WorldViz User Forum  

Go Back   WorldViz User Forum > Vizard

Reply
 
Thread Tools Rate Thread Display Modes
  #1  
Old 10-12-2008, 09:38 PM
vjesse vjesse is offline
Member
 
Join Date: Sep 2006
Posts: 3
Max system latency for HMD?

Hello,

I am trying to determine the maximum system latency for our system that implements Vizard 3.0 software. The following are the specifications:

The HMD is an nVisor SX with dual 1280 horizontal by 1024 vertical pixel resolution panels. The display presents a visual field subtending approximately 50 degrees horizontally by 38 degrees vertically. Stereoscopic images are rendered by a 1900 MHz Pentium computer with an NVIDIA GeForce 6600 graphics card and updated at an average frame rate of 60 Hz.
Head movements are tracked by a three-axis orientation sensing system (Intersense IS250 with an update rate of 150 Hz) and used to continuously update the simulated viewpoint. The position of the participant along the X, Y, and Z planes was tracked via an optical tracking system (WorldViz PPT with an update rate of 60 Hz).

Thanks for any feedback you may have!
Jesse
Reply With Quote
  #2  
Old 10-13-2008, 03:00 PM
farshizzo farshizzo is offline
WorldViz Team Member
 
Join Date: Mar 2003
Posts: 2,849
The latency can vary when using the PPT system. It should be somewhere between 60-80 milliseconds. The latency on the PPT side can vary between 20-30 ms. Assuming you are sending the data using VRPN, this will add another 5 ms. Then on the Vizard side you will have a 32-48 ms latency due to double buffering of the output images.
Reply With Quote
  #3  
Old 10-13-2008, 03:09 PM
vjesse vjesse is offline
Member
 
Join Date: Sep 2006
Posts: 3
thanks!

Thank you for the feedback!

j
Reply With Quote
  #4  
Old 10-13-2008, 05:47 PM
vjesse vjesse is offline
Member
 
Join Date: Sep 2006
Posts: 3
Intersense cube?

Does the Intersense cube add any additional latency?
Reply With Quote
  #5  
Old 10-13-2008, 05:48 PM
farshizzo farshizzo is offline
WorldViz Team Member
 
Join Date: Mar 2003
Posts: 2,849
The InterSense itself has latency, but it is less than the PPT latency, so it shouldn't add additional latency.
Reply With Quote
Reply

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
Printing of System Time Uttama_vizard Precision Position Tracker (PPT) 2 09-19-2007 02:38 PM
Patriot Polhemus System Vinicius Lima Vizard 5 07-25-2007 09:51 AM
ImmersaDesk system tracking kgarr Vizard 10 09-14-2006 11:17 AM
Particle System... again... k_iwan Vizard 2 05-09-2006 12:42 AM
accessing system speaker noise pkhoosh Vizard 2 01-25-2006 10:22 AM


All times are GMT -7. The time now is 01:38 AM.


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