[vtkusers] SynchroGrab4D, vtk Polaris tracking

[Atul]

Thank you so much David. As you suggested in this email, I had already
followed them in my code. There were some error in code besides one obvious
error which was multiplication of tooltipcalibration matrix (we need to
post-multiply the tooltipcalibration matrix to the tooltransform matrix, I
was pre-multiplying it). I corrected all of them and now the system is
working as with EM tracker.
Your help played a great role in making this system. Our team appreciate
your help a lot.

Regards,
Atul

On Mon, Aug 10, 2015 at 11:52 AM, David Gobbi [via VTK] <
ml-node+s1045678n5733375h76 at n5.nabble.com> wrote:

> Hi Atul,
>
> The behaviour of the systems should be very similar, the only real
> difference is the frame of reference.  I.e. the frame of reference for the
> FOB tool will be different from the frame of reference for the Polaris
> tool, and the frame of reference for the FOB transmitter will be different
> from the frame of reference for the Polaris camera.  Moving from one system
> to the other, you have to re-calibrate.
>
>  - David
>
> On Sun, Aug 9, 2015 at 9:30 PM, Atul <[hidden email]
> <http:///user/SendEmail.jtp?type=node&node=5733375&i=0>> wrote:
>
>> 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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-- 
Atul Kumar
MBBS MMST  PhD
Research Fellow
IRCAD-Taiwan




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