Discussion and Support for the OptiTrack, SmartNav and TrackIR brands by NaturalPoint

point of origin

by Lifeisabug » Mon Aug 09, 2010 2:36 am

I am working with TrackIR 5 and the OptiTrack 2D SDK.

The documentation states that the point of origin is in the upper left corner as we are used to in image processing. On my TrackIR 5 system, the point of origin seems to be in the upper right corner. I tested it with the sample code from this web page (OptiTrack Sample App). When i move to the right x values decrease. I didn't change anything in the sample code and it doesn't offer to mirror any axis.

Is this normal behavior on TrackIR 5?
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by Birch » Mon Aug 09, 2010 4:31 pm

Yes it is normal for a physical object moving left from the device's POV to have its reported X value decreasing. The lens causes the image to be horizontally flipped.
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by Lifeisabug » Tue Aug 10, 2010 8:08 am

Thanks a lot for the insight. Just to be clear, did I misunderstand the documentation of the OptiTrack SDK (Chapter 3.9) or is it faulty? Personally considering what you have said here, I found it misleading.

Cheers Bastian
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