<s>
Polynomial	B-Algorithm
texture	I-Algorithm
mapping	I-Algorithm
(	O
PTM	O
)	O
,	O
also	O
known	O
as	O
Reflectance	B-Algorithm
Transformation	I-Algorithm
Imaging	I-Algorithm
(	O
RTI	O
)	O
,	O
is	O
a	O
technique	O
of	O
imaging	B-Algorithm
and	O
interactively	O
displaying	O
objects	O
under	O
varying	O
lighting	O
conditions	O
to	O
reveal	O
surface	O
phenomena	O
.	O
</s>
<s>
Interactive	O
software	O
processes	O
and	O
combines	O
the	O
set	O
of	O
images	O
to	O
enable	O
the	O
user	O
inspecting	O
the	O
object	O
to	O
control	O
a	O
virtual	B-General_Concept
light	O
source	O
.	O
</s>
<s>
The	O
virtual	B-General_Concept
light	O
source	O
may	O
be	O
manipulated	O
to	O
simulate	O
light	O
from	O
different	O
angles	O
and	O
of	O
different	O
intensity	O
or	O
wavelengths	O
to	O
illuminate	O
the	O
surface	O
of	O
artefacts	O
and	O
reveal	O
details	O
.	O
</s>
<s>
Polynomial	B-Algorithm
texture	I-Algorithm
mapping	I-Algorithm
may	O
be	O
used	O
for	O
detailed	O
recording	O
and	O
documentation	O
,	O
3D	O
modeling	O
,	O
edge	B-Algorithm
detection	I-Algorithm
,	O
and	O
to	O
aid	O
the	O
study	O
of	O
inscriptions	O
,	O
rock	O
art	O
and	O
other	O
artefacts	O
.	O
</s>
<s>
The	O
technique	O
is	O
now	O
also	O
finding	O
uses	O
in	O
the	O
field	O
of	O
forensic	O
science	O
,	O
for	O
example	O
in	O
imaging	B-Algorithm
footprints	O
,	O
tyre	O
marks	O
,	O
and	O
indented	O
writing	O
.	O
</s>
