<s>
In	O
automotive	O
design	O
,	O
a	O
class	B-Algorithm
A	I-Algorithm
surface	I-Algorithm
is	O
any	O
of	O
a	O
set	O
of	O
freeform	O
surfaces	O
of	O
high	O
efficiency	O
and	O
quality	O
.	O
</s>
<s>
Although	O
,	O
strictly	O
,	O
it	O
is	O
nothing	O
more	O
than	O
saying	O
the	O
surfaces	O
have	O
curvature	O
and	O
tangency	O
alignment	O
–	O
to	O
ideal	O
aesthetical	O
reflection	O
quality	O
,	O
many	O
people	O
interpret	O
class	B-Algorithm
A	I-Algorithm
surfaces	I-Algorithm
to	O
have	O
G2	O
(	O
or	O
even	O
G3	O
)	O
curvature	O
continuity	O
to	O
one	O
another	O
(	O
see	O
free	O
form	O
surface	O
modelling	O
)	O
.	O
</s>
<s>
Class	O
A	O
surfacing	O
is	O
done	O
using	O
computer-aided	B-Algorithm
industrial	I-Algorithm
design	I-Algorithm
applications	O
.	O
</s>
<s>
Class	B-Algorithm
A	I-Algorithm
surface	I-Algorithm
modellers	O
are	O
also	O
called	O
"	O
digital	O
sculptors	O
"	O
in	O
the	O
industry	O
.	O
</s>
<s>
A	O
common	O
method	O
of	O
working	O
is	O
to	O
start	O
with	O
a	O
prototype	O
model	O
and	O
produce	O
smooth	O
mathematical	O
Class	B-Algorithm
A	I-Algorithm
surfaces	I-Algorithm
to	O
describe	O
the	O
product	O
's	O
outer	O
body	O
.	O
</s>
<s>
Class	B-Algorithm
A	I-Algorithm
surfaces	I-Algorithm
can	O
be	O
defined	O
as	O
any	O
surface	O
,	O
that	O
has	O
styling	O
intent	O
,	O
that	O
is	O
either	O
seen	O
,	O
touched	O
,	O
or	O
both	O
and	O
mathematically	O
meets	O
the	O
definition	O
for	O
Bézier	O
.	O
</s>
<s>
In	O
automotive	O
design	O
application	O
Class	B-Algorithm
A	I-Algorithm
surfaces	I-Algorithm
are	O
created	O
on	O
all	O
visible	O
exterior	O
surfaces	O
(	O
ex	O
;	O
body	O
panels	O
,	O
bumper	O
,	O
grill	O
,	O
lights	O
etc	O
.	O
)	O
</s>
<s>
Among	O
the	O
most	O
famous	O
users	O
of	O
Autodesk	B-Algorithm
Alias	I-Algorithm
software	O
in	O
product	O
design	O
is	O
Apple	O
.	O
</s>
<s>
In	O
recent	O
years	O
Airbus	O
used	O
ICEM	B-Application
Surf	I-Application
for	O
generating	O
the	O
exterior	O
surface	O
geometry	O
for	O
Aesthetics	O
and	O
Aerodynamic	O
optimisation	O
before	O
delivering	O
the	O
surface	O
to	O
downstream	O
CAD	O
software	O
like	O
CATIA	B-Algorithm
.	O
</s>
<s>
The	O
scanned	O
data	O
of	O
a	O
selected	O
clay	O
model	O
will	O
be	O
taken	O
as	O
a	O
"	O
Point	O
cloud	O
data	O
"	O
input	O
,	O
and	O
Class	O
A	O
designers	O
work	O
on	O
this	O
Point	O
cloud	O
data	O
to	O
generate	O
preliminary	O
surfaces	O
and	O
further	O
refine	O
them	O
to	O
Class	B-Algorithm
A	I-Algorithm
surfaces	I-Algorithm
.	O
</s>
<s>
The	O
most	O
widely	O
used	O
software	O
tools	O
are	O
Alias	O
by	O
Autodesk	B-Algorithm
,	O
ICEM	B-Application
Surf	I-Application
followed	O
by	O
Imageware	O
and	O
Unigraphics	O
(	O
Class-A	O
Module	O
)	O
and	O
Catia	B-Algorithm
(	O
FreeStyle	O
Module	O
)	O
by	O
Dassault	O
systems	O
etc	O
and	O
Tebis	O
Cad/Cam	O
.	O
</s>
