[vtkusers] unhandled exception in program using MouseInteraction

[David Doria]

On Sun, Sep 2, 2012 at 5:03 PM, cerina <cerine-baratelli at hotmail.fr> wrote:
>
> sorry, it was a mistake when I create the post for the first time ( it was in
> html format), and here is the code:
> #include <vtkObjectFactory.h>
> #include "vtkOctree.h"
> #include "RenderWindow.h"
> #include <vtkRenderWindowInteractor.h>
> #include <vtkInteractorStyleTrackballCamera.h>
> #include <vtkPointPicker.h>
> #include <vtkSmartPointer.h>
> #include <vtkUnstructuredGrid.h>
> #include <vtkPolyDataMapper.h>
> #include <vtkActor.h>
> // Catch mouse events
> class MouseInteractorStyle : public vtkInteractorStyleTrackballCamera
> {
>   public:
>   static MouseInteractorStyle* New();
>
>   vtkSurface* Mesh2;// here is the input Data
>   vtkIntArray *lesNodes;// this is the nodes of the octree
>
>     virtual void OnLeftButtonDown()
>     {
>
>       int* pos = this->GetInteractor()->GetEventPosition();
>   vtkSmartPointer<vtkPointPicker> picker =
>   vtkSmartPointer<vtkPointPicker>::New();
>   picker->Pick(pos[0], pos[1], pos[2], this->GetDefaultRenderer());
>   double* worldPosition = picker->GetPickPosition();
>   vtkIdType c=picker->GetPointId();
>   cout<<" the PointId is : "<<picker->GetPointId()<<endl;
>   cout&lt;&lt;&quot; point coordinates are:
> &quot;&lt;&lt;pos[0]&lt;&lt;&quot; &quot;&lt;&lt;pos[1]&lt;&lt;&quot;
> &quot;&lt;&lt;pos[2]&lt;&lt;endl;
>                Mesh2->GetPoint(c);
>         cout<<"nombre des sommets : "<< Mesh2->GetNumberOfPoints()<<endl;
>
> this->Interactor->GetRenderWindow()->GetRenderers()->GetFirstRenderer()->AddActor(selectedActor);
>       vtkInteractorStyleTrackballCamera::OnLeftButtonDown();
>         };
> };
>
> vtkStandardNewMacro(MouseInteractorStyle);
>
> void vtkOctree::Decompose(vtkSurface *Mesh1)
> {
>         RenderWindow *Window=RenderWindow::New();
>         Window->SetInput(this->Input);
>         vtkIntArray *PointsNode=vtkIntArray::New();
>         PointsNode->SetNumberOfValues(this->Input->GetNumberOfPoints());
>                /***********************************/
>                 here , there is the long code that  subdivide the octree: i
> will not put it
>                /***********************************/
>
>                 // create polydata for visualization
>         cout<<NumberOfSplitNodes&lt;&lt;&quot; Nodes
> split&quot;&lt;&lt;endl;
>         Window->DisplayVerticesColors(PointsNode);
>         Window->Render();
>              //here i initialize the interaction
>              vtkRenderWindowInteractor
> *interactor=vtkRenderWindowInteractor::New();
>         interactor->SetRenderWindow(Window->GetvtkRenderWindow());
>         interactor->Initialize();
>         vtkSmartPointer<MouseInteractorStyle> style =
> vtkSmartPointer<MouseInteractorStyle>::New();
>         style->Mesh2=Mesh1;
>         style->lesNodes=PointsNode;
>         interactor->SetInteractorStyle(style);
>         Window->GetvtkRenderWindow()->SetInteractor(interactor);
>         interactor->Start();
>         Window->Interact();
>
>         Window->Delete();
>         PointsNode->Delete();
> }
>
> and this is the main  file:
>
> #include "vtkSurface.h"
> #include "RenderWindow.h"
> #include "vtkOctree.h"
>
>
> int main( int argc, char *argv[] )
> {
>          // Parse command line arguments
>   if(argc != 2)
>     {
>     std::cout << "Usage: " << argv[0] << " Filename(.ply)" << std::endl;
>     return EXIT_FAILURE;
>     }
>
>         vtkSurface *Mesh;
>
>         // Load the mesh and create the vtkSurface data structure
>         Mesh=vtkSurface::New();
>         cout <<"load : "<<argv[1]&lt;&lt;endl;
>         Mesh->CreateFromFile(argv[1]);
>         Mesh->DisplayMeshProperties();
>
>         vtkOctree *Octree=vtkOctree::New();
>         Octree->SetInput(Mesh);
>         Octree->Decompose(Mesh);
>
>         return (0);
> }
> Sorry again


The formatting (indention) is still weird, and has html characters
embedded, etc.

I'm also not sure what your octree method has anything to do with
picking a point on the mesh? In VTK you need to have a non-spatial
data structure representation (i.e. a normal vtkPolyData) of your mesh
to display it, so this problem should have nothing to do with that.
Have you seen the picking examples on the wiki?

David