<s>
id	B-Application
Tech	I-Application
5	I-Application
is	O
a	O
proprietary	B-Application
game	O
engine	O
developed	O
by	O
id	O
Software	O
.	O
</s>
<s>
It	O
followed	O
its	O
predecessors	O
,	O
id	B-Application
Tech	I-Application
1	I-Application
,	O
2	B-Application
,	O
3	B-Application
and	O
4	B-Application
,	O
all	O
of	O
which	O
had	O
subsequently	O
been	O
published	O
under	O
the	O
GNU	B-License
General	I-License
Public	I-License
License	I-License
.	O
</s>
<s>
It	O
was	O
seen	O
as	O
a	O
major	O
advancement	O
over	O
id	B-Application
Tech	I-Application
4	I-Application
.	O
</s>
<s>
The	O
engine	O
was	O
first	O
demonstrated	O
at	O
the	O
WWDC	O
2007	O
by	O
John	O
D	O
.	O
Carmack	O
on	O
an	O
eight-core	O
computer	O
;	O
however	O
,	O
the	O
demo	O
used	O
only	O
a	O
single	O
core	O
with	O
single-threaded	B-Operating_System
OpenGL	B-Application
implementation	O
running	O
on	O
a	O
512MB	O
7000	O
class	O
Quadro	B-Application
video	O
card	O
.	O
</s>
<s>
id	B-Application
Tech	I-Application
5	I-Application
was	O
first	O
used	O
in	O
the	O
video	O
game	O
Rage	B-Application
,	O
followed	O
by	O
Wolfenstein	B-Application
:	I-Application
The	I-Application
New	I-Application
Order	I-Application
,	O
The	B-Application
Evil	I-Application
Within	I-Application
and	O
Wolfenstein	B-Application
:	I-Application
The	I-Application
Old	I-Application
Blood	I-Application
.	O
</s>
<s>
It	O
was	O
followed	O
up	O
by	O
id	B-Operating_System
Tech	I-Operating_System
6	I-Operating_System
.	O
</s>
<s>
In	O
contrast	O
,	O
id	B-Application
Tech	I-Application
4	I-Application
,	O
which	O
featured	O
volume-based	O
shadows	O
,	O
had	O
very	O
sharply	O
defined	O
shadows	O
.	O
</s>
<s>
Numerous	O
other	O
advanced	O
graphical	O
effects	O
such	O
as	O
various	O
materials	O
for	O
lighting	O
,	O
high	O
dynamic	O
range	O
rendering-centric	O
effects	O
,	O
bloom	O
,	O
crepuscular	O
rays	O
(	O
volumetric	B-General_Concept
lighting	I-General_Concept
)	O
,	O
radiosity	O
,	O
soft	O
particles	O
,	O
pixel	O
shader	O
effects	O
,	O
alpha	B-Algorithm
to	I-Algorithm
coverage	I-Algorithm
,	O
post	O
processing	O
,	O
Screen	O
Space	O
Reflection	O
,	O
dynamic	O
water	O
surfaces	O
,	O
procedural	O
animation	O
,	O
cloth	O
simulation	O
,	O
depth	O
of	O
field	O
,	O
and	O
motion	O
blur	O
,	O
are	O
contained	O
.	O
</s>
<s>
Multi-threaded	B-Operating_System
processing	O
on	O
the	O
CPU	O
is	O
done	O
for	O
many	O
of	O
its	O
tasks	O
,	O
including	O
rendering	O
,	O
game	O
logic	O
,	O
AI	O
,	O
physics	O
,	O
and	O
sound	O
processing	O
.	O
</s>
<s>
Previously	O
,	O
content	O
creation	O
required	O
artists	O
to	O
run	O
various	O
command-line	O
tools	O
beyond	O
the	O
level	O
editor	O
's	O
own	O
tools	O
,	O
while	O
id	B-Application
Tech	I-Application
5	I-Application
allows	O
for	O
all	O
work	O
to	O
be	O
done	O
'	O
in-engine	O
'	O
.	O
</s>
<s>
An	O
interview	O
with	O
John	O
Carmack	O
,	O
the	O
lead	O
graphics	O
engine	O
developer	O
at	O
id	O
(	O
at	O
the	O
time	O
)	O
,	O
indicated	O
that	O
like	O
its	O
predecessors	O
,	O
id	B-Application
Tech	I-Application
5	I-Application
would	O
eventually	O
be	O
released	O
as	O
open-source	B-Application
.	O
</s>
<s>
The	O
move	O
to	O
open	O
source	O
would	O
likely	O
come	O
many	O
years	O
after	O
id	B-Application
Tech	I-Application
5	I-Application
's	O
release	O
as	O
a	O
proprietary	B-Application
engine	O
.	O
</s>
<s>
At	O
QuakeCon	O
2007	O
,	O
Carmack	O
told	O
LinuxGames	O
that	O
he	O
would	O
integrate	O
as	O
little	O
proprietary	B-Application
software	I-Application
as	O
possible	O
into	O
id	B-Application
Tech	I-Application
5	I-Application
,	O
as	O
"	O
eventually	O
id	B-Application
Tech	I-Application
5	I-Application
is	O
going	O
to	O
be	O
open	O
source	O
also	O
.	O
</s>
<s>
Carmack	O
resigned	O
from	O
id	O
in	O
2013	O
,	O
and	O
no	O
source	O
code	O
release	O
followed	O
the	O
launch	O
of	O
id	B-Operating_System
Tech	I-Operating_System
6	I-Operating_System
in	O
2016	O
.	O
</s>
<s>
At	O
QuakeCon	O
2010	O
,	O
id	O
CEO	O
Todd	O
Hollenshead	O
announced	O
that	O
while	O
id	B-Application
Tech	I-Application
5	I-Application
could	O
be	O
shared	O
with	O
internal	O
ZeniMax	O
Media	O
developers	O
,	O
the	O
engine	O
will	O
not	O
be	O
available	O
for	O
external	O
licensing	O
.	O
</s>
<s>
During	O
the	O
development	O
of	O
Dishonored	B-Application
2	I-Application
,	O
Arkane	O
Studios	O
rewrote	O
majority	O
of	O
the	O
id	B-Application
tech	I-Application
5	I-Application
for	O
purposes	O
required	O
for	O
the	O
development	O
of	O
the	O
game	O
.	O
</s>
<s>
The	O
new	O
engine	O
is	O
intended	O
to	O
improve	O
in-game	O
lighting	O
and	O
post-processing	O
to	O
help	O
the	O
game	O
's	O
visuals	O
,	O
and	O
allows	O
the	O
game	O
to	O
visualize	O
subsurface	B-Algorithm
scattering	I-Algorithm
.	O
</s>
<s>
During	O
the	O
development	O
of	O
The	B-Application
Evil	I-Application
Within	I-Application
,	O
Tango	O
Gameworks	O
has	O
also	O
made	O
changes	O
to	O
the	O
id	B-Application
tech	I-Application
5	I-Application
engine	I-Application
,	O
adding	O
tessellation	O
and	O
new	O
dynamic	O
renderer	O
enabling	O
dynamic	O
lighting	O
to	O
the	O
game	O
.	O
</s>
<s>
And	O
during	O
the	O
development	O
of	O
The	B-Application
Evil	I-Application
Within	I-Application
2	I-Application
further	O
changes	O
have	O
been	O
added	O
,	O
and	O
the	O
new	O
version	O
of	O
the	O
engine	O
was	O
named	O
"	O
Stem	O
"	O
engine	O
.	O
</s>
