<s>
Vis5D	B-Application
is	O
a	O
3D	O
visualization	B-Application
system	I-Application
used	O
primarily	O
for	O
animated	O
3D	O
visualization	O
of	O
weather	B-General_Concept
simulations	I-General_Concept
.	O
</s>
<s>
It	O
was	O
the	O
first	O
system	O
to	O
produce	O
fully	O
interactive	O
animated	O
3D	O
displays	O
of	O
time-dynamic	O
volumetric	O
data	O
sets	O
and	O
the	O
first	O
open	O
source	O
3D	O
visualization	B-Application
system	I-Application
.	O
</s>
<s>
It	O
is	O
GNU	B-License
GPL	I-License
licensed	O
.	O
</s>
<s>
Vis5D	B-Application
was	O
created	O
in	O
response	O
to	O
two	O
circumstances	O
:	O
</s>
<s>
Output	O
data	O
from	O
weather	B-General_Concept
models	I-General_Concept
and	O
similar	O
simulations	O
are	O
sampled	O
on	O
time	O
sequences	O
of	O
regular	O
3D	O
grids	O
and	O
are	O
relatively	O
straightforward	O
to	O
visualize	O
.	O
</s>
<s>
The	O
appearance	O
in	O
1988	O
of	O
commercial	O
workstations	O
such	O
as	O
the	O
Stellar	O
GS	O
1000	O
capable	O
of	O
rendering	O
Gouraud-shaded	B-Algorithm
3D	O
graphics	O
fast	O
enough	O
for	O
smooth	O
animation	O
.	O
</s>
<s>
Vis5D	B-Application
takes	O
its	O
name	O
from	O
its	O
5D	O
array	O
containing	O
time	O
sequences	O
of	O
3D	O
spatial	O
grids	O
for	O
a	O
set	O
of	O
physical	O
parameters	O
of	O
the	O
atmosphere	O
or	O
ocean	O
.	O
</s>
<s>
Its	O
graphical	B-Application
user	I-Application
interface	I-Application
enables	O
users	O
to	O
select	O
from	O
various	O
ways	O
of	O
visualizing	O
each	O
parameter	O
(	O
e.g.	O
,	O
iso-surfaces	O
,	O
plane	O
slices	O
,	O
volume	O
renderings	O
)	O
,	O
and	O
to	O
select	O
a	O
combination	O
of	O
parameters	O
for	O
view	O
.	O
</s>
<s>
A	O
key	O
innovation	O
of	O
Vis5D	B-Application
is	O
that	O
it	O
computes	O
and	O
stores	O
the	O
geometries	O
and	O
colors	O
for	O
such	O
graphics	O
over	O
the	O
simulated	O
time	O
sequence	O
,	O
allowing	O
them	O
to	O
be	O
animated	O
quickly	O
so	O
users	O
can	O
watch	O
movies	O
of	O
their	O
simulations	O
.	O
</s>
<s>
Vis5D	B-Application
provides	O
other	O
visualization	O
techniques	O
.	O
</s>
<s>
Vis5D	B-Application
provides	O
options	O
for	O
memory	O
management	O
,	O
so	O
that	O
very	O
large	O
data	O
sets	O
can	O
be	O
visualized	O
at	O
individual	O
time	O
steps	O
without	O
the	O
need	O
to	O
compute	O
graphics	O
over	O
the	O
simulation	O
's	O
entire	O
time	O
sequence	O
,	O
while	O
smaller	O
data	O
sets	O
can	O
be	O
visualized	O
with	O
full	O
animation	O
.	O
</s>
<s>
Vis5D	B-Application
also	O
provides	O
an	O
API	B-General_Concept
enabling	O
developers	O
of	O
other	O
systems	O
to	O
incorporate	O
Vis5D	B-Application
's	O
functionality	O
.	O
</s>
<s>
This	O
API	B-General_Concept
is	O
the	O
basis	O
of	O
a	O
TCL	B-Operating_System
scripting	O
capability	O
so	O
users	O
can	O
write	O
automated	O
scripts	O
for	O
producing	O
animations	O
.	O
</s>
<s>
Vis5D	B-Application
was	O
first	O
demonstrated	O
,	O
via	O
videotape	O
,	O
at	O
the	O
December	O
1988	O
Workshop	O
on	O
Graphics	O
in	O
Meteorology	O
at	O
the	O
ECMWF	O
.	O
</s>
<s>
Vis5D	B-Application
running	O
on	O
the	O
GS	O
1000	O
was	O
the	O
first	O
visualization	B-Application
system	I-Application
to	O
provide	O
smooth	O
animation	O
of	O
3D	O
gridded	O
time-sequence	O
data	O
sets	O
with	O
interactive	O
rotation	O
.	O
</s>
<s>
Vis5D	B-Application
was	O
the	O
first	O
open-source	B-Application
3D	O
visualization	B-Application
system	I-Application
.	O
</s>
<s>
Vis5D	B-Application
is	O
a	O
natural	O
for	O
immersive	O
virtual	B-Application
reality	I-Application
and	O
was	O
adapted	O
to	O
the	O
CAVE	B-General_Concept
for	O
the	O
VROOM	O
at	O
the	O
1994	O
SIGGRAPH	O
conference	O
.	O
</s>
<s>
This	O
became	O
Cave5D	B-Application
.	O
</s>
