<s>
Surface	B-Application
Evolver	I-Application
is	O
an	O
interactive	O
program	O
for	O
the	O
study	O
of	O
surfaces	O
shaped	O
by	O
surface	O
tension	O
and	O
other	O
energies	O
,	O
and	O
subject	O
to	O
various	O
constraints	O
.	O
</s>
<s>
The	O
Evolver	O
evolves	O
the	O
surface	O
toward	O
minimal	O
energy	O
by	O
a	O
gradient	B-Algorithm
descent	I-Algorithm
method	I-Algorithm
.	O
</s>
<s>
The	O
Evolver	O
can	O
handle	O
arbitrary	O
topology	B-Architecture
,	O
volume	O
constraints	O
,	O
boundary	O
constraints	O
,	O
boundary	O
contact	O
angles	O
,	O
prescribed	O
mean	O
curvature	O
,	O
crystalline	O
integrands	O
,	O
gravity	O
,	O
and	O
constraints	O
expressed	O
as	O
surface	O
integrals	O
.	O
</s>
<s>
The	O
surface	O
can	O
be	O
in	O
an	O
ambient	O
space	O
of	O
arbitrary	O
dimension	O
,	O
which	O
can	O
have	O
a	O
Riemannian	B-Architecture
metric	I-Architecture
,	O
and	O
the	O
ambient	O
space	O
can	O
be	O
a	O
quotient	O
space	O
under	O
a	O
group	O
action	O
.	O
</s>
