<s>
Shader	B-General_Concept
lamps	I-General_Concept
is	O
a	O
computer	O
graphic	O
technique	O
used	O
to	O
change	O
the	O
appearance	O
of	O
physical	O
objects	O
.	O
</s>
<s>
The	O
still	O
or	O
moving	O
objects	O
are	O
illuminated	O
,	O
using	O
one	O
or	O
more	O
video	B-Device
projectors	I-Device
,	O
by	O
static	O
or	O
animated	O
texture	O
or	O
video	B-Application
stream	I-Application
.	O
</s>
<s>
The	O
method	O
was	O
invented	O
at	O
University	O
of	O
North	O
Carolina	O
at	O
Chapel	O
Hill	O
by	O
Ramesh	O
Raskar	O
,	O
Greg	O
Welch	O
,	O
Kok-lim	O
Low	O
and	O
Deepak	O
Bandyopadhyay	O
in	O
1999	O
as	O
a	O
follow	O
on	O
to	O
Spatial	B-General_Concept
Augmented	I-General_Concept
Reality	I-General_Concept
also	O
invented	O
at	O
University	O
of	O
North	O
Carolina	O
at	O
Chapel	O
Hill	O
in	O
1998	O
by	O
Ramesh	O
Raskar	O
,	O
Greg	O
Welch	O
and	O
Henry	O
Fuchs	O
.	O
</s>
<s>
The	O
objects	O
are	O
typically	O
replaced	O
by	O
neutral	O
color	O
ones	O
,	O
the	O
projection	O
giving	O
all	O
its	O
visual	O
properties	O
,	O
thus	O
the	O
name	O
shader	B-General_Concept
lamps	I-General_Concept
.	O
</s>
