WorldViz User Forum  

Go Back   WorldViz User Forum > Precision Position Tracker (PPT)

Reply
 
Thread Tools Rate Thread Display Modes
  #1  
Old 03-31-2015, 03:10 PM
adhocdown adhocdown is offline
Member
 
Join Date: Mar 2015
Posts: 10
Unhappy Orientation Gone Awry

When we initially calibrate the PPT, our orientation is perfect. However, after the first run the orientation changes, seemingly at random.

For example, when the person attempts to walk straight, she will move to the right or completely backwards in the environment.

As a side note, we are transferring tracking data wirelessly, but latency is not an issue.
Reply With Quote
  #2  
Old 04-01-2015, 05:01 AM
Jeff Jeff is offline
WorldViz Team Member
 
Join Date: Aug 2008
Posts: 2,471
Can you describe how you are getting the orientation data? Is it with an inertial sensor or PPT Eyes?
Reply With Quote
  #3  
Old 04-04-2015, 01:30 PM
adhocdown adhocdown is offline
Member
 
Join Date: Mar 2015
Posts: 10
We receive information via the HMD (Oculus Rift), which uses an inertial sensor.
Reply With Quote
  #4  
Old 04-14-2015, 03:34 PM
Jeff Jeff is offline
WorldViz Team Member
 
Join Date: Aug 2008
Posts: 2,471
If you're getting yaw drift you can correct that by adding the optical heading plug-in in vizconnect. This setup requires that you have two PPT markers mounted above the HMD.
Reply With Quote
  #5  
Old 10-07-2015, 11:14 AM
johnallen johnallen is offline
Member
 
Join Date: Nov 2013
Location: Canterbury, UK
Posts: 36
Quote:
Originally Posted by Jeff View Post
If you're getting yaw drift you can correct that by adding the optical heading plug-in in vizconnect. This setup requires that you have two PPT markers mounted above the HMD.
I have this same problem and I'm considering 2 possible solutions.

1/ I have 6 tracking lights/markers in all but usually only use one for tracking the participant's head so have I understood you correctly that I could use two of my spare ones to orient the yaw for the rift? (in a similar way to your eyes 2014 product?)

I usually try to use vizconnect to configure my hardware setup. Can you advise how I could integrate my markers with this please for yaw control? and how I get Vizard to take the yaw settings from the markers but to take the pitch and roll setting from the rift.

Also, should I always fix them a set, fixed separation?

2/ Or, alternatively, I have a spare intersense wireless inertiacube3. Would I be better to get Vizard to use this for the yaw, pitch and roll settings and to use the rift as a dumb display. Again, advice on configuraton in Vizconnect would be much appreciated.

I would favour whichever approach gave me the best responsiveness.

Thanks,
John
Reply With Quote
  #6  
Old 10-08-2015, 04:18 PM
Jeff Jeff is offline
WorldViz Team Member
 
Join Date: Aug 2008
Posts: 2,471
To use optical heading in vizconnect, go to the trackers tab and:

1) Add the two PPT trackers
2) Add the orientation sensor of the rift
3) Add the optical heading tracker and specify the left/right position trackers, orientation tracker, and distance between position trackers

The inertiaCube3 may also have the same drift. However, intersense provides two calibration procedures with their ISDemo software which may help reduce or eliminate it.
Reply With Quote
Reply

Tags
finicky, inconsistent, offset, orientation, ppt

Thread Tools
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
System stopped recognizing position (while orientation still works) royb Vizard 2 11-06-2013 07:00 AM
problem in setting the orientation of bones bharatbhushan Vizard 0 06-30-2009 05:30 AM
Loading OSG models and orientation Joran Vizard 4 06-18-2009 06:43 AM
orientation question whj Vizard 3 01-21-2009 12:22 PM
(beginner) calculating orientation change with eulers astull Vizard 16 02-22-2007 10:45 AM


All times are GMT -7. The time now is 02:23 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2024, vBulletin Solutions, Inc.
Copyright 2002-2023 WorldViz LLC