<s>
Renderman	B-Application
Shading	I-Application
Language	I-Application
(	O
abbreviated	O
RSL	O
)	O
is	O
a	O
component	O
of	O
the	O
RenderMan	B-Application
Interface	I-Application
Specification	I-Application
,	O
and	O
is	O
used	O
to	O
define	O
shaders	O
.	O
</s>
<s>
The	O
language	O
syntax	O
is	O
C-like	B-Language
.	O
</s>
<s>
A	O
shader	O
written	O
in	O
RSL	O
can	O
be	O
used	O
without	O
changes	O
on	O
any	O
RenderMan-compliant	O
renderer	O
,	O
such	O
as	O
Pixar	O
's	O
PhotoRealistic	B-Application
RenderMan	I-Application
,	O
DNA	O
Research	O
's	O
3Delight	B-Application
,	O
Sitexgraphics	O
 '	O
Air	O
or	O
an	O
open	O
source	O
solution	O
such	O
as	O
Pixie	B-Application
or	O
Aqsis	B-Application
.	O
</s>
<s>
RenderMan	B-Application
Shading	I-Application
Language	I-Application
defines	O
standalone	O
functions	O
and	O
five	O
types	O
of	O
shaders	O
:	O
surface	O
,	O
light	O
,	O
volume	O
,	O
imager	O
and	O
displacement	O
shaders	O
.	O
</s>
<s>
Shaders	O
express	O
their	O
work	O
by	O
reading	O
and	O
writing	O
special	O
variables	O
such	O
as	O
Cs	B-Language
(	O
surface	O
color	O
)	O
,	O
N	O
(	O
normal	O
at	O
given	O
point	O
)	O
,	O
and	O
Ci	O
(	O
final	O
surface	O
color	O
)	O
.	O
</s>
