Optical Heading reverses

[dcnieho]

I am using a DK2+optical heading setup with two markers rigidly mounted on the DK2 at 19.5 cm distance. The markers a tracked by a PPT-X system running on PPT studio 2008. It's basically the DK2+optical heading preset.

Sometimes, even when in the best part of my tracking area, but more frequently when near the edges where not all cameras have a good view, the view suddenly rotates by 180 degrees, like my head is facing down my back. I could probably detect this programmatically and rotate it right back, but what is the correct call for this? callign _swap() of the optical heading module is probably not a good idea.

Or better yet, how to avoid this?

Thanks!