[vtkusers] unhandled exception in program using MouseInteraction

[cerina]

i'm working on a subject intitled: selective and progressive visualization of
3D meshes, so that, when the user pick on the mesh, i want to get the
PointId of the picked point, and get its region (according to the octree) ,
in order to retrieve alli region's points, and then refine this region
localy to the highest level, by decompression.and yes, i have seen your
picking example in the wiki :)



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