[vtkusers] Picking a VolumeRaycast

[Felipe de Souza]

I'am developing a measurement module to a medical software called InVesalius

We're  using the vtkVolumeRayCast and when I use a vtkCellPicker to get the
position clicked, it doesn't work correctly with VolumeRayCast, the recoved
position always stay in the bounds of the volume.

I would like anybody can say to me if exists some pick that gets the clicked
position correctly.
thanks!!!
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