add vtk geant solid and scene

src/HEP/Geant/Scene.cpp

@@ -102,6 +102,7 @@ void Scene::AddSolid(Solid *solid, Solid *parent) {
 
 const Solid* Scene::GetWorld() const { return d->m_World; }
 ContainerBox* Scene::GetWorldBox() const { return &d->m_WorldBox; }
+const Vector<Solid*>& Scene::GetSolids() const { return d->m_Solids; }
 
 void Scene::ConstructWorldBox(const Vector3f &size, const char *material) {
   d->m_WorldBox.Scale(size);

src/HEP/Geant/Scene.h

@@ -58,6 +58,9 @@ public:
   
   ContainerBox* GetWorldBox() const;
 
+  /// Get the list of solids in the scene
+  const Vector<Solid*>& GetSolids() const;
+
   /// Set the primary generator (emitter) for the simulation.
   /// The Scene does NOT take ownership of the emitter.
   void SetEmitter(EmitterPrimary *emitter);

src/Vtk/HEP/Geant/CMakeLists.txt

@@ -5,11 +5,15 @@
 
 set(HEP_GEANT_SOURCES
     ${CMAKE_CURRENT_SOURCE_DIR}/vtkGeantEvent.cpp
+    ${CMAKE_CURRENT_SOURCE_DIR}/vtkGeantSolid.cpp
+    ${CMAKE_CURRENT_SOURCE_DIR}/vtkGeantScene.cpp
     ${CMAKE_CURRENT_SOURCE_DIR}/vtkEmitterPrimary.cpp
     PARENT_SCOPE)
 
 set(HEP_GEANT_HEADERS
     ${CMAKE_CURRENT_SOURCE_DIR}/vtkGeantEvent.h
+    ${CMAKE_CURRENT_SOURCE_DIR}/vtkGeantSolid.h
+    ${CMAKE_CURRENT_SOURCE_DIR}/vtkGeantScene.h
     ${CMAKE_CURRENT_SOURCE_DIR}/vtkEmitterPrimary.h
     PARENT_SCOPE)
 

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

@@ -1,6 +1,7 @@
 # TESTS
 set(TESTS
        vtkGeantEventTest
+       vtkGeantSceneTest
        vtkEmitterPrimaryTest
        vtkSkyPlaneEmitterPrimaryTest
        vtkCylinderEmitterPrimaryTest

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

@@ -0,0 +1,65 @@
+/*//////////////////////////////////////////////////////////////////////////////
+// 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/Scene.h"
+#include "Math/ContainerBox.h"
+#include "Math/Dense.h"
+#include "Math/Units.h"
+#include "Vtk/uLibVtkViewer.h"
+#include "Vtk/HEP/Geant/vtkGeantScene.h"
+
+#include <vtkSmartPointer.h>
+#include <vtkRenderer.h>
+#include <vtkRenderWindow.h>
+
+#include <iostream>
+
+using namespace uLib;
+
+int main(int argc, char** argv) {
+    bool interactive = (argc > 1 && std::string(argv[1]) == "-i");
+
+    // 1. Setup Geant4 Scene
+    Geant::Scene scene;
+    scene.ConstructWorldBox(Vector3f(30_m, 30_m, 30_m), "G4_AIR");
+
+    // Add an iron cube inside the world
+    ContainerBox iron_box;
+    iron_box.Scale(Vector3f(10_m, 10_m, 10_m));
+    iron_box.SetPosition(Vector3f(-5_m, -5_m, -5_m));
+    Geant::BoxSolid* iron_cube = new Geant::BoxSolid("IronCube", &iron_box);
+    iron_cube->SetNistMaterial("G4_Fe");
+    iron_cube->Update();
+    scene.AddSolid(iron_cube);
+    scene.Initialize();
+
+    // 2. Build VTK scene representation
+    Vtk::Viewer viewer;
+    viewer.GetRenderer()->SetBackground(0.05, 0.05, 0.1);
+
+    Vtk::vtkGeantScene vtkScene(&scene);
+    vtkScene.AddToViewer(viewer);
+
+    std::cout << "==================================================" << std::endl;
+    std::cout << " vtkGeantScene Test" << std::endl;
+    std::cout << " World box + 1 iron cube displayed" << std::endl;
+    std::cout << "==================================================" << std::endl;
+
+    if (interactive) {
+        viewer.ZoomAuto();
+        viewer.Start();
+    } else {
+        std::cout << "Non-interactive test: scene initialized successfully" << std::endl;
+    }
+
+    return 0;
+}

src/Vtk/HEP/Geant/vtkGeantScene.cpp

@@ -0,0 +1,89 @@
+/*//////////////////////////////////////////////////////////////////////////////
+// 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 "vtkGeantScene.h"
+#include "vtkGeantSolid.h"
+#include "Vtk/vtkViewport.h"
+
+namespace uLib {
+namespace Vtk {
+
+vtkGeantScene::vtkGeantScene(Geant::Scene *scene)
+    : m_Scene(scene), m_WorldPuppet(nullptr) {
+  if (!m_Scene)
+    return;
+
+  // 1. Create the world box wireframe puppet
+  ContainerBox *worldBox = m_Scene->GetWorldBox();
+  if (worldBox) {
+    m_WorldPuppet = new vtkContainerBox(worldBox);
+    m_WorldPuppet->SetRepresentation(Puppet::Wireframe);
+    m_WorldPuppet->ShowScaleMeasures(true);
+  }
+
+  // 2. Create puppets for each non-world solid
+  const Geant::Solid *world = m_Scene->GetWorld();
+  const Vector<Geant::Solid *> &solids = m_Scene->GetSolids();
+
+  for (Geant::Solid *solid : solids) {
+    // Skip the world volume itself — it's already shown as the wireframe box
+    if (solid == world)
+      continue;
+
+    // Only create a puppet if the solid has a valid G4VSolid
+    if (solid->GetG4Solid()) {
+      vtkGeantSolid *vtkSolid = new vtkGeantSolid(solid);
+      m_SolidPuppets.push_back(vtkSolid);
+    }
+  }
+}
+
+vtkGeantScene::~vtkGeantScene() {
+  delete m_WorldPuppet;
+  for (auto *p : m_SolidPuppets) {
+    delete p;
+  }
+}
+
+void vtkGeantScene::AddToViewer(Viewport &viewer) {
+  if (m_WorldPuppet) {
+    viewer.AddPuppet(*m_WorldPuppet);
+  }
+  for (auto *p : m_SolidPuppets) {
+    viewer.AddPuppet(*p);
+  }
+}
+
+void vtkGeantScene::RemoveFromViewer(Viewport &viewer) {
+  if (m_WorldPuppet) {
+    viewer.RemovePuppet(*m_WorldPuppet);
+  }
+  for (auto *p : m_SolidPuppets) {
+    viewer.RemovePuppet(*p);
+  }
+}
+
+} // namespace Vtk
+} // namespace uLib

src/Vtk/HEP/Geant/vtkGeantScene.h

@@ -0,0 +1,87 @@
+/*//////////////////////////////////////////////////////////////////////////////
+// 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_VTKGEANTSCENE_H
+#define U_VTKGEANTSCENE_H
+
+#include "HEP/Geant/Scene.h"
+#include "uLibVtkInterface.h"
+#include "Vtk/Math/vtkContainerBox.h"
+
+#include <vector>
+#include <memory>
+
+namespace uLib {
+namespace Vtk {
+
+class vtkGeantSolid;
+
+/**
+ * @brief VTK Puppet representing the entire Geant::Scene.
+ *
+ * When constructed, it creates child puppets for the world box (as a
+ * vtkContainerBox wireframe) and for each non-world Solid in the scene
+ * (as vtkGeantSolid surfaces).
+ *
+ * Usage:
+ * @code
+ *   Geant::Scene scene;
+ *   scene.ConstructWorldBox(Vector3f(30_m, 30_m, 30_m), "G4_AIR");
+ *   // ... add solids ...
+ *   scene.Initialize();
+ *
+ *   Vtk::Viewer viewer;
+ *   Vtk::vtkGeantScene vtkScene(&scene);
+ *   vtkScene.AddToViewer(viewer);
+ *   viewer.Start();
+ * @endcode
+ */
+class vtkGeantScene : public Object {
+public:
+  vtkGeantScene(Geant::Scene *scene);
+  ~vtkGeantScene();
+
+  /// Add all puppets (world box + solids) to a viewer.
+  void AddToViewer(class Viewport &viewer);
+
+  /// Remove all puppets from viewport.
+  void RemoveFromViewer(class Viewport &viewer);
+
+  /// Get the world box puppet 
+  vtkContainerBox* GetWorldPuppet() const { return m_WorldPuppet; }
+
+  /// Get the solid puppets
+  const std::vector<vtkGeantSolid*>& GetSolidPuppets() const { return m_SolidPuppets; }
+
+private:
+  Geant::Scene             *m_Scene;
+  vtkContainerBox          *m_WorldPuppet;
+  std::vector<vtkGeantSolid*> m_SolidPuppets;
+};
+
+} // namespace Vtk
+} // namespace uLib
+
+#endif // U_VTKGEANTSCENE_H

src/Vtk/HEP/Geant/vtkGeantSolid.cpp

@@ -0,0 +1,156 @@
+/*//////////////////////////////////////////////////////////////////////////////
+// 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 "vtkGeantSolid.h"
+
+#include <vtkActor.h>
+#include <vtkPolyData.h>
+#include <vtkPoints.h>
+#include <vtkCellArray.h>
+#include <vtkPolyDataMapper.h>
+#include <vtkProperty.h>
+#include <vtkSmartPointer.h>
+#include <vtkTransform.h>
+#include <vtkMatrix4x4.h>
+
+#include <Geant4/G4VSolid.hh>
+#include <Geant4/G4Polyhedron.hh>
+#include <Geant4/G4VPhysicalVolume.hh>
+
+namespace uLib {
+namespace Vtk {
+
+vtkGeantSolid::vtkGeantSolid(Content *content)
+    : m_SolidActor(vtkActor::New()), m_Content(content) {
+  this->InstallPipe();
+  this->Update();
+}
+
+vtkGeantSolid::~vtkGeantSolid() {
+  m_SolidActor->Delete();
+}
+
+vtkPolyData *vtkGeantSolid::GetPolyData() const {
+  if (!m_SolidActor || !m_SolidActor->GetMapper())
+    return NULL;
+  return vtkPolyData::SafeDownCast(m_SolidActor->GetMapper()->GetInput());
+}
+
+void vtkGeantSolid::Update() {
+  if (!m_Content)
+    return;
+
+  G4VSolid *g4solid = m_Content->GetG4Solid();
+  if (!g4solid)
+    return;
+
+  // Get the polyhedron tessellation from Geant4
+  G4Polyhedron *polyhedron = g4solid->GetPolyhedron();
+  if (!polyhedron)
+    return;
+
+  vtkSmartPointer<vtkPoints> points = vtkSmartPointer<vtkPoints>::New();
+  vtkSmartPointer<vtkCellArray> polys = vtkSmartPointer<vtkCellArray>::New();
+
+  // Extract vertices
+  int nVertices = polyhedron->GetNoVertices();
+  for (int i = 1; i <= nVertices; ++i) {
+    G4Point3D vtx = polyhedron->GetVertex(i);
+    points->InsertNextPoint(vtx.x(), vtx.y(), vtx.z());
+  }
+
+  // Extract facets (polygons)
+  int nFacets = polyhedron->GetNoFacets();
+  for (int f = 1; f <= nFacets; ++f) {
+    G4int nEdges;
+    G4int iVertex[4]; // G4Polyhedron facets have at most 4 vertices
+    // GetNextFacet returns edges; for quads nEdges=4, for triangles nEdges=3
+    polyhedron->GetFacet(f, nEdges, iVertex);
+
+    vtkIdType ids[4];
+    for (int e = 0; e < nEdges; ++e) {
+      // G4Polyhedron vertices are 1-indexed; VTK expects 0-indexed
+      ids[e] = static_cast<vtkIdType>(std::abs(iVertex[e]) - 1);
+    }
+    polys->InsertNextCell(nEdges, ids);
+  }
+
+  vtkPolyData *polyData = GetPolyData();
+  if (polyData) {
+    polyData->SetPoints(points);
+    polyData->SetPolys(polys);
+    polyData->Modified();
+  }
+
+  // Apply the Geant4 transform (position/rotation) if placed
+  if (m_Content->GetPhysical()) {
+    auto *phys = m_Content->GetPhysical();
+    G4ThreeVector pos = phys->GetTranslation();
+    const G4RotationMatrix *rot = phys->GetRotation();
+
+    vtkSmartPointer<vtkTransform> transform = vtkSmartPointer<vtkTransform>::New();
+    transform->Identity();
+    transform->Translate(pos.x(), pos.y(), pos.z());
+
+    if (rot) {
+      // G4RotationMatrix stores the inverse of the rotation for placement
+      G4RotationMatrix invRot = rot->inverse();
+      double elements[16] = {
+        invRot.xx(), invRot.xy(), invRot.xz(), 0,
+        invRot.yx(), invRot.yy(), invRot.yz(), 0,
+        invRot.zx(), invRot.zy(), invRot.zz(), 0,
+        0, 0, 0, 1
+      };
+      vtkSmartPointer<vtkMatrix4x4> mat = vtkSmartPointer<vtkMatrix4x4>::New();
+      mat->DeepCopy(elements);
+      transform->Concatenate(mat);
+    }
+
+    m_SolidActor->SetUserTransform(transform);
+  }
+}
+
+void vtkGeantSolid::InstallPipe() {
+  vtkSmartPointer<vtkPolyData> polyData = vtkSmartPointer<vtkPolyData>::New();
+  vtkSmartPointer<vtkPolyDataMapper> mapper =
+      vtkSmartPointer<vtkPolyDataMapper>::New();
+  mapper->SetInputData(polyData);
+
+  m_SolidActor->SetMapper(mapper);
+
+  // Default look: semi-transparent blue surface
+  m_SolidActor->GetProperty()->SetColor(0.4, 0.6, 0.9);
+  m_SolidActor->GetProperty()->SetOpacity(0.3);
+  m_SolidActor->GetProperty()->SetAmbient(0.5);
+  m_SolidActor->GetProperty()->SetDiffuse(0.6);
+  m_SolidActor->GetProperty()->SetSpecular(0.2);
+  m_SolidActor->GetProperty()->SetEdgeVisibility(1);
+  m_SolidActor->GetProperty()->SetEdgeColor(0.2, 0.3, 0.5);
+
+  this->SetProp(m_SolidActor);
+}
+
+} // namespace Vtk
+} // namespace uLib

src/Vtk/HEP/Geant/vtkGeantSolid.h

@@ -0,0 +1,66 @@
+/*//////////////////////////////////////////////////////////////////////////////
+// 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_VTKGEANTSOLID_H
+#define U_VTKGEANTSOLID_H
+
+#include "HEP/Geant/Solid.h"
+#include "uLibVtkInterface.h"
+#include "vtkPolydata.h"
+
+class vtkActor;
+
+namespace uLib {
+namespace Vtk {
+
+/**
+ * @brief VTK Puppet for visualizing a Geant::Solid.
+ *
+ * Renders the G4VSolid geometry as a tessellated polydata surface.
+ * Works with BoxSolid, TessellatedSolid, or any Solid that provides
+ * a valid G4VSolid via GetG4Solid().
+ */
+class vtkGeantSolid : public Puppet, public Polydata {
+  typedef Geant::Solid Content;
+
+public:
+  vtkGeantSolid(Content *content);
+  ~vtkGeantSolid();
+
+  virtual class vtkPolyData *GetPolyData() const override;
+
+  virtual void Update();
+
+protected:
+  virtual void InstallPipe();
+
+  vtkActor *m_SolidActor;
+  Content  *m_Content;
+};
+
+} // namespace Vtk
+} // namespace uLib
+
+#endif // U_VTKGEANTSOLID_H

src/Vtk/Math/vtkContainerBox.cpp

@@ -48,13 +48,11 @@ namespace uLib {
 namespace Vtk {
 
 struct ContainerBoxData {
-  vtkActor *m_Cube;
-  vtkActor *m_Axes;
+  vtkSmartPointer<vtkActor> m_Cube;
+  vtkSmartPointer<vtkActor> m_Axes;
 
-  ContainerBoxData() : m_Cube(vtkActor::New()), m_Axes(vtkActor::New()) {}
+  ContainerBoxData() : m_Cube(vtkSmartPointer<vtkActor>::New()), m_Axes(vtkSmartPointer<vtkActor>::New()) {}
   ~ContainerBoxData() {
-    m_Cube->Delete();
-    m_Axes->Delete();
   }
 };
 

src/Vtk/testing/vtkHandlerWidget.cpp

@@ -46,13 +46,14 @@ int main() {
   box.Scale(Vector3f(2.0, 3.0, 4.0));
   box.SetPosition(Vector3f(1.0, 1.0, 1.0));
 
+  // 3. Setup the Viewer
+  Vtk::Viewer viewer;
+
   // 2. Wrap it in a Vtk::vtkContainerBox (Vtk Puppet)
   Vtk::vtkContainerBox v_box(&box);
   v_box.SetRepresentation(Vtk::Puppet::Surface);
   v_box.SetOpacity(0.5);
 
-  // 3. Setup the Viewer
-  Vtk::Viewer viewer;
   viewer.AddPuppet(v_box);
 
   // 4. Create and setup the vtkHandlerWidget
@@ -112,5 +113,6 @@ int main() {
               << std::endl;
   }
 
+  handler->EnabledOff();
   END_TESTING;
 }

src/Vtk/uLibVtkViewer.cpp

@@ -84,6 +84,13 @@ Viewer::Viewer()
 }
 
 Viewer::~Viewer() {
+  this->DisableHandler();
+  if (this->GetRenderWindow()) {
+      this->GetRenderWindow()->RemoveAllObservers();
+  }
+  if (this->GetInteractor()) {
+      this->GetInteractor()->RemoveAllObservers();
+  }
   UninstallPipe();
   delete d;
 }
@@ -111,9 +118,6 @@ void Viewer::InstallPipe() {
 }
 
 void Viewer::UninstallPipe() {
-  if (GetRenderer()) {
-    GetRenderer()->RemoveAllViewProps();
-  }
 }
 
 void Viewer::Render() {

src/Vtk/vtkHandlerWidget.cpp

@@ -100,6 +100,7 @@ vtkHandlerWidget::vtkHandlerWidget() : d(new HandlerWidgetData()) {
 }
 
 vtkHandlerWidget::~vtkHandlerWidget() {
+  this->SetEnabled(0);
   delete d;
 }
 
@@ -194,9 +195,12 @@ void vtkHandlerWidget::SetEnabled(int enabling) {
 
     this->Enabled = 0;
     this->Highlight(nullptr);
-    this->Interactor->RemoveObserver(this->EventCallbackCommand);
-    if (this->Interactor->GetRenderWindow()) {
-        this->Interactor->GetRenderWindow()->RemoveRenderer(this->d->m_OverlayRenderer);
+    if (this->Interactor) {
+      this->Interactor->RemoveObserver(this->EventCallbackCommand);
+      if (this->Interactor->GetRenderWindow()) {
+          this->Interactor->GetRenderWindow()->MakeCurrent();
+          this->Interactor->GetRenderWindow()->RemoveRenderer(this->d->m_OverlayRenderer);
+      }
     }
     this->d->m_OverlayRenderer->RemoveAllViewProps();
     this->InvokeEvent(::vtkCommand::DisableEvent, nullptr);
@@ -792,21 +796,23 @@ void vtkHandlerWidget::UpdateGizmoPosition() {
   if (bboxSize < 1e-6) bboxSize = 1.0;
 
   double screenLimit = bboxSize * 2.0; // Default if no renderer
-  if (this->CurrentRenderer) {
-    int *sz = this->CurrentRenderer->GetSize();
-    if (sz[1] > 0) {
-      double pixelSize = std::min(sz[0], sz[1]) / 5.0;
-      vtkCamera *cam = this->CurrentRenderer->GetActiveCamera();
-      if (cam->GetParallelProjection()) {
-        screenLimit = (pixelSize / (double)sz[1]) * 2.0 * cam->GetParallelScale();
-      } else {
-        double dist = cam->GetDistance();
-        double angleRad = vtkMath::Pi() * cam->GetViewAngle() / 180.0;
-        double viewHeightAtDist = 2.0 * dist * tan(angleRad / 2.0);
-        screenLimit = (pixelSize / (double)sz[1]) * viewHeightAtDist;
+    if (this->CurrentRenderer && this->CurrentRenderer->GetRenderWindow() && this->CurrentRenderer->GetRenderWindow()->GetInteractor()) {
+      int *sz = this->CurrentRenderer->GetSize();
+      if (sz[1] > 0) {
+        double pixelSize = std::min(sz[0], sz[1]) / 5.0;
+        vtkCamera *cam = this->CurrentRenderer->GetActiveCamera();
+        if (cam) {
+          if (cam->GetParallelProjection()) {
+            screenLimit = (pixelSize / (double)sz[1]) * 2.0 * cam->GetParallelScale();
+          } else {
+            double dist = cam->GetDistance();
+            double angleRad = vtkMath::Pi() * cam->GetViewAngle() / 180.0;
+            double viewHeightAtDist = 2.0 * dist * tan(angleRad / 2.0);
+            screenLimit = (pixelSize / (double)sz[1]) * viewHeightAtDist;
+          }
+        }
       }
     }
-  }
   double scaleFactor = std::min(bboxSize, screenLimit);
 
   vtkNew<vtkMatrix4x4> mat_gizmo;

src/Vtk/vtkViewport.cpp

@@ -64,9 +64,23 @@ Viewport::Viewport()
 {
 }
 
+void Viewport::DisableHandler() {
+    if (d->m_HandlerWidget) {
+        d->m_HandlerWidget->SetEnabled(0);
+    }
+}
+
 Viewport::~Viewport()
 {
+    if (d->m_HandlerWidget) {
+        d->m_HandlerWidget->SetEnabled(0);
+        d->m_HandlerWidget = nullptr;
+    }
     if (d->m_Renderer) {
+        if (d->m_Renderer->GetActiveCamera()) {
+            d->m_Renderer->GetActiveCamera()->RemoveAllObservers();
+        }
+        d->m_Renderer->RemoveAllObservers();
         d->m_Renderer->RemoveAllViewProps();
     }
     delete d;

src/Vtk/vtkViewport.h

@@ -58,6 +58,7 @@ public:
     virtual vtkRenderWindowInteractor* GetInteractor() = 0;
     vtkCornerAnnotation*        GetAnnotation();
     vtkCameraOrientationWidget* GetCameraWidget();
+    void                        DisableHandler();
     const std::vector<Puppet*>& getPuppets() const { return m_Puppets; }
 
     // Grid control