[Insight-users] Problem in obtaining world position with vtkSeedWidget

[Karthik Krishnan]

The default representation for the individual handles created by
vtkSeedRepresentation is a 2D rep (vtkPointHandleRepresentation2D). It
does not have a notion of Z coordinate since its rendered on the
overlay plane. If you want 3D seeds, change the default handle
representation to an instance of  vtkPointHandleRepresentation3Dvia :
vtkSeedRepresentation::SetHandleRepresentation

On 1/11/11, Xiaopeng Yang <yxp233 at postech.ac.kr> wrote:
> Dear Users,
>
>
>
> I am trying to get world position by
> SeedRepresentation->GetSeedWorldPosition(I, pos). But comparing with other
> software, I got the wrong value in z coordinate. The values of x and y
> coordinates are correct. I would appreciate if anyone can point me in the
> right direction.
>
>
>
> Thanks,
>
> Yang
>
>
>
> class vtkSeedCallback : public vtkCommand
>
> {
>
>   public:
>
>     static vtkSeedCallback *New()
>
>     {
>
>       return new vtkSeedCallback;
>
>     }
>
>     vtkSeedCallback() {}
>
>     virtual void Execute(vtkObject*, unsigned long event, void *calldata)
>
>     {
>
>       if(event == vtkCommand::PlacePointEvent)
>
>       {
>
>         std::cout << "Point placed, total of: "
>
>             << this->SeedRepresentation->GetNumberOfSeeds() << std::endl;
>
>       }
>
>       if(event == vtkCommand::InteractionEvent)
>
>       {
>
>         if(calldata)
>
>         {
>
>           std::cout << "Interacting with seed : "
>
>               << *(static_cast< int * >(calldata)) << std::endl;
>
>         }
>
>       }
>
>
>
>       std::cout << "List of seeds (Display coordinates):" << std::endl;
>
>
>
>       for(vtkIdType i = 0; i < this->SeedRepresentation->GetNumberOfSeeds();
> i++)
>
>         {
>
>         double pos[3];
>
>         this->SeedRepresentation->GetSeedWorldPosition(i, pos);
>
>         std::cout << "(" << pos[0] << " " << pos[1] << " " << pos[2] << ")"
> << std::endl;
>
>         }
>
>
>
>      }
>
>
>
>     void SetRepresentation(vtkSmartPointer<vtkSeedRepresentation> rep)
> {this->SeedRepresentation = rep;}
>
>     private:
>
>     vtkSmartPointer<vtkSeedRepresentation> SeedRepresentation;
>
> };
>
>