<s>
Papervision3D	B-Application
is	O
an	O
open-source	B-Application
,	O
3D	O
graphics	O
engine	O
for	O
rendering	O
3D	O
content	O
within	O
Adobe	B-Operating_System
Flash	I-Operating_System
Player	I-Operating_System
and	O
Adobe	B-Operating_System
AIR	I-Operating_System
.	O
</s>
<s>
Unlike	O
modern	O
Flash	O
3D	O
engines	O
such	O
as	O
Away3D	B-Application
and	O
Flare3D	B-Operating_System
,	O
Papervision3D	B-Application
is	O
not	O
built	O
for	O
Stage3D	B-Operating_System
and	O
renders	O
3D	O
content	O
fully	O
on	O
the	O
CPU	O
without	O
GPU-accelerated	O
rendering	O
.	O
</s>
<s>
Papervision3D	B-Application
was	O
launched	O
by	O
Carlos	O
Ulloa	O
around	O
December	O
2005	O
;	O
it	O
was	O
made	O
open	O
source	O
by	O
the	O
end	O
of	O
2006	O
.	O
</s>
<s>
Papervision3D	B-Application
was	O
of	O
the	O
first	O
3D	O
rendering	O
engines	O
built	O
for	O
Adobe	B-Operating_System
Flash	I-Operating_System
Player	I-Operating_System
,	O
and	O
at	O
the	O
time	O
of	O
its	O
launch	O
in	O
2005	O
,	O
was	O
the	O
most	O
complete	O
and	O
best	O
known	O
3D	O
engine	O
for	O
Flash	O
.	O
</s>
<s>
It	O
used	O
drawTriangles( )	O
to	O
render	O
3D	O
content	O
fully	O
on	O
the	O
CPU	O
,	O
within	O
Flash	B-Operating_System
Player	I-Operating_System
.	O
</s>
<s>
According	O
to	O
a	O
2009	O
book	O
Papervision3D	B-Application
was	O
"	O
without	O
a	O
doubt	O
the	O
best	O
known	O
"	O
3D	O
engine	O
for	O
Flash	O
.	O
</s>
<s>
A	O
2012	O
book	O
called	O
it	O
the	O
"	O
granddaddy	O
of	O
3D	O
libraries	O
for	O
Flash	O
"	O
and	O
argued	O
that	O
"	O
There	O
is	O
a	O
simple	O
reason	O
for	O
PaperVision3D	B-Application
's	O
popularity	O
:	O
it	O
is	O
very	O
complete	O
in	O
its	O
execution.	O
"	O
</s>
<s>
Away3D	B-Application
was	O
forked	B-Application
from	O
Papervision3D	B-Application
,	O
for	O
the	O
purpose	O
of	O
improving	O
performance	O
.	O
</s>
<s>
Another	O
2011	O
book	O
noted	O
in	O
the	O
section	O
on	O
"	O
3D	O
with	O
Flash	O
"	O
that	O
"	O
Away3D	B-Application
and	O
Alternativa3D	O
are	O
currently	O
the	O
preferred	O
solution	O
for	O
performance	O
and	O
features	O
because	O
they	O
have	O
a	O
more	O
active	O
development	O
community	O
"	O
.	O
</s>
<s>
Although	O
popular	O
between	O
its	O
introduction	O
in	O
2006	O
and	O
2009	O
,	O
development	O
has	O
stopped	O
since	O
2009	O
and	O
it	O
has	O
been	O
superseded	O
by	O
Away3D	B-Application
which	O
has	O
been	O
adopted	O
by	O
Adobe	O
as	O
the	O
sole	O
3D	O
rendering	O
engine	O
included	O
within	O
the	O
official	O
Adobe	O
Gaming	O
SDK	O
.	O
</s>
