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  #1  
Old 05-30-2018, 12:34 PM
amir amir is offline
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Join Date: Apr 2018
Posts: 22
Mismatched Translation Between Real Motion and Display

Iím using Optotrak to capture motion to update the visual scene accordingly. However, I canít get the scene to react properly to the marker motion. Below is how the first-person view in the scene changes when moving I move with the marker.
  • Marker turns to the left = scene turns to the left
  • Marker turns to the right = scene turns to the right
  • Marker moves forward = scene moves to the right
  • Marker moves backward = scene moves to the left
  • Marker moves left = scene moves forward
  • Marker moves right = scene moves backward

When we rotate left and right, the scene updates how we want. But as shown above, the 4 translations do not update the scene correctly. I performed my Optotrak alignment to match the XYZ coordinates of the pit.osgb model that Vizard provides, but the real-life motion still doesnít update the visual scene correctly.

Am I approaching this wrong? Is there something I need to add to the script regarding the coordinate system?

Thanks!
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  #2  
Old 05-30-2018, 03:37 PM
Jeff Jeff is offline
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Join Date: Aug 2008
Posts: 2,414
It should not be necessary to make any modifications to the coordinate system in Vizard. Try testing with the following script after specifying the correct hostname:

Code:
import viz
viz.go()

viz.addChild('piazza.osgb')

opto = viz.add('optotrak.dle',0,'192.168.0.114') 
body = opto.getBody(0)

viz.link(body,viz.MainView)
This video tutorial is quite old but it may help with the optotrack setup.
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  #3  
Old 05-31-2018, 07:17 AM
amir amir is offline
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Join Date: Apr 2018
Posts: 22
I repositioned the cameras while using the default Optotrak alignment and it now tracks properly.

Thanks!
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motion capture, optotrak, tracker, trackers

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