<s>
An	O
omnidirectional	B-General_Concept
treadmill	I-General_Concept
(	O
ODT	O
)	O
is	O
a	O
mechanical	O
device	O
,	O
similar	O
to	O
a	O
typical	O
treadmill	O
,	O
that	O
allows	O
a	O
person	O
to	O
perform	O
locomotive	O
motion	O
in	O
any	O
direction	O
,	O
allowing	O
for	O
360	O
degrees	O
of	O
movement	O
.	O
</s>
<s>
Omnidirectional	B-General_Concept
treadmills	I-General_Concept
are	O
employed	O
in	O
immersive	O
virtual	B-General_Concept
environment	I-General_Concept
implementations	O
to	O
allow	O
unencumbered	O
movement	O
within	O
the	O
virtual	B-Application
space	I-Application
.	O
</s>
<s>
Advantages	O
to	O
pairing	O
an	O
ODT	O
with	O
an	O
immersive	O
virtual	B-General_Concept
environment	I-General_Concept
include	O
:	O
</s>
<s>
One	O
path	O
seeks	O
to	O
create	O
wholly	O
immersive	O
,	O
obstruction	O
free	O
environments	O
as	O
in	O
virtual	B-Application
reality	I-Application
,	O
while	O
the	O
other	O
seeks	O
a	O
lower	O
cost	O
,	O
more	O
restricted	O
device	O
.	O
</s>
<s>
The	O
second	O
approach	O
employs	O
a	O
harness	O
for	O
tracking	O
,	O
and	O
optionally	O
provides	O
whole-body	O
force	B-Device
feedback	I-Device
.	O
</s>
<s>
And	O
the	O
well-defined	O
user	O
space	O
makes	O
interaction	O
with	O
outside	O
haptic	B-Device
devices	I-Device
feasible	O
.	O
</s>
<s>
Omnidirectional	B-General_Concept
treadmills	I-General_Concept
have	O
the	O
potential	O
to	O
also	O
be	O
used	O
in	O
film	O
,	O
such	O
as	O
in	O
conjunction	O
with	O
a	O
green	O
screen	O
.	O
</s>
