[vtkusers] Picking a point in volume render

[qwcbeyond]

Hi,everyone,I have a question about picking in volume render. Is it posssible
to use a mouse position to get the position of a point in volume render? I
found the vtkVolumePiker,but it relies on the isosurface.  Do anyone have
some easy way to pick the voxel in the volume?Thanks. 

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