[vtkusers] Get 2D ZSlice value from 3D point.

[superzz]

Hello
I am reconstructing 3D image from DICOM files and present it to user. User
can pick point on 3D image. Then I need to show the 2D dicom with
corresponding ZSlice to user. Is there an easy way to get it?

I've tried to calculate ZSlice value from point.X / spacing[2]. But it seems
that the result is incorrect.

Thanks

superZZ
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