[vtkusers] BoxWidget + VolumeMapper errors

[dean.inglis at camris.ca]

David, 

just to re-iterate, the original problem was:

 box->GetPlanes(planes);
 mapper->SetClippingPlanes(planes);

when planes is a vtkPlanes.  So yes, this
can be simplified when vtkPlanes is behaving as
expected.  Otherwise, 
vtkAbstractMapper::SetPlanes(vtkPlanes*)
will still fail. Thanks for the clarifications.

Dean


> Also, Dean, note that as Mathieu said, you can simplify your code
> by just doing
> 
> box->GetPlanes(planes);
> mapper->SetClippingPlanes(planes);
> 
> Cheers,
>  - David
> 
> 
> On Thu, 27 May 2004, Dean Inglis wrote:
> 
> > 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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> >
> >
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> 
>