[vtkusers] SynchroGrab4D, vtk Polaris tracking

[David Gobbi]

Hi Atul,

I'm glad to hear that you were successful.  The pre-multiply versus
post-multiply in vtkTransform is tricky.

 - David

On Mon, Aug 10, 2015 at 8:57 AM, Atul <sharmaatul11 at gmail.com> wrote:

> 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] <[hidden email]
> <http:///user/SendEmail.jtp?type=node&node=5733387&i=0>> 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
>>
>>
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