Import Geant4 10.0.0 source tree

source/processes/hadronic/models/fission/src/G4SmpIsoDir.cc

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+//
+// ********************************************************************
+// * License and Disclaimer                                           *
+// *                                                                  *
+// * The  Geant4 software  is  copyright of the Copyright Holders  of *
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+// *                                                                  *
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+// *                                                                  *
+// * 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 *
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+// ********************************************************************
+//
+//
+// This software was developed by Lawrence Livermore National Laboratory.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are met:
+//
+// 1. Redistributions of source code must retain the above copyright notice,
+//   this list of conditions and the following disclaimer.
+// 2. Redistributions in binary form must reproduce the above copyright notice,
+//   this list of conditions and the following disclaimer in the documentation
+//   and/or other materials provided with the distribution.
+// 3. The name of the author may not be used to endorse or promote products
+//   derived from this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
+// WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+// MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
+// EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
+// OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+// WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
+// OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+// ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+//
+// Copyright (c) 2006 The Regents of the University of California.
+// All rights reserved.
+// UCRL-CODE-224807
+//
+//
+// $Id: G4SmpIsoDir.cc 67966 2013-03-13 09:38:38Z gcosmo $
+//
+
+#include <cmath>
+#include "G4fissionEvent.hh"
+#include "G4PhysicalConstants.hh"
+
+void G4fissionEvent::G4SmpIsoDir(G4double* cosdiru, G4double* cosdirv, G4double* cosdirw) {
+
+/*
+  Description
+    determine the 3 direction cosines of a particle emitted isotropically
+*/
+
+/*
+  Input
+  Output
+            - 3 components of the direction cosines
+              (cosdiru, cosdirv, cosdirw)
+*/
+
+   G4double cospolang, sinpolang, phi;
+
+/*
+   Choose emission angle isotropically.
+   Select a polar angle direction cosine.
+*/
+   cospolang = 1.-2.*fisslibrng();
+   sinpolang = std::sqrt(1.-std::pow(cospolang, 2.));
+/*
+   Select an azimuthal angle uniformly on (0,2*pi)
+*/
+   phi = twopi*fisslibrng();
+   *cosdiru = sinpolang * std::cos(phi);
+   *cosdirv = sinpolang * std::sin(phi);
+   *cosdirw = cospolang;
+}