From: Robert.van.Liere@cwi.nl
Sent: Thursday, May 18, 2000 10:22 AM
To: bowman@vt.edu
Subject: Re: need references


Hi Doug,

> tracking systems.

You should look at Colin Ware's work on the effect of lag
on interactive tasks. Also, Steve Ellis has done work in this
area.

Ware and Ellis try to relate latency with respect to Fitts law.
Ware also looks various types of latencies.

Here are some refs:

1. "Reaching for Objects in VR Displays: Lag and Frame Rate"
    C. Ware & R. Balakrisan
    Trans CHI vol 1, num 4, 1994, 331-356

2. "Factors Influcing Operator Interaction with Virtual Objects via
   see-through HMD: viewing conditions and rendering latency"
   S. Ellis, et. al.
   VRIAS'97, 138-145

3. "Sensor Spatial Distortion, Visual Latency and Update Rate Effects on 
   3D Tracking in VEs"
   S. Ellis, et. at.
   VR 1999, 218-221

4. "Effects of Network Charateristics on Human Performance in a 
    Collaborative VE"
    K. Park and R. Kenyon
    VR 1999, 104-111


We tried looking at some issues that have not been researched, but
figured it wasn't worth the trouble......

-- Robert