[vtkusers] is there a way to capture the x-y-z coordinates of a picture in coordinate system?

[Gökhan ERSOY]

is there a way to capture the x-y-z coordinates of a picture in coordinate
system? i was doing it in OpenCV. But now i have to use VTK, and i have to
capture position values. can anybody help me?

thanks...
*
Gökhan*
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