<s>
Panther	B-Application
,	O
a	O
battle	O
tank-driving	O
simulation	O
named	O
after	O
the	O
Panther	B-Application
tank	O
,	O
was	O
one	O
of	O
a	O
handful	O
of	O
early	O
first-person	O
computer	O
games	O
developed	O
by	O
John	O
Edo	O
Haefeli	O
and	O
Nelson	O
Bridwell	O
in	O
1975	O
at	O
Northwestern	O
University	O
.	O
</s>
<s>
The	O
game	O
was	O
developed	O
for	O
the	O
multi-user	O
interactive	O
computer-based	O
education	O
PLATO	B-Operating_System
system	I-Operating_System
and	O
programmed	O
in	O
the	O
TUTOR	B-Language
programming	I-Language
language	I-Language
and	O
utilized	O
scalable	O
vector	O
graphics	O
called	O
linesets	O
.	O
</s>
<s>
A	O
1977	O
development	O
of	O
Panther	B-Application
,	O
with	O
more	O
refined	O
graphics	O
,	O
was	O
named	O
Panzer	B-Application
,	O
the	O
German	O
word	O
for	O
armour	O
and	O
tank	O
.	O
</s>
<s>
Nelson	O
also	O
provided	O
the	O
Panther	B-Application
tank	O
artwork	O
,	O
the	O
vehicle	O
motion	O
,	O
view	O
,	O
and	O
damage	O
equations	O
,	O
and	O
a	O
significant	O
fraction	O
of	O
the	O
original	O
code	O
.	O
</s>
<s>
John	O
was	O
a	O
highly	O
capable	O
TUTOR	B-Language
IV	O
programmer	O
who	O
created	O
the	O
overall	O
game	O
framework	O
,	O
providing	O
key	O
features	O
such	O
as	O
team	O
selection	O
and	O
messaging	O
that	O
turned	O
the	O
concept	O
into	O
a	O
working	O
game	O
,	O
later	O
adding	O
a	O
number	O
of	O
refinements	O
.	O
</s>
<s>
Version	O
A	O
(	O
1975	O
)	O
of	O
Panther	B-Application
has	O
recently	O
been	O
restored	O
to	O
active	O
status	O
on	O
the	O
Cyber1	O
CYBIS-based	O
(	O
a	O
PLATO	B-Operating_System
descendant	O
)	O
system	O
,	O
with	O
direct	O
permission	O
of	O
the	O
developer	O
.	O
</s>
<s>
Perspective	O
is	O
maintained	O
by	O
the	O
use	O
of	O
scalable	O
vector	O
graphics	O
and	O
visual	O
interest	O
is	O
enhanced	O
with	O
special	O
graphics	O
for	O
explosions	O
using	O
a	O
custom	O
character	O
set	O
to	O
accomplish	O
limited	O
raster	B-Algorithm
graphics	I-Algorithm
animation	O
.	O
</s>
