Merge branch 'FixOpenVRInit' into 'master'

Fix OpenVR initialization (fixes crash on VTK >= 9.1)

Closes vtk#18433

See merge request vtk/vtk-examples!290

Author: ajpmaclean

src/Cxx/GeometricObjects/OpenVRCone.cxx

@@ -32,6 +32,7 @@ int main(int, char*[])
       vtkSmartPointer<vtkOpenVRRenderer>::New();
   vtkSmartPointer<vtkOpenVRRenderWindow> renderWindow =
       vtkSmartPointer<vtkOpenVRRenderWindow>::New();
+  renderWindow->Initialize();
   renderWindow->AddRenderer(renderer);
   vtkSmartPointer<vtkOpenVRRenderWindowInteractor> renderWindowInteractor =
       vtkSmartPointer<vtkOpenVRRenderWindowInteractor>::New();

src/Cxx/GeometricObjects/OpenVRCube.cxx

@@ -24,6 +24,7 @@ int main(int, char*[])
   // Create a renderer, render window, and interactor
   vtkNew<vtkOpenVRRenderer> renderer;
   vtkNew<vtkOpenVRRenderWindow> renderWindow;
+  renderWindow->Initialize();
   renderWindow->AddRenderer(renderer);
   renderWindow->SetWindowName("OpenVRCube");
   vtkNew<vtkOpenVRRenderWindowInteractor> renderWindowInteractor;

src/Cxx/GeometricObjects/OpenVRCylinder.cxx

@@ -27,6 +27,7 @@ int main(int, char* argv[])
   // Create a renderer, render window, and interactor
   vtkNew<vtkOpenVRRenderer> renderer;
   vtkNew<vtkOpenVRRenderWindow> renderWindow;
+  renderWindow->Initialize();
   renderWindow->AddRenderer(renderer);
   renderWindow->SetWindowName("OpenVRCylinder");
   vtkNew<vtkOpenVRRenderWindowInteractor> renderWindowInteractor;

src/Cxx/GeometricObjects/OpenVRFrustum.cxx

@@ -51,6 +51,7 @@ int main(int, char*[])
   // Create a renderer, render window, and interactor
   vtkNew<vtkOpenVRRenderer> renderer;
   vtkNew<vtkOpenVRRenderWindow> renderWindow;
+  renderWindow->Initialize();
   renderWindow->AddRenderer(renderer);
   renderWindow->SetWindowName("OpenVRFrustum");
   vtkNew<vtkOpenVRRenderWindowInteractor> renderWindowInteractor;

src/Cxx/GeometricObjects/OpenVROrientedArrow.cxx

@@ -120,6 +120,7 @@ int main(int, char*[])
   // Create a renderer, render window, and interactor
   vtkNew<vtkOpenVRRenderer> renderer;
   vtkNew<vtkOpenVRRenderWindow> renderWindow;
+  renderWindow->Initialize();
   renderWindow->AddRenderer(renderer);
   renderWindow->SetWindowName("OpenVROrientedArrow");
   vtkNew<vtkOpenVRRenderWindowInteractor> renderWindowInteractor;

src/Cxx/GeometricObjects/OpenVROrientedCylinder.cxx

@@ -125,6 +125,7 @@ int main(int, char*[])
   // Create a renderer, render window, and interactor
   vtkNew<vtkOpenVRRenderer> renderer;
   vtkNew<vtkOpenVRRenderWindow> renderWindow;
+  renderWindow->Initialize();
   renderWindow->AddRenderer(renderer);
   renderWindow->SetWindowName("OpenVROrientedCylinder");
   vtkNew<vtkOpenVRRenderWindowInteractor> renderWindowInteractor;

src/Cxx/GeometricObjects/OpenVRSphere.cxx

@@ -27,6 +27,7 @@ int main(int, char*[])
   // Create a Renderer, RenderWindow, RenderWindowInteractor
   vtkSmartPointer<vtkOpenVRRenderer> renderer;
   vtkSmartPointer<vtkOpenVRRenderWindow> renderWindow;
+  renderWindow->Initialize();
   renderWindow->AddRenderer(renderer);
   renderWindow->SetWindowName("OpenVRSphere");
   vtkSmartPointer<vtkOpenVRRenderWindowInteractor> renderWindowInteractor;

src/Cxx/GeometricObjects/OpenVRTessellatedBoxSource.cxx

@@ -48,6 +48,7 @@ int main(int /* argc */, char* /* argv */[])
   // Create a renderer, render window, and interactor
   vtkNew<vtkOpenVRRenderer> renderer;
   vtkNew<vtkOpenVRRenderWindow> renderWindow;
+  renderWindow->Initialize();
   renderWindow->AddRenderer(renderer);
   renderWindow->SetWindowName("OpenVRTessellatedBoxSource");
   vtkNew<vtkOpenVRRenderWindowInteractor> renderWindowInteractor;