<s>
AMD	O
TressFX	B-Application
is	O
a	O
software	O
library	O
which	O
provides	O
for	O
advanced	O
simulation	B-Application
and	O
rendering	O
of	O
hair	O
,	O
fur	O
,	O
and	O
grass	O
to	O
be	O
processed	O
by	O
the	O
GPU	B-Architecture
.	O
</s>
<s>
The	O
initial	O
library	O
was	O
written	O
to	O
perform	O
well	O
on	O
AMD	O
's	O
GCN-based	O
products	O
.	O
</s>
<s>
Version	O
3	O
was	O
released	O
on	O
January	O
26	O
,	O
2016	O
,	O
and	O
works	O
solely	O
with	O
Direct3D	O
11	O
and	O
utilizes	O
DirectCompute	B-Library
.	O
</s>
<s>
A	O
competing	O
solution	O
offered	O
by	O
Nvidia	O
is	O
HairWorks	O
which	O
is	O
part	O
of	O
their	O
Nvidia	B-Application
GameWorks	I-Application
suite	O
and	O
is	O
proprietary	O
in	O
nature	O
.	O
</s>
<s>
Released	O
as	O
part	O
of	O
GPUOpen	B-Application
AMD	O
TressFX	B-Application
is	O
free	B-License
and	I-License
open-source	I-License
software	I-License
subject	O
to	O
the	B-License
MIT	I-License
License	I-License
.	O
</s>
<s>
In	O
order	O
to	O
overcome	O
this	O
,	O
AMD	O
developed	O
TressFX	B-Application
Hair	O
.	O
</s>
<s>
TressFX	B-Application
Hair	O
models	O
each	O
of	O
potentially	O
thousands	O
of	O
strands	O
of	O
hair	O
individually	O
with	O
dozens	O
of	O
links	O
per	O
strand	O
of	O
hair	O
.	O
</s>
<s>
Because	O
simulating	O
thousands	O
of	O
strands	O
of	O
hair	O
is	O
much	O
more	O
computationally	O
intense	O
than	O
displaying	O
a	O
texture	O
over	O
a	O
character	O
's	O
skeleton	O
,	O
the	O
impact	O
of	O
TressFX	B-Application
Hair	O
on	O
game	O
performance	O
and	O
frame	O
rates	O
may	O
not	O
be	O
trivial	O
.	O
</s>
<s>
High	O
performance	O
video	B-Device
cards	I-Device
may	O
have	O
enough	O
resources	O
available	O
that	O
the	O
extra	O
effort	O
of	O
rendering	O
hair	O
may	O
produce	O
negligible	O
or	O
acceptable	O
frame	O
rate	O
losses	O
.	O
</s>
<s>
Conversely	O
,	O
older	O
video	B-Device
cards	I-Device
may	O
spend	O
a	O
large	O
proportion	O
of	O
each	O
frame	O
's	O
render	O
time	O
rendering	O
hair	O
,	O
and	O
this	O
can	O
noticeably	O
reduce	O
game	O
performance	O
.	O
</s>
<s>
Of	O
course	O
,	O
performance	O
is	O
interrelated	O
with	O
other	O
game	O
settings	O
,	O
resolution	O
,	O
the	O
number	O
of	O
objects	O
with	O
hair	O
to	O
be	O
rendered	O
in	O
the	O
screen	B-Device
,	O
amount	O
of	O
hair	O
per	O
object	O
,	O
and	O
distance	O
from	O
the	O
object	O
.	O
</s>
<s>
TressFX	B-Application
Hair	O
1.0	O
was	O
AMD	O
's	O
first	O
release	O
of	O
this	O
software	O
in	O
2013	O
.	O
</s>
<s>
The	O
first	O
game	O
to	O
use	O
TressFX	B-Application
Hair	O
was	O
the	O
2013	O
game	O
Tomb	B-Application
Raider	I-Application
.	O
</s>
<s>
Continuous	O
Level	O
of	O
detail	O
(	O
LOD	O
)	O
is	O
designed	O
to	O
improve	O
performance	O
by	O
dynamically	O
adjusting	O
visual	O
detail	O
as	O
TressFX-enabled	O
objects	O
move	O
towards	O
and	O
away	O
from	O
the	O
player	O
's	O
point	O
of	O
view	O
.	O
</s>
<s>
Renderings	O
produced	O
by	O
TressFX	B-Application
1.0	O
however	O
did	O
not	O
do	O
this	O
,	O
and	O
so	O
the	O
hair	O
looks	O
unnaturally	O
separated	O
.	O
</s>
<s>
Even	O
more	O
robust	O
scalability	O
across	O
GPUs	B-Architecture
of	O
varying	O
performance	O
envelopes	O
(	O
vs	O
.	O
TressFX	B-Application
1.0	O
)	O
.	O
</s>
<s>
Modular	B-Architecture
code	O
and	O
porting	O
documentation	O
.	O
</s>
<s>
The	O
first	O
game	O
confirmed	O
to	O
use	O
TressFX	B-Application
3.0	O
is	O
Deus	B-Application
Ex	I-Application
:	I-Application
Mankind	I-Application
Divided	I-Application
.	O
</s>
<s>
Version	O
4.0	O
of	O
TressFX	B-Application
was	O
released	O
on	O
the	O
20	O
.	O
</s>
<s>
PureHair	O
is	O
a	O
version	O
of	O
TressFX	B-Application
modified	O
by	O
Square	O
Enix	O
for	O
use	O
in	O
Rise	B-Application
of	I-Application
the	I-Application
Tomb	I-Application
Raider	I-Application
.	O
</s>
