[vtkusers] picking problem

[Dominik Szczerba]

Sounds a little like your input dataset gets processed and your original
IDs are lost (picking points on a cut plane through a 3D dataset will 
not give you original IDs). One way to consider is to keep the original 
IDs as a (int) scalar field.

- Dominik

Greg Book wrote:
> I'm creating an application in which the user picks points on a 
> vtkImagePlaneWidget and connects the points with lines. This is done 
> in-plane with the imageplanewidget. This part works fine, but now I need 
> to pick those existing in-plane points/cells and connect them in 3D. 
> I've setup a cellpicker and I'm performing picks (mouseover, then hit 
> 'p'), but the cell ids that it returns don't make any sense. (I do turn 
> off interaction and display of the imageplanewidgets when trying the 
> picking).
> 
> When I create the points/cells I note the location and cell id that was 
> created. when I do the picking, I note the same information... but the 
> cell ids don't always match up.
> 
> For example, I create 4 points, with cell ids 0,1,2,3. I then do picking 
> of the points in the same order, and get cell ids 1,4,5,3. The picked 
> coordinates do match in 3D.
> 
> Where are these weird cell ids coming from? I never explicitly created a 
> cell id 4 or 5... There is a bounding box around the imageplanewidget 
> setup, maybe this is getting in the way? Also, why does a red box show 
> up around my polydata when i hit 'p'?
> 
> I can include code if it helps in diagnosing this,
> -Greg
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