Import Geant4 11.0.0.beta source tree

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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.          *
+// ********************************************************************
+//
+/// \file persistency/gdml/G01/include/VG01PrimaryGeneratorAction.hh
+/// \brief Generator with multiple modes: uniform, free, axis, fixed)
+//
+//  Primary generator that can be configured using modes to either:
+//    - 'uniform' direction secondaries       (default)
+//    - 'free'    which is configured by UI - initialised in con/tor
+//    - 'axis'    directing secondaries by rotation to x, y & z axis
+//    - 'fixed'   along x axis, and near it ( y = 0.1 or z = 0.1)
+// 
+//  Authors: J. Apostolakis & S. Wenzel (CERN)  2018-2021
+//
+//  Started from FullCMS code by Mihaly Novak (CERN) 2017  
+
+#ifndef _G01PRIMARYGENERATORACTION_H_
+#define _G01PRIMARYGENERATORACTION_H_
+
+#include "G4VUserPrimaryGeneratorAction.hh"
+
+#include "globals.hh"
+
+class G4Event;
+class G4ParticleGun;
+
+/// Configurable primary generator action to demonstrate use of 
+///   VecGeom Navigation
+
+class VG01PrimaryGeneratorAction : public G4VUserPrimaryGeneratorAction
+{
+
+  public:
+   enum EGeneratorMode { kFixedMode, kUniformMode, kAxisMode,  kFreeMode};
+  //                     x Axis       random dir    x, y, z     UI directed
+
+    VG01PrimaryGeneratorAction( EGeneratorMode mode = kUniformMode );
+   ~VG01PrimaryGeneratorAction();
+
+   void GeneratePrimaries(G4Event* anEvent) override;
+
+   void SetGeneratorMode(EGeneratorMode val) { fMode = val;} 
+   EGeneratorMode GetGeneratorMode() { return fMode;}
+  private:
+
+    G4ParticleGun* fParticleGun;
+    EGeneratorMode  fMode;
+};
+
+#endif