<s>
Blend4Web	B-Application
is	O
a	O
free	B-License
and	O
open	B-Application
source	I-Application
framework	B-Architecture
for	O
creating	O
and	O
displaying	O
interactive	B-General_Concept
3D	O
computer	O
graphics	O
in	O
web	B-Application
browsers	I-Application
.	O
</s>
<s>
The	O
Blend4Web	B-Application
framework	B-Architecture
leverages	O
Blender	B-Application
to	O
edit	O
3D	O
scenes	O
.	O
</s>
<s>
Content	O
rendering	O
relies	O
on	O
WebGL	B-Library
,	O
Web	B-Language
Audio	I-Language
,	O
WebVR	O
,	O
and	O
other	O
web	O
standards	O
,	O
without	O
the	O
use	O
of	O
plug-ins	B-Application
.	O
</s>
<s>
It	O
is	O
dual-licensed	B-License
and	O
is	O
distributed	O
under	O
the	O
free	B-License
and	O
open	B-Application
source	I-Application
GPLv3	O
and	O
a	O
non-free	B-Application
license	O
;	O
the	O
source	O
code	O
is	O
hosted	O
on	O
GitHub	B-Application
.	O
</s>
<s>
A	O
3D	O
scene	O
can	O
be	O
prepared	O
in	O
Blender	B-Application
and	O
then	O
exported	O
as	O
a	O
pair	O
of	O
JSON	B-General_Concept
and	O
binary	O
files	O
to	O
load	O
in	O
a	O
web	B-Application
application	I-Application
.	O
</s>
<s>
It	O
can	O
also	O
be	O
exported	O
as	O
a	O
single	O
,	O
self-contained	O
HTML	B-Language
file	I-Language
,	O
in	O
which	O
exported	O
data	O
,	O
the	O
web	O
player	O
GUI	B-Application
and	O
the	O
engine	O
itself	O
are	O
packed	O
.	O
</s>
<s>
The	O
HTML	B-Language
option	O
is	O
considered	O
to	O
be	O
the	O
simplest	O
way	O
.	O
</s>
<s>
The	O
resulting	O
file	O
,	O
which	O
has	O
a	O
minimum	O
size	O
of	O
1	O
MB	O
,	O
can	O
be	O
embedded	O
in	O
a	O
web	O
page	O
using	O
a	O
standard	O
iframe	O
HTML	B-General_Concept
element	I-General_Concept
.	O
</s>
<s>
Blend4Web-powered	O
web	B-Application
applications	I-Application
can	O
be	O
deployed	O
on	O
social	O
networking	O
websites	O
such	O
as	O
Facebook	B-Application
.	I-Application
</s>
<s>
The	O
Blend4Web	B-Application
toolchain	B-General_Concept
consists	O
of	O
JavaScript	B-Language
libraries	I-Language
,	O
the	O
Blender	B-Application
add-on	B-Application
,	O
and	O
a	O
set	O
of	O
tools	O
for	O
tweaking	B-Device
3D	O
scene	O
parameters	O
,	O
debugging	O
,	O
and	O
optimization	O
.	O
</s>
<s>
Developed	O
by	O
Moscow-based	O
company	O
Triumph	O
in	O
2010	O
,	O
Blend4Web	B-Application
was	O
publicly	O
released	O
on	O
March	O
28	O
,	O
2014	O
.	O
</s>
<s>
At	O
the	O
end	O
of	O
2017	O
,	O
the	O
project	O
founders	O
Yuri	O
and	O
Alex	O
Kovelenov	O
quit	O
Triumph	O
to	O
start	O
the	O
development	O
of	O
a	O
new	O
WebGL	B-Library
framework	B-Architecture
Verge3D	B-Language
.	O
</s>
<s>
In	O
October	O
2019	O
,	O
an	O
"	O
Absolutely	O
new	O
Blend4Web	B-Application
"	O
was	O
announced	O
,	O
planned	O
to	O
make	O
developing	O
3D	O
apps	O
easier	O
and	O
to	O
add	O
a	O
new	O
marketplace	O
where	O
people	O
can	O
offer	O
their	O
3D	O
models	O
.	O
</s>
<s>
The	O
framework	B-Architecture
has	O
a	O
number	O
of	O
components	O
typically	O
found	O
in	O
game	O
engines	O
,	O
including	O
a	O
positional	B-Application
audio	I-Application
system	O
,	O
physics	O
engine	O
(	O
a	O
fork	B-Application
of	O
Bullet	B-Application
ported	O
to	O
JavaScript	B-Language
)	O
,	O
animation	O
system	O
,	O
and	O
an	O
abstraction	B-Application
layer	O
for	O
game	O
logic	O
programming	O
.	O
</s>
<s>
The	O
speed	O
and	O
the	O
direction	O
of	O
animation	O
(	O
forward/backward	O
play	O
)	O
,	O
as	O
well	O
as	O
particle	O
system	O
parameters	O
(	O
size	O
,	O
initial	O
velocity	O
,	O
and	O
count	O
)	O
,	O
can	O
be	O
changed	O
through	O
the	O
API	B-Application
.	O
</s>
<s>
Among	O
other	O
supported	O
features	O
are	O
scene	O
data	O
dynamic	B-Operating_System
loading	I-Operating_System
and	O
unloading	O
,	O
subsurface	B-Algorithm
scattering	I-Algorithm
simulation	O
,	O
and	O
image-based	B-Algorithm
lighting	I-Algorithm
.	O
</s>
<s>
Being	O
based	O
on	O
the	O
cross-browser	B-Architecture
WebGL	B-Library
API	B-Application
,	O
Blend4Web	B-Application
runs	O
in	O
the	O
majority	O
of	O
web	B-Application
browsers	I-Application
,	O
including	O
mobile	O
ones	O
.	O
</s>
<s>
There	O
are	O
some	O
caveats	O
for	O
browsers	B-Application
with	O
experimental	O
WebGL	B-Library
support	O
,	O
such	O
as	O
Internet	B-Application
Explorer	I-Application
.	O
</s>
<s>
There	O
are	O
also	O
applications	O
developed	O
to	O
run	O
on	O
Tizen-powered	O
devices	O
such	O
as	O
the	O
Samsung	B-Device
Gear	I-Device
S2	I-Device
smartwatch	O
.	O
</s>
<s>
Other	O
features	O
include	O
draw	O
call	O
batching	O
,	O
hidden	B-Algorithm
surface	I-Algorithm
determination	I-Algorithm
,	O
threaded	B-Operating_System
physics	B-Algorithm
simulation	I-Algorithm
and	O
ocean	O
simulation	O
.	O
</s>
<s>
In	O
version	O
14.09	O
,	O
Blend4Web	B-Application
introduced	O
the	O
possibility	O
of	O
adding	O
interactivity	B-General_Concept
to	O
3D	O
scenes	O
using	O
a	O
visual	B-Language
programming	I-Language
tool	O
.	O
</s>
<s>
The	O
tool	O
is	O
reminiscent	O
of	O
the	O
BGE	O
's	O
logic	O
editor	O
as	O
it	O
uses	O
logic	O
blocks	O
that	O
are	O
placed	O
inside	O
Blender	B-Application
.	O
</s>
<s>
Since	O
version	O
15.03	O
,	O
Blend4Web	B-Application
has	O
supported	O
attaching	O
HTML	B-General_Concept
elements	I-General_Concept
(	O
such	O
as	O
information	O
windows	O
)	O
to	O
3D	O
objects	O
(	O
"	O
annotations	O
"	O
)	O
and	O
copying	O
objects	O
in	O
run	B-Library
time	I-Library
(	O
"	O
instancing	O
"	O
)	O
.	O
</s>
<s>
Virtual	B-Application
reality	I-Application
devices	O
have	O
been	O
supported	O
since	O
the	O
end	O
of	O
2015	O
.	O
</s>
<s>
Specifically	O
,	O
Oculus	B-Device
Rift	I-Device
head-mounted	B-General_Concept
display	I-General_Concept
works	O
over	O
experimental	O
WebVR	O
API	B-Application
.	O
</s>
<s>
The	O
software	O
also	O
now	O
includes	O
preliminary	O
support	O
for	O
gamepads	B-Device
,	O
based	O
on	O
the	O
Gamepad	B-Device
API	B-Application
.	O
</s>
<s>
In	O
2017	O
,	O
the	O
option	O
to	O
author	O
augmented	B-General_Concept
reality	I-General_Concept
content	O
was	O
added	O
.	O
</s>
<s>
The	O
system	O
is	O
based	O
on	O
the	O
open-source	B-Application
tracking	O
library	O
ARToolKit	B-General_Concept
and	O
uses	O
the	O
WebRTC	B-Protocol
protocols	O
.	O
</s>
<s>
Starting	O
from	O
version	O
17.08	O
,	O
finger	B-Algorithm
tracking	I-Algorithm
is	O
supported	O
through	O
the	O
Leap	B-General_Concept
Motion	I-General_Concept
device	O
.	O
</s>
<s>
The	O
Blender	B-Application
add-on	B-Application
is	O
written	O
in	O
Python	B-Language
and	O
C	B-Language
and	O
can	O
be	O
compiled	O
for	O
the	O
Linux	B-Application
x86/x64	O
,	O
OS	B-Operating_System
X	I-Operating_System
x64	O
,	O
and	O
MS	B-Application
Windows	I-Application
x86/x64	O
platforms	B-Device
.	O
</s>
<s>
A	O
Blend4Web-specific	O
profile	O
can	O
be	O
activated	O
in	O
the	O
add-on	B-Application
settings	O
.	O
</s>
<s>
When	O
switching	O
to	O
this	O
profile	O
,	O
the	O
Blender	B-Application
interface	O
changes	O
so	O
that	O
it	O
only	O
reveals	O
settings	O
relevant	O
to	O
Blend4Web	B-Application
.	O
</s>
<s>
Blend4Web	B-Application
supports	O
a	O
set	O
of	O
Blender-specific	O
features	O
such	O
as	O
the	O
node	O
material	O
editor	O
(	O
a	O
tool	O
for	O
visual	O
shader	O
programming	O
)	O
and	O
the	O
particle	O
system	O
.	O
</s>
<s>
There	O
is	O
basic	O
support	O
for	O
Blender	B-Application
's	O
non-linear	O
animation	O
(	O
NLA	O
)	O
editor	O
for	O
creating	O
simple	O
scenarios	O
.	O
</s>
<s>
Blend4Web	B-Application
is	O
based	O
on	O
Blender	B-Application
's	O
real-time	O
GLSL	B-Language
rendering	O
engine	O
,	O
which	O
users	O
are	O
recommended	O
to	O
use	O
in	O
order	O
to	O
enable	O
WYSIWYG	B-Application
editing	O
.	O
</s>
<s>
NASA	O
developed	O
an	O
interactive	B-General_Concept
web	B-Application
application	I-Application
called	O
Experience	B-Application
Curiosity	I-Application
to	O
celebrate	O
the	O
3rd	O
anniversary	O
of	O
the	O
Curiosity	O
rover	O
landing	O
on	O
Mars	B-Application
.	O
</s>
<s>
This	O
Blend4Web-based	O
app	O
makes	O
it	O
possible	O
to	O
operate	O
the	O
rover	O
,	O
control	O
its	O
cameras	O
and	O
the	O
robotic	O
arm	O
,	O
and	O
reproduce	O
some	O
of	O
the	O
prominent	O
events	O
of	O
the	O
Mars	B-Application
Science	O
Laboratory	O
mission	O
.	O
</s>
<s>
The	O
application	O
got	O
presented	O
at	O
the	O
beginning	O
of	O
the	O
WebGL	B-Library
section	O
at	O
SIGGRAPH	O
2015	O
.	O
</s>
<s>
Experience	B-Application
Curiosity	I-Application
was	O
ported	O
to	O
Verge3D	B-Language
for	O
Blender	B-Application
in	O
2018	O
with	O
several	O
performance	O
improvements	O
and	O
bug	O
fixes	O
.	O
</s>
<s>
Greenpeace	O
created	O
interactive	B-General_Concept
3D	O
infographics	O
to	O
back	O
Greenpeace	O
's	O
Detox	O
campaign	O
in	O
Russia	O
.	O
</s>
<s>
Tallink	O
featured	O
an	O
interactive	B-General_Concept
3D	O
presentation	O
of	O
its	O
MS	O
Megastar	O
vessel	O
to	O
allow	O
visitors	O
to	O
browse	O
details	O
of	O
the	O
ship	O
.	O
</s>
