<s>
BALL	O
(	O
Biochemical	O
Algorithms	O
Library	O
)	O
is	O
a	O
C++	B-Language
class	O
framework	O
and	O
set	O
of	O
algorithms	O
and	O
data	O
structures	O
for	O
molecular	O
modelling	O
and	O
computational	O
structural	O
bioinformatics	O
,	O
a	O
Python	B-Language
interface	O
to	O
this	O
library	O
,	O
and	O
a	O
graphical	B-Application
user	I-Application
interface	I-Application
to	O
BALL	O
,	O
the	O
molecule	B-Application
viewer	I-Application
BALLView	B-Language
.	O
</s>
<s>
BALL	O
has	O
evolved	O
from	O
a	O
commercial	O
product	O
into	O
free-of-charge	O
open-source	B-Application
software	I-Application
licensed	O
under	O
the	O
GNU	B-Application
Lesser	I-Application
General	I-Application
Public	I-Application
License	I-Application
(	O
LGPL	B-Application
)	O
.	O
</s>
<s>
BALLView	B-Language
is	O
licensed	O
under	O
the	O
GNU	B-License
General	I-License
Public	I-License
License	I-License
(	O
GPL	B-License
)	O
license	O
.	O
</s>
<s>
BALL	O
and	O
BALLView	B-Language
have	O
been	O
ported	O
to	O
the	O
operating	O
systems	O
Linux	B-Application
,	O
macOS	B-Application
,	O
Solaris	B-Application
,	O
and	O
Windows	O
.	O
</s>
<s>
The	O
molecule	B-Application
viewer	I-Application
BALLView	B-Language
,	O
also	O
developed	O
by	O
the	O
BALL	O
project	O
team	O
,	O
is	O
a	O
C++	B-Language
application	O
of	O
BALL	O
using	O
Qt	B-Language
,	O
and	O
OpenGL	B-Application
with	O
the	O
real-time	O
ray	O
tracer	O
RTFact	O
as	O
render	O
back-ends	O
.	O
</s>
<s>
For	O
both	O
,	O
BALLView	B-Language
offers	O
three-dimensional	O
and	O
stereoscopic	O
visualizing	O
in	O
several	O
different	O
modes	O
,	O
and	O
applying	O
directly	O
the	O
algorithms	O
of	O
the	O
BALL	O
library	O
via	O
its	O
graphical	B-Application
user	I-Application
interface	I-Application
.	O
</s>
<s>
SIP	O
is	O
used	O
to	O
automatically	O
create	O
Python	B-Language
classes	O
for	O
all	O
relevant	O
C++	B-Language
classes	O
in	O
the	O
BALL	O
library	O
to	O
allow	O
for	O
the	O
same	O
class	O
interfaces	O
.	O
</s>
<s>
The	O
Python	B-Language
classes	O
have	O
the	O
same	O
name	O
as	O
the	O
C++	B-Language
classes	O
,	O
to	O
aid	O
in	O
porting	O
code	O
that	O
uses	O
BALL	O
from	O
C++	B-Language
to	O
Python	B-Language
,	O
and	O
vice	O
versa	O
.	O
</s>
<s>
The	O
Python	B-Language
interface	O
is	O
fully	O
integrated	O
into	O
the	O
viewer	O
application	O
BALLView	B-Language
and	O
thus	O
allows	O
for	O
direct	O
visualization	O
of	O
results	O
computed	O
by	O
python	B-Language
scripts	I-Language
.	O
</s>
<s>
Also	O
,	O
BALLView	B-Language
can	O
be	O
operated	O
from	O
the	O
scripting	O
interface	O
and	O
recurring	O
tasks	O
can	O
be	O
automated	O
.	O
</s>
<s>
BALLView	B-Language
is	O
BALL	O
's	O
standalone	O
molecule	O
modeling	O
and	O
visualization	O
application	O
.	O
</s>
<s>
BALLView	B-Language
offers	O
standard	O
visualization	O
models	O
for	O
atoms	O
,	O
bonds	O
,	O
surfaces	O
,	O
and	O
grid	O
based	O
visualization	O
of	O
e.g.	O
,	O
electrostatic	O
potentials	O
.	O
</s>
<s>
A	O
large	O
part	O
of	O
the	O
functionality	O
of	O
the	O
library	O
BALL	O
can	O
be	O
applied	O
directly	O
to	O
the	O
loaded	O
molecule	O
in	O
BALLView	B-Language
.	O
</s>
<s>
BALLView	B-Language
supports	O
several	O
visualization	O
and	O
input	O
methods	O
such	O
as	O
different	O
stereo	O
modes	O
,	O
space	O
navigator	O
,	O
and	O
VRPN-supported	O
Input	O
devices	O
.	O
</s>
<s>
At	O
CeBIT	O
2009	O
,	O
BALLView	B-Language
was	O
prominently	O
presented	O
as	O
the	O
first	O
complete	O
integration	O
of	O
real-time	O
ray	O
tracing	O
technology	O
into	O
a	O
molecular	O
viewer	O
and	O
modeling	O
tool	O
.	O
</s>
