| Geant4 Cross Reference |
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27 // This software was developed by Lawrence Livermore National Laboratory.
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51 // Copyright (c) 2006 The Regents of the University of California.
52 // All rights reserved.
53 // UCRL-CODE-224807
54 //
55 //
56 //
57
58 #include <cmath>
59 #include "G4fissionEvent.hh"
60 #include "G4PhysicalConstants.hh"
61
62 void G4fissionEvent::G4SmpIsoDir(G4double* cosdiru, G4double* cosdirv, G4double* cosdirw) {
63
64 /*
65 Description
66 determine the 3 direction cosines of a particle emitted isotropically
67 */
68
69 /*
70 Input
71 Output
72 - 3 components of the direction cosines
73 (cosdiru, cosdirv, cosdirw)
74 */
75
76 G4double cospolang, sinpolang, phi;
77
78 // Choose emission angle isotropically, then select polar angle direction cosine
79 cospolang = 1.-2.*fisslibrng();
80 sinpolang = std::sqrt(1. - cospolang*cospolang);
81
82 // Select an azimuthal angle uniformly on (0,2*pi)
83 phi = twopi*fisslibrng();
84 *cosdiru = sinpolang * std::cos(phi);
85 *cosdirv = sinpolang * std::sin(phi);
86 *cosdirw = cospolang;
87 }
88