<div dir="ltr"><div><div><div>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. <br></div>Your help played a great role in making this system. Our team appreciate your help a lot.<br><br></div>Regards,<br></div>Atul<br></div><div class="gmail_extra"><br><div class="gmail_quote">On Mon, Aug 10, 2015 at 11:52 AM, David Gobbi [via VTK] <span dir="ltr"><<a href="/user/SendEmail.jtp?type=node&node=5733387&i=0" target="_top" rel="nofollow" link="external">[hidden email]</a>></span> wrote:<br><blockquote style='border-left:2px solid #CCCCCC;padding:0 1em' class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div dir="ltr"><span class="">Hi Atul,<div><br></div><div>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.</div><div><br></div></span><div> - David <span class=""><br><div class="gmail_extra"><br><div class="gmail_quote">On Sun, Aug 9, 2015 at 9:30 PM, Atul <span dir="ltr"><<a href="http:///user/SendEmail.jtp?type=node&node=5733375&i=0" rel="nofollow" link="external" target="_blank">[hidden email]</a>></span> wrote:<br><blockquote style='border-left:2px solid #CCCCCC;padding:0 1em' style="border-left:2px solid #cccccc;padding:0 1em" class="gmail_quote">Dear David,<br>
<br>
In past, I could successfully make an augmented reality (AR) system with NDI<br>
Ascension EM tracker, which can run on a torso phantom and its 3D model. The<br>
tracking of the real and virtual scenes looks fine.<br>
However, when I replace EM tracker with the NDI spectra optical tracker in<br>
the same AR system, the tracking of the real and the virtual scene does not<br>
look good. The behavior of NDI spectra and Ascesion EM tracker does not seem<br>
same. I was unsuccessful in finding any correlation between their behavior<br>
which would make my tracking correct.<br>
<br>
Do I need to do some tweak before I replace EM tracker with NDI Spectra<br>
optical tracker ? Please help if you had similar experience with EM tracker<br>
and optical tracker.<br>
<br>
Thank you.<br>
Atul</blockquote></div><br></div></span></div></div><span class="">
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