WorldViz User Forum  

Go Back   WorldViz User Forum > Vizard

Reply
 
Thread Tools Rate Thread Display Modes
  #1  
Old 07-16-2018, 08:40 AM
amir amir is offline
Member
 
Join Date: Apr 2018
Posts: 22
Walking is reversed in X and Z axes with motion capture.

When a user, wearing the tracking marker, is walking in the real environment, the Vizard virtual environment moves oppositely in the X and Z axes.
  • Walking left shows walking right on display
  • Walking right shows walking left on display
  • Walking forward shows walking backward on display
  • Walking backward shows walking forward on display

The Y axis is correct - i.e. moving the marker up shows upward translation on the display. Rotations are also correct.

The nature of this motion leads me to believe that Vizard thinks the marker is on the back of the body/head. If this were the case, then the tracking would be correct. However, given our camera setup, the tracking marker will be on the front of the HMD facing the cameras. Attached is a diagram of our setup for clarity.

I've tried every alignment iteration in Optotrak and still get the same problem every time. I am connecting to Optotrak via the below script. I haven't used VizConnect for this yet. Is there something that I can add in the script or specify in Vizconnect to get the X and Z movements to display correctly?

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

Thanks!
Attached Images
File Type: jpg Vizard-Optotrak Alignment.jpg (597.8 KB, 17 views)
Reply With Quote
  #2  
Old 07-25-2018, 09:47 PM
Jeff Jeff is offline
WorldViz Team Member
 
Join Date: Aug 2008
Posts: 2,426
In a previous thread it seemed like you had a similar issue and that was resolved. Is the camera location different in this current setup?
Reply With Quote
  #3  
Old 07-31-2018, 08:18 PM
amir amir is offline
Member
 
Join Date: Apr 2018
Posts: 22
It wasn't necessarily resolved. It just only works the way I want if I have the marker on the back of the head. However, I want it on the front of the head.
Reply With Quote
Reply

Tags
motion capture, optotrak, vizconnect, walking

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
about gesture capture and motion capture in Vizard through Kinect haohaoxuexi1 Vizard 2 10-16-2015 10:18 AM
Vsync prevents using fresh motion capture data in physics simulations? performlabrit Vizard 2 11-05-2013 11:48 AM
Streaming Motion Capture EnvisMJ Vizard 4 07-06-2010 11:50 AM
Motion Capture & CyberGloves EnvisMJ Vizard 1 10-01-2009 05:21 PM
Vizard Enterprise Edition and motion capture aaThomas Vizard 4 10-05-2007 11:31 AM


All times are GMT -7. The time now is 10:37 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2018, vBulletin Solutions, Inc.
Copyright 2002-2018 WorldViz LLC