[vtkusers] SynchroGrab4D, vtk Polaris tracking

[Atul]

Dear David,

In past, I could successfully make an augmented reality (AR) system with NDI
Ascension EM tracker, which can run on a torso phantom and its 3D model. The
tracking of the real and virtual scenes looks fine.
However, when I replace EM tracker with the NDI spectra optical tracker  in
the same AR system, the tracking of the real and the virtual scene does not
look good. The behavior of NDI spectra and Ascesion EM tracker does not seem
same. I was unsuccessful in finding any correlation between their behavior
which would make my tracking correct. 

Do I need to do some tweak before I replace EM tracker with NDI Spectra
optical tracker ? Please help if you had similar experience with EM tracker
and optical tracker. 

Thank you.
Atul 



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