[vtkusers] BoxWidget + VolumeMapper errors

[Dean Inglis]

Okay, here is what works (not elegant but hey!)

<snip>
virtual void Execute(vtkObject *caller, unsigned long, void*)
  {
  vtkBoxWidget *box = reinterpret_cast<vtkBoxWidget*>(caller);
  box->GetPlanes( planes );
  mapper->RemoveAllClippingPlanes();
  for (int i = 0; i<planes->GetNumberOfPlanes(); i++ )
    {
    vtkPlane* newplane = vtkPlane::New();
    newplane->SetOrigin( planes->GetPlane(i)->GetOrigin() );
    newplane->SetNormal( planes->GetPlane(i)->GetNormal() );
    mapper->AddClippingPlane( newplane );
    newplane->Delete();
    }
  }
<snip>

So, I think vtkPlanes needs udpated documentation/cautionary warning
and perhaps vtkAbstractMapper should be modified?

Dean

>	why don't you simply use:

>void vtkAbstractMapper::SetClippingPlanes( vtkPlanes * planes )

>	This seems to be much easier to use, right ?

>HTH
>Mathieu


dean.inglis at camris.ca wrote:
> I am trying to use vtkBoxWidget with a callback to send its vtkPlanes
> to a vtkVolumeMapper as in
> VTK/Examples/GUI/Tcl/VolumeRenderWithBoxWidget.tcl
> Apparently, I should be passing in a vtkPlaneCollection, so I tried
> modifying my callback:
>
> class vtkBWCallback : public vtkCommand
> {
> public:
>   static vtkBWCallback *New()
>     { return new vtkBWCallback; }
>
>   virtual void Execute(vtkObject *caller, unsigned long, void*)
>     {
>       vtkBoxWidget *box = reinterpret_cast<vtkBoxWidget*>(caller);
>       box->GetPlanes( planes);
>       collection->RemoveAllItems();
>       for (int i = 0; i < planes->GetNumberOfPlanes(); i++)
>         {
>         collection->AddItem( planes->GetPlane(i) );
>         }
>       mapper->SetClippingPlanes( collection );
>     }
>   vtkBWCallback():planes(0),mapper(0),pc(0){};
>
>   vtkPlanes* planes;
>   vtkPlaneCollection* collection;
>   vtkVolumeTextureMapper2D* mapper;
> };
>
> no luck!
>
> I only get one plane acting as a clipping plane in both my .cxx app
>  and in the above VTK tcl example.  The plane with unit normal
> originally in the +z direction is the only valid plane.
> Can anyone else verify this error?  This is seen on two builds:
>
> 1) Borland C++ Builder vers. 5 , Win 2k Pro, Pentium 4,
> NVIDIA GeForce4 Ti 4400, driver 5.3.0.3, CMake 2.0.0, latest VTK cvs
>
> 2) Borland C++ Builder vers. 6 , Win 2k Pro, Pentium 4 mobile,
> NVIDIA Quadro4 500 GoGL,  driver 2.9.4.0, CMake 2.0.0, latest VTK cvs
>
> Dean
>
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