GVU Technical Report Number:
GIT-GVU-96-17
Title:
Evaluation of the Effects of Frame Time Variation on VR Task Performance
Authors:
Benjamin Watson
Victoria Spaulding
William Ribarsky
Abstract:
We present a first study of the effects of frame time variations, in both
deviation around mean frame times and period of fluctuation, on task
performance in a virtual environment (VE). Chosen are open and closed
loop tasks that are typical for current applications or likely to be
prominent in future ones. The results show that at frame times in the
range deemed acceptable for many applications, fairly large deviations in
amplitude over a fairly wide range of periods do not significantly affect
task performance. However, at a frame time often considered a minimum
for immersive VR, frame time variations do produce significant effects on
closed loop task performance. The results will be of use to designers of
VEs and immersive applications, who often must control frame time
variations due to large fluctuations of complexity (graphical and
otherwise) in the VE.
Keywords:
Virtual reality, frame rate, latency, lag, user studies, level of detail,
open-loop, closed-loop
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