<s>
Pixie	B-Application
is	O
a	O
free	B-Application
(	O
open	O
source	O
)	O
,	O
photorealistic	O
raytracing	B-Algorithm
renderer	O
for	O
generating	O
photorealistic	O
images	O
,	O
developed	O
by	O
Okan	O
Arikan	O
in	O
the	O
Department	O
of	O
Computer	O
Science	O
at	O
The	O
University	O
of	O
Texas	O
At	O
Austin	O
.	O
</s>
<s>
It	O
is	O
RenderMan-compliant	O
(	O
meaning	O
it	O
reads	O
conformant	O
RIB	O
,	O
and	O
supports	O
full	O
SL	O
shading	O
language	O
shaders	O
)	O
and	O
is	O
based	O
on	O
the	O
Reyes	O
rendering	O
architecture	O
,	O
but	O
also	O
support	O
raytracing	B-Algorithm
for	O
hidden	O
surface	O
determination	O
.	O
</s>
<s>
Like	O
the	O
proprietary	O
BMRT	B-Application
,	O
Pixie	B-Application
is	O
popular	O
with	O
students	O
learning	O
the	O
RenderMan	B-Application
Interface	I-Application
,	O
and	O
is	O
a	O
suitable	O
replacement	O
for	O
it	O
.	O
</s>
<s>
Contributions	O
to	O
Pixie	B-Application
are	O
facilitated	O
by	O
SourceForge	B-Application
and	O
the	O
Internet	O
where	O
it	O
can	O
also	O
be	O
downloaded	O
free	B-Application
of	O
charge	O
as	O
source	O
code	O
or	O
precompiled	O
.	O
</s>
<s>
It	O
compiles	O
for	O
Windows	B-Application
(	O
using	O
Visual	B-Application
Studio	I-Application
2005	O
)	O
,	O
Linux	B-Application
and	O
on	O
Mac	B-Operating_System
OS	I-Operating_System
X	I-Operating_System
(	O
using	O
Xcode	B-Operating_System
or	O
Unix-style	O
configure	O
script	O
)	O
.	O
</s>
<s>
Programmable	O
shading	O
(	O
using	O
RenderMan	B-Application
Shading	O
Language	O
)	O
including	O
full	O
displacement	O
support	O
.	O
</s>
<s>
Scalable	O
,	O
multi-resolution	O
raytracing	B-Algorithm
using	O
ray	O
differentials	O
.	O
</s>
<s>
Global	B-Algorithm
illumination	I-Algorithm
.	O
</s>
<s>
Pixie	B-Application
is	O
developed	O
by	O
Okan	O
Arikan	O
and	O
George	O
Harker	O
.	O
</s>
