| 1 | //
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| 2 | // ********************************************************************
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| 3 | // * License and Disclaimer *
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| 4 | // * *
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| 5 | // * The Geant4 software is copyright of the Copyright Holders of *
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| 6 | // * the Geant4 Collaboration. It is provided under the terms and *
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| 7 | // * conditions of the Geant4 Software License, included in the file *
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| 8 | // * LICENSE and available at http://cern.ch/geant4/license . These *
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| 9 | // * include a list of copyright holders. *
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| 10 | // * *
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| 11 | // * Neither the authors of this software system, nor their employing *
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| 12 | // * institutes,nor the agencies providing financial support for this *
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| 13 | // * work make any representation or warranty, express or implied, *
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| 14 | // * regarding this software system or assume any liability for its *
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| 15 | // * use. Please see the license in the file LICENSE and URL above *
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| 16 | // * for the full disclaimer and the limitation of liability. *
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| 17 | // * *
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| 18 | // * This code implementation is the result of the scientific and *
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| 19 | // * technical work of the GEANT4 collaboration. *
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| 20 | // * By using, copying, modifying or distributing the software (or *
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| 21 | // * any work based on the software) you agree to acknowledge its *
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| 22 | // * use in resulting scientific publications, and indicate your *
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| 23 | // * acceptance of all terms of the Geant4 Software license. *
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| 24 | // ********************************************************************
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| 25 | //
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| 26 | //
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| 27 | // This software was developed by Lawrence Livermore National Laboratory.
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| 28 | //
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| 29 | // Redistribution and use in source and binary forms, with or without
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| 30 | // modification, are permitted provided that the following conditions are met:
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| 31 | //
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| 32 | // 1. Redistributions of source code must retain the above copyright notice,
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| 33 | // this list of conditions and the following disclaimer.
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| 34 | // 2. Redistributions in binary form must reproduce the above copyright notice,
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| 35 | // this list of conditions and the following disclaimer in the documentation
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| 36 | // and/or other materials provided with the distribution.
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| 37 | // 3. The name of the author may not be used to endorse or promote products
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| 38 | // derived from this software without specific prior written permission.
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| 39 | //
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| 40 | // THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
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| 41 | // WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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| 42 | // MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
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| 43 | // EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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| 44 | // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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| 45 | // PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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| 46 | // OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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| 47 | // WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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| 48 | // OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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| 49 | // ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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| 50 | //
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| 51 | // Copyright (c) 2006 The Regents of the University of California.
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| 52 | // All rights reserved.
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| 53 | // UCRL-CODE-224807
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| 54 | //
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| 55 | //
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| 56 | // $Id: G4SmpIsoDir.cc,v 1.3 2007/06/01 13:46:53 gcosmo Exp $
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| 57 | //
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| 58 |
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| 59 | #include <cmath>
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| 60 | #include "G4fissionEvent.hh"
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| 61 |
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| 62 | void G4fissionEvent::G4SmpIsoDir(G4double* cosdiru, G4double* cosdirv, G4double* cosdirw) {
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| 63 |
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| 64 | /*
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| 65 | Description
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| 66 | determine the 3 direction cosines of a particle emitted isotropically
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| 67 | */
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| 68 |
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| 69 | /*
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| 70 | Input
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| 71 | Output
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| 72 | - 3 components of the direction cosines
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| 73 | (cosdiru, cosdirv, cosdirw)
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| 74 | */
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| 75 |
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| 76 | G4double cospolang, sinpolang, phi;
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| 77 |
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| 78 | /*
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| 79 | Choose emission angle isotropically.
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| 80 | Select a polar angle direction cosine.
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| 81 | */
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| 82 | cospolang = 1.-2.*fisslibrng();
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| 83 | sinpolang = std::sqrt(1.-std::pow(cospolang, 2.));
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| 84 | /*
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| 85 | Select an azimuthal angle uniformly on (0,2*pi)
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| 86 | */
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| 87 | phi = twopi*fisslibrng();
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| 88 | *cosdiru = sinpolang * std::cos(phi);
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| 89 | *cosdirv = sinpolang * std::sin(phi);
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| 90 | *cosdirw = cospolang;
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| 91 | }
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