Import Geant4 9.2.0 source tree

2016-06-09 15:58:43 +02:00
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+//
+// ********************************************************************
+// * License and Disclaimer                                           *
+// *                                                                  *
+// * The  Geant4 software  is  copyright of the Copyright Holders  of *
+// * the Geant4 Collaboration.  It is provided  under  the terms  and *
+// * conditions of the Geant4 Software License,  included in the file *
+// * LICENSE and available at  http://cern.ch/geant4/license .  These *
+// * include a list of copyright holders.                             *
+// *                                                                  *
+// * Neither the authors of this software system, nor their employing *
+// * institutes,nor the agencies providing financial support for this *
+// * work  make  any representation or  warranty, express or implied, *
+// * regarding  this  software system or assume any liability for its *
+// * use.  Please see the license in the file  LICENSE  and URL above *
+// * for the full disclaimer and the limitation of liability.         *
+// *                                                                  *
+// * This  code  implementation is the result of  the  scientific and *
+// * technical work of the GEANT4 collaboration.                      *
+// * By using,  copying,  modifying or  distributing the software (or *
+// * any work based  on the software)  you  agree  to acknowledge its *
+// * use  in  resulting  scientific  publications,  and indicate your *
+// * acceptance of all terms of the Geant4 Software license.          *
+// ********************************************************************
+//
+//
+// $Id: G4RandomTools.hh,v 1.2 2008/11/07 17:54:21 gum Exp $
+// GEANT4 tag $Name: geant4-09-02 $
+//
+// 
+// ---------------------------------------------------------------------------
+//      GEANT 4 class header file 
+// ---------------------------------------------------------------------------
+// Class description:
+//
+// Utility functions 
+
+// History:
+//
+// 07.11.08 - P.Gumplinger, based on implementation in G4OpBoundaryProcess
+//
+// ---------------------------------------------------------------------------
+
+#ifndef G4RANDOMTOOLS_HH
+#define G4RANDOMTOOLS_HH
+
+#include "globals.hh"
+#include "Randomize.hh"
+#include "G4RandomDirection.hh"
+
+// ---------------------------------------------------------------------------
+// Returns a random lambertian unit vector
+//
+inline G4ThreeVector G4LambertianRand(const G4ThreeVector& normal)
+{
+  G4ThreeVector vect;
+  G4double ndotv;
+
+  do
+  {
+    vect = G4RandomDirection();
+    ndotv = normal * vect;
+
+    if (ndotv < 0.0)
+    {
+      vect = -vect;
+      ndotv = -ndotv;
+    }
+
+  } while (!(G4UniformRand() < ndotv));
+
+  return vect;
+}
+
+// ---------------------------------------------------------------------------
+// Chooses a random vector within a plane given by the unit normal
+//
+inline G4ThreeVector G4PlaneVectorRand(const G4ThreeVector& normal)
+{
+  G4ThreeVector vec1 = normal.orthogonal();
+  G4ThreeVector vec2 = vec1.cross(normal);
+
+  G4double phi = twopi*G4UniformRand();
+  G4double cosphi = std::cos(phi);
+  G4double sinphi = std::sin(phi);
+
+  return cosphi * vec1 + sinphi * vec2;
+}
+
+#endif  /* G4RANDOMTOOLS_HH */