<s>
Retopology	B-General_Concept
(	O
or	O
retopo	B-General_Concept
)	O
is	O
a	O
step	O
in	O
the	O
3D	O
modeling	O
process	O
where	O
an	O
object	O
's	O
polygonal	B-Algorithm
mesh	I-Algorithm
is	O
modified	O
or	O
recreated	O
to	O
obtain	O
a	O
cleaner	O
layout	O
while	O
maintaining	O
nearly	O
the	O
same	O
physical	O
shape	O
of	O
the	O
model	O
.	O
</s>
<s>
Owing	O
to	O
its	O
complexity	O
,	O
retopology	B-General_Concept
is	O
currently	O
a	O
mostly	O
manual	O
process	O
but	O
tools	O
exist	O
to	O
assist	O
3D	O
artists	O
with	O
the	O
workflow	O
.	O
</s>
<s>
Automated	O
and	O
semi-automated	O
retopology	B-General_Concept
algorithms	O
are	O
an	O
active	O
field	O
of	O
research	O
;	O
state-of-the-art	O
techniques	O
provide	O
good	O
results	O
in	O
some	O
,	O
but	O
not	O
all	O
,	O
cases	O
.	O
</s>
<s>
Most	O
organically-shaped	O
models	O
,	O
especially	O
those	O
that	O
are	O
animated	O
or	O
used	O
in	O
real-time	O
applications	O
,	O
must	O
be	O
created	O
with	O
clean	O
topology	B-Architecture
to	O
render	O
and	O
perform	O
with	O
good	O
results	O
.	O
</s>
