[vtkusers] Get a list of selected graph vertices

[Jim Peterson]

I think I would consider using the EndPick observer to try to access the 
vtkSelection. It might be as simple as using GenerateSelection() as 
opposed to Select() then, and it would eliminate all the subclassing of 
the vtk elements.

Jim

David Doria wrote:
>> There are restrictions documented for the vtkHardwareSelector, I am not sure
>> graph vertices are candidates for selection.
>>
>> Hope that helps,
>> Jim
>>     
>
> I am not sure using the Selector directly is the best way to go - that
> was just where my search through the code led me. I see now that the
> Selector is a member of the Renderer, that takes away one level of my
> mess :)
>
> One of the objects already knows about the selection, because the
> default behavior is to highlight the selected vertices/edges! All I
> want to know is the IDs of these things that have been selected. The
> selection shouldn't have to be performed again.
>
> David
>
>