[vtkusers] picking vtkImageSlice using vtkCellPicker?

[David Gobbi]

Hi Miro,

You'll have to provide more details, because I use vtkCellPicker on
vtkImageSlice all the time.  It's even part of the nightly VTK testing.
Is there anything special about the way you use the vtkImageSlice?
What version of VTK are you using?

  David

On Thu, Mar 20, 2014 at 1:15 PM, Miro Drahos <mdrahos at robodoc.com> wrote:
> Hi all,
> I am rendering an image slice using vtkImageSlice and a surface (vtkActor).
> When I perform picking using vtkCellPicker, I always pick the surface actor,
> even if it is in the background, behind the vtkImageSlice.
> If I try to pick the vtkImageSlice (and the ray does not intersect the
> surface actor), the Pick() method returns 0, as well as picker->GetPath()
> returns NULL. The vtkImageSlice is set to be pickable.
> I am quite baffled by this, since I'd expect to be able to pick
> vtkImageSlice with vtkCellPicker, since it is a vtkProp3D.
> If I use vtkPropPicker, I can pick the image slice fine, but I would prefer
> to use vtkCellPicker so that I can specify picking tolerance.
> Can someone shed some light on this?
> Thank you tons!
> Miro