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Search: Posts Made By: willpower2727
Forum: Vizard 03-31-2016, 09:27 AM
Replies: 20
Views: 38,302
Posted By willpower2727
I access Nexus data using my own TCP connection...

I access Nexus data using my own TCP connection with Nexus using Vicon's SDK. As far as I know, there is no supported (by WorldViz) way to get data from Nexus into Vizard. Vicon Tracker is the...
Forum: Vizard 03-31-2016, 07:30 AM
Replies: 20
Views: 38,302
Posted By willpower2727
Jeff's suggestion of using two position trackers...

Jeff's suggestion of using two position trackers and the optical heading in vizconnect might work well, but I can't test it since I have Vicon Nexus 1 and 2, not Tracker. If I had Tracker I'd try it...
Forum: Vizard 03-31-2016, 07:14 AM
Replies: 20
Views: 38,302
Posted By willpower2727
Kalman Filter for Euler Angles and Position data

I had to implement my own filter, Nexus does not have options for a real time filter (although we use 7 markers on the HMD, Nexus 2 in kinematic fit mode will use all available markers on the segment...
Forum: Vizard 03-30-2016, 09:34 AM
Replies: 20
Views: 38,302
Posted By willpower2727
optical tracking filters

For pure optical tracking we experience some "jitter" as you say. I tried two types of filters, a kalman and a moving average with a narrow time window to avoid lag.

Our system is Nexus 2.2.3 with...
Forum: Vizard 03-29-2016, 01:01 PM
Replies: 20
Views: 38,302
Posted By willpower2727
Our lab is for gait studies, subjects typically...

Our lab is for gait studies, subjects typically walk back and forth on a 9 meter walkway which renders the position tracker that came with the oculus useless. Not being able to get around the...
Forum: Vizard 03-15-2016, 09:09 AM
Replies: 20
Views: 38,302
Posted By willpower2727
The yaw drift is still present however. Any...

The yaw drift is still present however. Any advice on correcting for it? Should I try and re-calibrate the magnetometer? Apply a stronger magnetic field?
Forum: Vizard 03-14-2016, 07:16 AM
Replies: 20
Views: 38,302
Posted By willpower2727
It turns out the delays were caused by a bad USB...

It turns out the delays were caused by a bad USB cable. Sorry for the undue hassle.
Forum: Vizard 03-09-2016, 12:44 PM
Replies: 20
Views: 38,302
Posted By willpower2727
I've verified the following: frame rate: 75...

I've verified the following:

frame rate: 75 fps
Oculus configuration utility: v 1.1
Oculus SDK 0.8.0.0
Graphics card: Nvidia Quadro 4000 (a little older)
Graphics driver: 361.75

Is it sill...
Forum: Vizard 03-08-2016, 12:06 PM
Replies: 20
Views: 38,302
Posted By willpower2727
I've posted a video of what this looks like....

I've posted a video of what this looks like. Hopefully this helps explain what is happening.

https://www.youtube.com/watch?v=cLwD8iUvQ-8&feature=youtu.be
Forum: Vizard 03-08-2016, 11:09 AM
Replies: 20
Views: 38,302
Posted By willpower2727
I tested it just now with the oculusExample.py...

I tested it just now with the oculusExample.py script. Please note that I am not using the position tracker at the moment, just the hmd's gyro.

I did not notice a fast yaw drift. If there was a...
Forum: Vizard 03-03-2016, 07:10 AM
Replies: 20
Views: 38,302
Posted By willpower2727
I've also experienced an issue with the DK2...

I've also experienced an issue with the DK2 (Vizard 5) sensors lagging, then applying a different offset to the orientation. The effect is nauseating. I'm not sure what the cause is, maybe my loop is...
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