geant events for multiple scattering

src/Vtk/HEP/Geant/CMakeLists.txt

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+
+################################################################################
+##### Vtk/HEP/Geant - VTK wrappers for HEP Geant objects #######################
+################################################################################
+
+set(HEP_GEANT_SOURCES
+    ${CMAKE_CURRENT_SOURCE_DIR}/vtkGeantEvent.cpp
+    PARENT_SCOPE)
+
+set(HEP_GEANT_HEADERS
+    ${CMAKE_CURRENT_SOURCE_DIR}/vtkGeantEvent.h
+    PARENT_SCOPE)
+
+if(BUILD_TESTING)
+  include(uLibTargetMacros)
+  add_subdirectory(testing)
+endif()

src/Vtk/HEP/Geant/testing/CMakeLists.txt

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+# TESTS
+set(TESTS
+       vtkGeantEventTest
+)
+
+set(LIBRARIES
+       ${PACKAGE_LIBPREFIX}Core
+       ${PACKAGE_LIBPREFIX}Math
+       ${PACKAGE_LIBPREFIX}Geant
+       ${PACKAGE_LIBPREFIX}Vtk
+       Eigen3::Eigen
+)
+
+uLib_add_tests(VtkGeant)

src/Vtk/HEP/Geant/testing/vtkGeantEventTest.cpp

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+/*//////////////////////////////////////////////////////////////////////////////
+// CMT Cosmic Muon Tomography project //////////////////////////////////////////
+////////////////////////////////////////////////////////////////////////////////
+
+  Copyright (c) 2014, Universita' degli Studi di Padova, INFN sez. di Padova
+  All rights reserved
+
+  Authors: Andrea Rigoni Garola < andrea.rigoni@pd.infn.it >
+
+//////////////////////////////////////////////////////////////////////////////*/
+
+#include "Geant/Solid.h"
+#include "HEP/Geant/GeantEvent.h"
+#include "HEP/Geant/Scene.h"
+#include "HEP/Geant/EmitterPrimary.hh"
+#include "Math/ContainerBox.h"
+#include "Math/Dense.h"
+#include "Vtk/uLibVtkViewer.h"
+#include "Vtk/HEP/Geant/vtkGeantEvent.h"
+#include "Vtk/vtkContainerBox.h"
+
+#include <vtkSmartPointer.h>
+#include <vtkCallbackCommand.h>
+#include <vtkRenderWindowInteractor.h>
+#include <vtkProperty.h>
+#include <vtkRenderer.h>
+#include <vtkRenderWindow.h>
+
+#include <Geant4/Randomize.hh>
+#include <Geant4/G4ParticleGun.hh>
+#include <Geant4/G4SystemOfUnits.hh>
+
+#include <iostream>
+
+using namespace uLib;
+
+// Custom emitter to fire random muons towards the cube
+class RandomEmitter : public Geant::EmitterPrimary {
+public:
+    virtual void GeneratePrimaries(G4Event* anEvent) override {
+        // Start from a random point in a square at z = 5m
+        // Note: unit in Geant4 is mm by default if not specified, 
+        // but here we use the constants from G4SystemOfUnits.h
+        double x = (G4UniformRand() - 0.5) * 2000; // -1m to 1m
+        double y = (G4UniformRand() - 0.5) * 2000; // -1m to 1m
+        double z = 5000.0; // 5m above origin
+        
+        fParticleGun->SetParticlePosition(G4ThreeVector(x, y, z));
+        
+        // Aim at a random point within the cube (which is at origin, size 1m)
+        double tx = (G4UniformRand() - 0.5) * 1000;
+        double ty = (G4UniformRand() - 0.5) * 1000;
+        double tz = (G4UniformRand() - 0.5) * 1000;
+        
+        G4ThreeVector dir(tx - x, ty - y, tz - z);
+        dir = dir.unit();
+        fParticleGun->SetParticleMomentumDirection(dir);
+        
+        fParticleGun->GeneratePrimaryVertex(anEvent);
+    }
+};
+
+struct AppState {
+    Geant::Scene* scene;
+    Vtk::Viewer* viewer;
+    Vector<Geant::GeantEvent> results;
+};
+
+void KeyPressCallbackFunction(vtkObject* caller, long unsigned int eventId, void* clientData, void* callData) {
+    auto* interactor = static_cast<vtkRenderWindowInteractor*>(caller);
+    auto* state = static_cast<AppState*>(clientData);
+    
+    std::string key = interactor->GetKeySym();
+    if (key == "Return") {
+        std::cout << "--> Firing random muon..." << std::endl;
+        
+        // Run one event
+        state->scene->RunSimulation(1, state->results);
+        
+        if (!state->results.empty()) {
+            // Get the last event
+            Geant::GeantEvent* lastEvent = &state->results.back();
+            std::cout << "    Collected event " << lastEvent->GetEventID() 
+                      << " with " << lastEvent->Path().size() << " steps." << std::endl;
+                      
+            // Wrap it for VTK
+            Vtk::vtkGeantEvent* vtkEvent = new Vtk::vtkGeantEvent(lastEvent);
+            state->viewer->AddPuppet(*vtkEvent);
+            
+            // Re-render
+            state->viewer->GetRenderer()->Render();
+            state->viewer->GetRenderWindow()->Render();
+        }
+    }
+}
+
+int main(int argc, char** argv) {
+    // 1. Setup Geant4 Scene
+    ContainerBox world_box(Vector3f(30000, 30000, 30000));
+    Geant::Scene scene;
+    scene.ConstructWorldBox(&world_box, "G4_AIR");
+
+    ContainerBox iron_box(Vector3f(1000, 1000, 1000));
+    Geant::BoxSolid* iron_cube = new Geant::BoxSolid("IronCube", &iron_box);
+    iron_cube->SetNistMaterial("G4_Fe");
+    iron_cube->Update();
+    scene.AddSolid(iron_cube);
+
+    RandomEmitter* emitter = new RandomEmitter();
+    scene.SetEmitter(emitter);
+    scene.Initialize();
+
+    // 2. Setup VTK Viewer
+    Vtk::Viewer viewer;
+    viewer.GetRenderer()->SetBackground(0.05, 0.05, 0.1);
+    
+    // Visualize iron cube
+    Vtk::vtkContainerBox* vtkIron = new Vtk::vtkContainerBox(&iron_box);
+    viewer.AddPuppet(*vtkIron);
+    
+    // 3. Event Handling
+    AppState state = { &scene, &viewer, {} };
+    
+    vtkSmartPointer<vtkCallbackCommand> keyCallback = vtkSmartPointer<vtkCallbackCommand>::New();
+    keyCallback->SetCallback(KeyPressCallbackFunction);
+    keyCallback->SetClientData(&state);
+    
+    viewer.GetInteractor()->AddObserver(vtkCommand::KeyPressEvent, keyCallback);
+
+    std::cout << "=================================================" << std::endl;
+    std::cout << " Geant Muon Simulation Viewer" << std::endl;
+    std::cout << " Press [ENTER] to fire a new random muon" << std::endl;
+    std::cout << " Press [q] to exit" << std::endl;
+    std::cout << "=================================================" << std::endl;
+
+    viewer.ZoomAuto();
+    viewer.Start();
+
+    return 0;
+}

src/Vtk/HEP/Geant/vtkGeantEvent.cpp

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+/*//////////////////////////////////////////////////////////////////////////////
+// CMT Cosmic Muon Tomography project //////////////////////////////////////////
+////////////////////////////////////////////////////////////////////////////////
+
+  Copyright (c) 2014, Universita' degli Studi di Padova, INFN sez. di Padova
+  All rights reserved
+
+  Authors: Andrea Rigoni Garola < andrea.rigoni@pd.infn.it >
+
+  ------------------------------------------------------------------
+  This library is free software;  you  can  redistribute  it  and/or
+  modify it  under the  terms  of  the  GNU  Lesser  General  Public
+  License as published  by  the  Free  Software  Foundation;  either
+  version 3.0 of the License, or (at your option) any later version.
+
+  This library is  distributed in  the hope that it will  be useful,
+  but  WITHOUT ANY WARRANTY;  without  even  the implied warranty of
+  MERCHANTABILITY  or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+  Lesser General Public License for more details.
+
+  You should have received a copy of  the GNU Lesser General  Public
+  License along with this library.
+
+//////////////////////////////////////////////////////////////////////////////*/
+
+#include "vtkGeantEvent.h"
+
+#include <vtkPolyData.h>
+#include <vtkPoints.h>
+#include <vtkCellArray.h>
+#include <vtkPolyDataMapper.h>
+#include <vtkProperty.h>
+#include <vtkSmartPointer.h>
+
+namespace uLib {
+namespace Vtk {
+
+vtkGeantEvent::vtkGeantEvent(Content *content)
+    : m_MuonPath(vtkActor::New()), m_Content(content) {
+  this->InstallPipe();
+  this->Update();
+}
+
+vtkGeantEvent::~vtkGeantEvent() {
+  m_MuonPath->Delete();
+}
+
+vtkPolyData *vtkGeantEvent::GetPolyData() const {
+  if (!m_MuonPath || !m_MuonPath->GetMapper())
+    return NULL;
+  return vtkPolyData::SafeDownCast(m_MuonPath->GetMapper()->GetInput());
+}
+
+void vtkGeantEvent::Update() {
+  if (!m_Content)
+    return;
+
+  vtkSmartPointer<vtkPoints> points = vtkSmartPointer<vtkPoints>::New();
+  vtkSmartPointer<vtkCellArray> lines = vtkSmartPointer<vtkCellArray>::New();
+
+  const HLine3f &gen = m_Content->GenVector();
+  const Vector<Geant::GeantEvent::Delta> &path = m_Content->Path();
+
+  // Start point from generation vector
+  Vector3f currentPos(gen.origin(0), gen.origin(1), gen.origin(2));
+  points->InsertNextPoint(currentPos(0), currentPos(1), currentPos(2));
+
+  for (size_t i = 0; i < path.size(); ++i) {
+    const Geant::GeantEvent::Delta &delta = path[i];
+    
+    // P_{i+1} = P_i + Length * Direction
+    // Note: HVector3f is stored as (x,y,z,0) in HPoint3f template
+    Vector3f dir(delta.Direction()(0), delta.Direction()(1), delta.Direction()(2));
+    currentPos += delta.GetLength() * dir;
+    
+    points->InsertNextPoint(currentPos(0), currentPos(1), currentPos(2));
+
+    vtkIdType line[2] = {static_cast<vtkIdType>(i),
+                          static_cast<vtkIdType>(i + 1)};
+    lines->InsertNextCell(2, line);
+  }
+
+  vtkPolyData *polyData = GetPolyData();
+  if (polyData) {
+    polyData->SetPoints(points);
+    polyData->SetLines(lines);
+    polyData->Modified();
+  }
+}
+
+void vtkGeantEvent::InstallPipe() {
+  vtkSmartPointer<vtkPolyData> polyData = vtkSmartPointer<vtkPolyData>::New();
+  vtkSmartPointer<vtkPolyDataMapper> mapper =
+      vtkSmartPointer<vtkPolyDataMapper>::New();
+  mapper->SetInputData(polyData);
+
+  m_MuonPath->SetMapper(mapper);
+  
+  // Set default look: Red line
+  m_MuonPath->GetProperty()->SetColor(1.0, 0.0, 0.0);
+  m_MuonPath->GetProperty()->SetLineWidth(2.0);
+  m_MuonPath->GetProperty()->SetAmbient(1.0);
+
+  this->SetProp(m_MuonPath);
+}
+
+} // namespace Vtk
+} // namespace uLib

src/Vtk/HEP/Geant/vtkGeantEvent.h

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+/*//////////////////////////////////////////////////////////////////////////////
+// CMT Cosmic Muon Tomography project //////////////////////////////////////////
+////////////////////////////////////////////////////////////////////////////////
+
+  Copyright (c) 2014, Universita' degli Studi di Padova, INFN sez. di Padova
+  All rights reserved
+
+  Authors: Andrea Rigoni Garola < andrea.rigoni@pd.infn.it >
+
+  ------------------------------------------------------------------
+  This library is free software;  you  can  redistribute  it  and/or
+  modify it  under the  terms  of  the  GNU  Lesser  General  Public
+  License as published  by  the  Free  Software  Foundation;  either
+  version 3.0 of the License, or (at your option) any later version.
+
+  This library is  distributed in  the hope that it will  be useful,
+  but  WITHOUT ANY WARRANTY;  without  even  the implied warranty of
+  MERCHANTABILITY  or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+  Lesser General Public License for more details.
+
+  You should have received a copy of  the GNU Lesser General  Public
+  License along with this library.
+
+//////////////////////////////////////////////////////////////////////////////*/
+
+#ifndef U_VTKGEANTEVENT_H
+#define U_VTKGEANTEVENT_H
+
+#include "HEP/Geant/GeantEvent.h"
+#include "uLibVtkInterface.h"
+#include <vtkActor.h>
+
+namespace uLib {
+namespace Vtk {
+
+class vtkGeantEvent : public Puppet, public Polydata {
+  typedef Geant::GeantEvent Content;
+
+public:
+  vtkGeantEvent(Content *content);
+  ~vtkGeantEvent();
+
+  virtual class vtkPolyData *GetPolyData() const override;
+
+  virtual void Update();
+
+protected:
+  virtual void InstallPipe();
+
+  vtkActor *m_MuonPath;
+  Content *m_Content;
+};
+
+} // namespace Vtk
+} // namespace uLib
+
+#endif // U_VTKGEANTEVENT_H