<s>
YafaRay	B-Language
(	O
formerly	O
YafRay	B-Language
)	O
is	O
a	O
free	B-License
and	I-License
open-source	I-License
ray	B-Algorithm
tracing	I-Algorithm
program	O
that	O
uses	O
an	O
XML	B-Protocol
scene	B-Application
description	I-Application
language	I-Application
.	O
</s>
<s>
There	O
is	O
a	O
YafaRay	B-Language
addon	O
for	O
Blender	B-Application
2.78	O
.	O
</s>
<s>
The	O
ray	B-Algorithm
tracer	I-Algorithm
is	O
licensed	O
under	O
the	O
GNU	B-Application
Lesser	I-Application
General	I-Application
Public	I-Application
License	I-Application
(	O
LGPL	B-Application
)	O
.	O
</s>
<s>
YafaRay	B-Language
's	O
predecessor	O
,	O
YafRay	B-Language
(	O
"	O
Yet	O
Another	O
Free	O
Raytracer	B-Algorithm
"	O
)	O
,	O
was	O
written	O
by	O
Alejandro	O
Conty	O
Estévez	O
,	O
and	O
was	O
first	O
released	O
in	O
July	O
2002	O
.	O
</s>
<s>
Due	O
to	O
limitations	O
of	O
the	O
original	O
software	O
design	O
,	O
the	O
YafRay	B-Language
raytracer	B-Algorithm
was	O
completely	O
rewritten	O
by	O
Mathias	O
Wein	O
.	O
</s>
<s>
The	O
first	O
stable	O
version	O
of	O
the	O
new	O
raytracer	B-Algorithm
,	O
given	O
the	O
name	O
YafaRay	B-Language
0.1.0	O
,	O
was	O
released	O
in	O
October	O
2008	O
.	O
</s>
<s>
YafaRay	B-Language
employs	O
global	B-Algorithm
illumination	I-Algorithm
using	O
Monte	O
Carlo-derived	O
approximations	O
to	O
produce	O
realistically	O
lit	O
renders	O
of	O
3D	O
scenes	O
.	O
</s>
<s>
YafaRay	B-Language
uses	O
a	O
form	O
of	O
photon	B-Application
mapping	I-Application
that	O
allows	O
for	O
caustics	O
(	O
light	O
distortion	O
produced	O
by	O
reflection	O
or	O
refraction	O
of	O
a	O
curved	O
surface	O
,	O
such	O
as	O
through	O
a	O
burning	O
glass	O
)	O
.	O
</s>
<s>
For	O
simulating	O
somewhat	O
translucent	O
materials	O
,	O
there	O
is	O
a	O
subsurface	B-Algorithm
scattering	I-Algorithm
shader	O
under	O
development	O
.	O
</s>
<s>
Depth	O
of	O
field	O
effects	O
can	O
be	O
produced	O
by	O
using	O
settings	O
for	O
focal	O
distance	O
and	O
aperture	B-General_Concept
.	O
</s>
<s>
YafaRay	B-Language
can	O
simulate	O
this	O
phenomenon	O
of	O
blurry	O
reflections	O
.	O
</s>
<s>
YafaRay	B-Language
features	O
a	O
modular	B-Architecture
structure	I-Architecture
:	O
at	O
the	O
core	O
is	O
a	O
kernel	B-Operating_System
the	O
rest	O
of	O
the	O
render	O
elements	O
(	O
scene	O
loader	O
,	O
lights	O
,	O
and	O
shaders	O
)	O
must	O
connect	O
to	O
.	O
</s>
<s>
This	O
,	O
together	O
with	O
the	O
specification	O
of	O
an	O
API	B-General_Concept
,	O
allows	O
for	O
the	O
development	O
of	O
rendering	O
plug-ins	B-Application
to	O
enable	O
the	O
use	O
of	O
YafaRay	B-Language
from	O
any	O
program	O
or	O
3D	O
suite	O
.	O
</s>
<s>
YafaRay-supported	O
software	O
includes	O
:	O
Blender	B-Application
,	O
Wings	B-Application
3D	I-Application
,	O
and	O
Aztec	O
.	O
</s>
<s>
YafaRay	B-Language
was	O
written	O
in	O
C++	B-Language
for	O
good	O
portability	O
,	O
and	O
there	O
are	O
precompiled	B-Language
binaries	O
for	O
the	O
most	O
common	O
platforms	O
:	O
Linux	B-Application
,	O
Windows	B-Application
and	O
macOS	B-Application
.	O
</s>
<s>
YafaRay	B-Language
can	O
be	O
used	O
as	O
a	O
stand-alone	O
render	O
engine	O
,	O
using	O
its	O
own	O
scene	B-Application
description	I-Application
format	I-Application
.	O
</s>
<s>
In	O
this	O
way	O
,	O
it	O
can	O
be	O
used	O
directly	O
from	O
the	O
command	B-Application
line	I-Application
,	O
it	O
can	O
be	O
called	O
by	O
a	O
script	B-Language
,	O
etc	O
.	O
</s>
<s>
There	O
are	O
also	O
provisions	O
for	O
parallel	B-Operating_System
and/or	O
distributed	B-Architecture
rendering	O
.	O
</s>
