[vtkusers] picking a point & changing its coordinate

[jelle]

Hi,

I'm making a simple app in (t)vtk, where i need to pick a point out of a set of
points and than to be able to change the coordinates of this point.

So far, I've understood to use vtkPointPicker to select the point and the
vtkPointWidget to change the coordinates of the selected point. Also probably I
should add an observer to the vtkRenderWindowInteractor object, but I'm having a
hard time figuring out how to combine these elements. Any pointers on how to do
so would be very much appreciated!

Many thanks,

-jelle