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This commit is contained in:
Gabriele Cosmo
2016-06-30 14:12:05 +02:00
parent a654a7ab1f
commit 4ec577e5c4
2021 changed files with 100995 additions and 78277 deletions
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source/global/HEPRandom/include/G4RandomDirection.hh
+6 -8
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@@ -24,7 +24,7 @@
// ********************************************************************
//
//
// $Id: G4RandomDirection.hh 67970 2013-03-13 10:10:06Z gcosmo $
// $Id: G4RandomDirection.hh 96120 2016-03-16 20:29:21Z gcosmo $
//
//
// ------------------------------------------------------------
@@ -39,6 +39,7 @@
// providing more performant results.
// History:
// 15.03.16 E. Tcherniaev, removed unnecessary if and unit()
// 18.03.08 V. Grichine, unit radius sphere surface based algorithm
// ~ 2007 M. Kossov, algorithm based on 8 Quadrants technique
//
@@ -54,13 +55,10 @@
inline G4ThreeVector G4RandomDirection()
{
G4double cosTheta = 2.*G4UniformRand()-1.;
G4double sinTheta2 = 1. - cosTheta*cosTheta;
if( sinTheta2 < 0.) sinTheta2 = 0.;
G4double sinTheta = std::sqrt(sinTheta2);
G4double phi = CLHEP::twopi*G4UniformRand();
return G4ThreeVector(sinTheta*std::cos(phi),
sinTheta*std::sin(phi), cosTheta).unit();
G4double z = 2.*G4UniformRand() - 1.; // z = cos(theta)
G4double rho = std::sqrt((1.+z)*(1.-z)); // rho = sqrt(1-z*z)
G4double phi = CLHEP::twopi*G4UniformRand();
return G4ThreeVector(rho*std::cos(phi), rho*std::sin(phi), z);
}
#endif /* G4RANDOMDIR_HH */