Geant4  10.00.p02
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 "G4PhysicalConstants.hh"
62 
63 void G4fissionEvent::G4SmpIsoDir(G4double* cosdiru, G4double* cosdirv, G4double* cosdirw) {
64 
65 /*
66  Description
67  determine the 3 direction cosines of a particle emitted isotropically
68 */
69 
70 /*
71  Input
72  Output
73  - 3 components of the direction cosines
74  (cosdiru, cosdirv, cosdirw)
75 */
76 
77  G4double cospolang, sinpolang, phi;
78 
79 /*
80  Choose emission angle isotropically.
81  Select a polar angle direction cosine.
82 */
83  cospolang = 1.-2.*fisslibrng();
84  sinpolang = std::sqrt(1.-std::pow(cospolang, 2.));
85 /*
86  Select an azimuthal angle uniformly on (0,2*pi)
87 */
88  phi = twopi*fisslibrng();
89  *cosdiru = sinpolang * std::cos(phi);
90  *cosdirv = sinpolang * std::sin(phi);
91  *cosdirw = cospolang;
92 }
static G4double fisslibrng(void)
Definition: G4rngc.cc:65
void G4SmpIsoDir(G4double *cosdiru, G4double *cosdirv, G4double *cosdirw)
Definition: G4SmpIsoDir.cc:63
double G4double
Definition: G4Types.hh:76