<s>
Rayshade	B-Algorithm
is	O
a	O
software	O
application	O
for	O
ray	B-Algorithm
tracing	I-Algorithm
(	O
3D	O
rendering	O
)	O
from	O
a	O
text	O
3D	O
model	O
description	O
input	O
file	O
into	O
a	O
finished	O
,	O
realistic	O
image	O
.	O
</s>
<s>
It	O
is	O
written	O
by	O
Craig	O
E	O
.	O
Kolb	O
in	O
C	B-Language
,	O
yacc	B-Application
,	O
and	O
lex	B-General_Concept
.	O
</s>
<s>
It	O
runs	O
on	O
many	O
different	O
Unix	B-Application
platforms	O
,	O
and	O
was	O
also	O
later	O
ported	O
to	O
the	O
DOS	B-Device
operating	O
system	O
.	O
</s>
<s>
It	O
does	O
not	O
have	O
a	O
graphical	B-Application
user	I-Application
interface	I-Application
.	O
</s>
