[IGSTK-Users] NDI Polaris Spectra: Setting Tracking Volume

[Jason Gibbs]

Hello IGSTK Community,

We are having an issue that we aren't able to resolve, even with the
friendly assistance of some of the NDI support people.  We are using an NDI
Polaris Spectra tracker and are noticing that tools are losing track at a Z
depth of approximately 2400mm in our IGSTK-based app.  When using the NDI
Track GUI, however, the extended volume is set and can track to around
3000mm in the same direction.  We have flashed the tracker with a
configuration file which is supposed to change the default tracking volume
to the extended pyramid, however we obviously aren't seeing this in our
IGSTK-based app.

The NDI support staff suggested sending an appropriate VSEL command to the
tracker to select the tracking volume at runtime in our IGSTK app.  This,
however, seems to be pretty-well encapsulated away from standard library
usage (indeed, no VSEL command is sent), so we suspect this isn't the best
way to go with respect to the IGSTK architecture.  We are fine modifying our
version of the library to do this, but would very much appreciate guidance
on how to form the serial communication instructions and where to properly
fit these commands into the existing library.

Alternatively, if there are any tricks to initializing/saving this
information on the tracker itself so that we don't have to modify any IGSTK
internals, but the tracking volume used in IGSTK mirrors what appears in the
NDI Track GUI, we would much prefer to go that route.  We suspect that this
is a fairly common desire for users (to change the tracking volume to the
biggest one available) so we're hoping that I'm just missing something quite
obvious either in IGSTK or in the NDI configuration apps.

We would very much appreciate any advice/suggestions that the community may
have.

Thank you!

-Jason Gibbs
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