[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
> clicked position, it doesn't work correctly with VolumeRayCast, the
> recovered 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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