G4SmpIsoDir.cc

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00051 // Copyright (c) 2006 The Regents of the University of California.
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00053 // UCRL-CODE-224807
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00055 //
00056 // $Id: G4SmpIsoDir.cc 69860 2013-05-16 14:39:02Z gcosmo $
00057 //
00058 
00059 #include <cmath>
00060 #include "G4fissionEvent.hh"
00061 #include "G4PhysicalConstants.hh"
00062 
00063 void G4fissionEvent::G4SmpIsoDir(G4double* cosdiru, G4double* cosdirv, G4double* cosdirw) {
00064 
00065 /*
00066   Description
00067     determine the 3 direction cosines of a particle emitted isotropically
00068 */
00069 
00070 /*
00071   Input
00072   Output
00073             - 3 components of the direction cosines
00074               (cosdiru, cosdirv, cosdirw)
00075 */
00076 
00077    G4double cospolang, sinpolang, phi;
00078 
00079 /*
00080    Choose emission angle isotropically.
00081    Select a polar angle direction cosine.
00082 */
00083    cospolang = 1.-2.*fisslibrng();
00084    sinpolang = std::sqrt(1.-std::pow(cospolang, 2.));
00085 /*
00086    Select an azimuthal angle uniformly on (0,2*pi)
00087 */
00088    phi = twopi*fisslibrng();
00089    *cosdiru = sinpolang * std::cos(phi);
00090    *cosdirv = sinpolang * std::sin(phi);
00091    *cosdirw = cospolang;
00092 }

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