Geant4  v4-10.4-release
G4SmpIsoDir.cc
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56 // $Id: G4SmpIsoDir.cc 67966 2013-03-13 09:38:38Z gcosmo$
57 //
58
59 #include <cmath>
60 #include "G4fissionEvent.hh"
61 #include "G4Pow.hh"
62 #include "G4PhysicalConstants.hh"
63
64 void G4fissionEvent::G4SmpIsoDir(G4double* cosdiru, G4double* cosdirv, G4double* cosdirw) {
65
66 /*
67  Description
68  determine the 3 direction cosines of a particle emitted isotropically
69 */
70
71 /*
72  Input
73  Output
74  - 3 components of the direction cosines
75  (cosdiru, cosdirv, cosdirw)
76 */
77
78  G4double cospolang, sinpolang, phi;
79
80 /*
81  Choose emission angle isotropically.
82  Select a polar angle direction cosine.
83 */
85  cospolang = 1.-2.*fisslibrng();
86  sinpolang = std::sqrt(1.-Pow->powA(cospolang, 2.));
87 /*
88  Select an azimuthal angle uniformly on (0,2*pi)
89 */
90  phi = twopi*fisslibrng();
91  *cosdiru = sinpolang * std::cos(phi);
92  *cosdirv = sinpolang * std::sin(phi);
93  *cosdirw = cospolang;
94 }
void G4SmpIsoDir(G4double *cosdiru, G4double *cosdirv, G4double *cosdirw)
Definition: G4SmpIsoDir.cc:64
double G4double
Definition: G4Types.hh:76
static G4Pow * GetInstance()
Definition: G4Pow.cc:57
G4double powA(G4double A, G4double y) const
Definition: G4Pow.hh:242
static constexpr double twopi
Definition: G4SIunits.hh:76
Definition: G4Pow.hh:56
static G4double fisslibrng(void)
Definition: G4rngc.cc:65