[vtkusers] vtkSeedWidget and vtkImageViewer2 bug in visualization?

[John Drescher]

On Tue, Apr 13, 2010 at 9:49 AM, Nicolas Rannou
<nicolas_rannou at hms.harvard.edu> wrote:
> Hello,
>
> I'm experimenting some troubles using vtkSeedWidget.
>
> I visualize a volume (*.mhd) in a vtkImageViewer2.
> Then I use vtkSeedWidget to select some points through the volume.
>
> The problem is that when I select one point in one slice, then move to
> another slice to select another point, I can see the actor of the first
> selected point even if I am not on the same slice anymore.
> If I move further, the first point will not be visible after some more
> slices...
> The coordinates (real world coordinates) of all the created points are good.
>
> The problem must be in the visualization/actors somewhere...
>
> I tried to use vtkConstrainedPointHandleRepresentation and
> vtkImageActorPointPlacer without success.
>
> Did somebody already face this issue or have any advice?
>
>
> Thanks for your help,
>

You need to either reimplement the seed widget to handle slices (I
have done this) or create a seed widget for each slice and then use
the callback mechanism to hide and restore seed widgets when the slice
changes.

John