptance of this statement,
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// and all its terms.
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//
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// $Id: G4OpBoundaryProcess.hh,v 1.5 1999/12/15 14:53:44 gunter Exp $
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// GEANT4 tag $Name: geant4-03-01 $
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//
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//
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////////////////////////////////////////////////////////////////////////
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// Optical Photon Boundary Process Class Definition
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////////////////////////////////////////////////////////////////////////
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//
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// File: G4OpBoundaryProcess.hh
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// Description: Discrete Process -- reflection/refraction at
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// optical interfaces
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// Version: 1.1
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// Created: 1997-06-18
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// Modified: 1999-10-29 add method and class descriptors
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// 1999-10-10 - Fill NewMomentum/NewPolarization in
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// DoAbsorption. These members need to be
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// filled since DoIt calls
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// aParticleChange.SetMomentumChange etc.
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// upon return (thanks to: Clark McGrew)
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//
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// Author: Peter Gumplinger
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// adopted from work by Werner Keil - April 2/96
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// mail: gum@triumf.ca
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//
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// CVS version tag:
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////////////////////////////////////////////////////////////////////////
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#ifndef G4OpBoundaryProcess_h
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#define G4OpBoundaryProcess_h 1
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/////////////
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// Includes
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/////////////
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#include "globals.hh"
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#include "templates.hh"
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#include "geomdefs.hh"
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#include "Randomize.hh"
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#include "G4Step.hh"
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#include "G4VDiscreteProcess.hh"
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#include "G4DynamicParticle.hh"
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#include "G4Material.hh"
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#include "G4LogicalBorderSurface.hh"
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#include "G4LogicalSkinSurface.hh"
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#include "G4OpticalSurface.hh"
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#include "G4OpticalPhoton.hh"
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#include "G4TransportationManager.hh"
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// Class Description:
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// Discrete Process -- reflection/refraction at optical interfaces.
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// Class inherits publicly from G4VDiscreteProcess.
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// Class Description - End:
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/////////////////////
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// Class Definition
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/////////////////////
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class G4OpBoundaryProcess : public G4VDiscreteProcess
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{
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enum G4OpBoundaryProcessStatus { Undefined,
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FresnelRefraction, FresnelReflection,
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TotalInternalReflection,
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LambertianReflection, LobeReflection,
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SpikeReflection, BackScattering,
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Absorption, Detection };
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private:
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//////////////
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// Operators
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//////////////
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// G4OpBoundaryProcess& operator=(const G4OpBoundaryProcess &right);
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// G4OpBoundaryProcess(const G4OpBoundaryProcess &right);
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public: // Without description
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////////////////////////////////
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// Constructors and Destructor
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////////////////////////////////
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G4OpBoundaryProcess(const G4String& processName = "Boundary");
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~G4OpBoundaryProcess();
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////////////
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// Methods
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////////////
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public: // With description
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G4bool IsApplicable(const G4ParticleDefinition& aParticleType);
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// Returns true -> 'is applicable' only for an optical photon.
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G4double GetMeanFreePath(const G4Track& ,
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G4double ,
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G4ForceCondition* condition);
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// Returns infinity; i. e. the process does not limit the step,
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// but sets the 'Forced' condition for the DoIt to be invoked at
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// every step. However, only at a boundary will any action be
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// taken.
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G4VParticleChange* PostStepDoIt(const G4Track& aTrack,
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const G4Step& aStep);
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// This is the method implementing boundary processes.
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G4OpticalSurfaceModel GetModel() const;
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// Returns the optical surface mode.
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void SetModel(G4OpticalSurfaceModel model);
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// Set the optical surface model to be followed
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// (glisur || unified).
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private:
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void G4Swap(G4double* a, G4double* b) const;
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void G4Swap(G4Material* a, G4Material* b) const;
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void G4VectorSwap(G4ThreeVector* vec1, G4ThreeVector* vec2) const;
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G4bool G4BooleanRand(const G4double prob) const;
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G4ThreeVector G4IsotropicRand() const;
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G4ThreeVector G4LambertianRand(const G4ThreeVector& normal);
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G4ThreeVector G4PlaneVectorRand(const G4ThreeVector& normal) const;
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G4ThreeVector GetFacetNormal(const G4ThreeVector& Momentum,
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const G4ThreeVector& Normal) const;
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void DielectricMetal();
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void DielectricDielectric();
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void ChooseReflection();
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void DoAbsorption();
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void DoReflection();
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private:
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G4double thePhotonMomentum;
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G4ThreeVector OldMomentum;
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G4ThreeVector OldPolarization;
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G4ThreeVector NewMomentum;
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G4ThreeVector NewPolarization;
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G4ThreeVector theGlobalNormal;
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G4ThreeVector theFacetNormal;
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G4Material* Material1;
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G4Material* Material2;
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G4OpticalSurface* OpticalSurface;
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G4double Rindex1;
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G4double Rindex2;
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G4double cost1, cost2, sint1, sint2;
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G4OpBoundaryProcessStatus theStatus;
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G4OpticalSurfaceModel theModel;
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G4OpticalSurfaceFinish theFinish;
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G4double theReflectivity;
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G4double theEfficiency;
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G4double prob_sl, prob_ss, prob_bs;
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};
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////////////////////
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// Inline methods
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////////////////////
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inline
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void G4OpBoundaryProcess::G4Swap(G4double* a, G4double* b) const
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{
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// swaps the contents of the objects pointed
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// to by 'a' and 'b'!
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G4double temp;
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temp = *a;
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*a = *b;
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*b = temp;
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}
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inline
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void G4OpBoundaryProcess::G4Swap(G4Material* a, G4Material* b) const
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{
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// ONLY swaps the pointers; i.e. what used to be pointed
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// to by 'a' is now pointed to by 'b' and vice versa!
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G4Material* temp = a;
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a = b;
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b = temp;
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}
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inline
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void G4OpBoundaryProcess::G4VectorSwap(G4ThreeVector* vec1,
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G4ThreeVector* vec2) const
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{
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// swaps the contents of the objects pointed
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// to by 'vec1' and 'vec2'!
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G4ThreeVector temp;
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temp = *vec1;
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*vec1 = *vec2;
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*vec2 = temp;
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}
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inline
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G4bool G4OpBoundaryProcess::G4BooleanRand(const G4double prob) const
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{
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/* Returns a random boolean variable with the specified probability */
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return (G4UniformRand() < prob);
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}
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inline
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G4ThreeVector G4OpBoundaryProcess::G4IsotropicRand() const
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{
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/* Returns a random isotropic unit vector. */
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G4ThreeVector vect;
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G4double len2;
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do {
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vect.setX(G4UniformRand() - 0.5);
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vect.setY(G4UniformRand() - 0.5);
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vect.setZ(G4UniformRand() - 0.5);
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len2 = vect.mag2();
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} while (len2 < 0.01 || len2 > 0.25);
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return vect.unit();
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}
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inline
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G4ThreeVector G4OpBoundaryProcess::
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G4LambertianRand(const G4ThreeVector& normal)
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{
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/* Returns a random lambertian unit vector. */
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G4ThreeVector vect;
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G4double ndotv;
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do {
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vect = G4IsotropicRand();
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ndotv = normal * vect;
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if (ndotv < 0.0) {
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vect = -vect;
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ndotv = -ndotv;
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}
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} while (!G4BooleanRand(ndotv));
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return vect;
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}
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inline
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G4ThreeVector G4OpBoundaryProcess::
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G4PlaneVectorRand(const G4ThreeVector& normal) const
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/* This function chooses a random vector within a plane given
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by the unit normal */
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{
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G4ThreeVector vec1 = normal.orthogonal();
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G4ThreeVector vec2 = vec1.cross(normal);
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G4double cost = 2.*G4UniformRand() - 1.0;
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G4double sint = sqrt(1.0 - cost * cost);
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return cost * vec1 + sint * vec2;
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}
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inline
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G4bool G4OpBoundaryProcess::IsApplicable(const G4ParticleDefinition&
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aParticleType)
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{
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return ( &aParticleType == G4OpticalPhoton::OpticalPhoton() );
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}
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inline
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G4OpticalSurfaceModel G4OpBoundaryProcess::GetModel() const
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{
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return theModel;
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}
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inline
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void G4OpBoundaryProcess::SetModel(G4OpticalSurfaceModel model)
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{
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theModel = model;
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}
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inline
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void G4OpBoundaryProcess::ChooseReflection()
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{
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G4double rand = G4UniformRand();
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if ( rand >= 0.0 && rand < prob_ss ) {
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theStatus = SpikeReflection;
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theFacetNormal = theGlobalNormal;
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}
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else if ( rand >= prob_ss &&
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rand <= prob_ss+prob_sl) {
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theStatus = LobeReflection;
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}
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else if ( rand > prob_ss+prob_sl &&
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rand < prob_ss+prob_sl+prob_bs ) {
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theStatus = BackScattering;
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}
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else {
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theStatus = LambertianReflection;
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}
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}
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inline
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void G4OpBoundaryProcess::DoAbsorption()
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{
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theStatus = Absorption;
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if ( G4BooleanRand(theEfficiency) ) {
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// EnergyDeposited =/= 0 means: photon has been detected
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theStatus = Detection;
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aParticleChange.SetLocalEnergyDeposit(thePhotonMomentum);
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}
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else {
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aParticleChange.SetLocalEnergyDeposit(0.0);
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}
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NewMomentum = OldMomentum;
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NewPolarization = OldPolarization;
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// aParticleChange.SetEnergyChange(0.0);
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aParticleChange.SetStatusChange(fStopAndKill);
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}
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inline
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void G4OpBoundaryProcess::DoReflection()
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{
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if ( theStatus == LambertianReflection ) {
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NewMomentum = G4LambertianRand(theGlobalNormal);
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theFacetNormal = (NewMomentum - OldMomentum).unit();
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}
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else if ( theFinish == ground ) {
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theStatus = LobeReflection;
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theFacetNormal = GetFacetNormal(OldMomentum,theGlobalNormal);
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G4double PdotN = OldMomentum * theFacetNormal;
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NewMomentum = OldMomentum - (2.*PdotN)*theFacetNormal;
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}
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else {
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theStatus = SpikeReflection;
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theFacetNormal = theGlobalNormal;
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G4double PdotN = OldMomentum * theFacetNormal;
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NewMomentum = OldMomentum - (2.*PdotN)*theFacetNormal;
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}
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G4double EdotN = OldPolarization * theFacetNormal;
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NewPolarization = -OldPolarization + (2.*EdotN)*theFacetNormal;
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}
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#endif /* G4OpBoundaryProcess_h */
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