<s>
glTF	B-Language
is	O
a	O
standard	O
file	O
format	O
for	O
three-dimensional	O
scenes	O
and	O
models	O
.	O
</s>
<s>
A	O
glTF	B-Language
file	O
uses	O
one	O
of	O
two	O
possible	O
file	O
extensions	O
:	O
.gltf	O
(	O
JSON/ASCII	O
)	O
or	O
.glb	O
(	O
binary	O
)	O
.	O
</s>
<s>
Both	O
.gltf	O
and	O
.glb	O
files	O
may	O
reference	O
external	O
binary	O
and	O
texture	O
resources	O
.	O
</s>
<s>
Alternatively	O
,	O
both	O
formats	O
may	O
be	O
self-contained	O
by	O
directly	O
embedding	O
binary	O
data	O
buffers	O
(	O
as	O
base64-encoded	O
strings	O
in	O
.gltf	O
files	O
or	O
as	O
raw	O
byte	O
arrays	O
in	O
.glb	O
files	O
)	O
.	O
</s>
<s>
An	O
open	O
standard	O
developed	O
and	O
maintained	O
by	O
the	B-Library
Khronos	I-Library
Group	I-Library
,	O
it	O
supports	O
3D	O
model	O
geometry	O
,	O
appearance	O
,	O
scene	B-Data_Structure
graph	I-Data_Structure
hierarchy	O
,	O
and	O
animation	O
.	O
</s>
<s>
At	O
SIGGRAPH	O
2012	O
,	O
Khronos	B-Library
presented	O
a	O
demo	O
of	O
glTF	B-Language
,	O
which	O
was	O
then	O
called	O
WebGL	B-Library
Transmissions	O
Format	O
(	O
WebGL	B-Library
TF	O
)	O
.	O
</s>
<s>
On	O
October	O
19	O
,	O
2015	O
,	O
the	O
glTF	B-Language
1.0	O
specification	O
was	O
released	O
.	O
</s>
<s>
At	O
SIGGRAPH	O
2016	O
,	O
Oculus	B-Application
announced	O
their	O
adoption	O
of	O
glTF	B-Language
citing	O
the	O
similarities	O
to	O
their	O
ovrscene	O
format	O
.	O
</s>
<s>
In	O
October	O
2016	O
,	O
Microsoft	O
joined	O
the	O
3D	O
Formats	O
working	O
group	O
at	O
Khronos	B-Library
to	O
collaborate	O
on	O
glTF	B-Language
.	O
</s>
<s>
The	O
second	O
version	O
,	O
glTF	B-Language
2.0	O
,	O
was	O
released	O
in	O
June	O
2017	O
,	O
and	O
is	O
a	O
complete	O
overhaul	O
of	O
the	O
file	O
format	O
from	O
version	O
1.0	O
,	O
with	O
most	O
tools	O
adopting	O
the	O
2.0	O
version	O
.	O
</s>
<s>
Based	O
on	O
a	O
proposal	O
by	O
Fraunhofer	O
originally	O
presented	O
at	O
SIGGRAPH	O
2016	O
,	O
Physically	O
based	O
rendering	O
(	O
PBR	O
)	O
was	O
added	O
,	O
replacing	O
WebGL	B-Library
shaders	B-Language
used	O
in	O
glTF	B-Language
1.0	O
.	O
</s>
<s>
Other	O
upgrades	O
include	O
sparse	O
accessors	O
and	O
morph	O
targets	O
for	O
techniques	O
such	O
as	O
facial	O
animation	O
,	O
and	O
schema	O
tweaks	O
and	O
breaking	O
changes	O
for	O
corner	O
cases	O
or	O
performance	O
such	O
as	O
replacing	O
top-level	O
glTF	B-Language
object	O
properties	O
with	O
arrays	O
for	O
faster	O
index-based	O
access	O
.	O
</s>
<s>
On	O
March	O
3	O
,	O
2017	O
,	O
Microsoft	O
announced	O
that	O
they	O
will	O
be	O
using	O
glTF	B-Language
2.0	O
as	O
the	O
3D	O
asset	O
format	O
across	O
their	O
product	O
line	O
,	O
including	O
Paint	B-Application
3D	I-Application
,	O
3D	B-Device
Viewer	I-Device
,	O
Remix	O
3D	O
,	O
Babylon.js	B-Language
,	O
and	O
Microsoft	B-Application
Office	I-Application
.	O
</s>
<s>
Sketchfab	B-Application
also	O
announced	O
support	O
for	O
glTF	B-Language
2.0	O
.	O
</s>
<s>
As	O
of	O
2019	O
,	O
the	O
glTF	B-Language
and	O
GLB	O
formats	O
are	O
used	O
on	O
and	O
supported	O
by	O
companies	O
including	O
DGG	O
,	O
UX3D	O
,	O
Sketchfab	B-Application
,	O
Facebook	B-Application
,	O
Microsoft	O
,	O
Oculus	B-Application
,	O
Google	B-Application
,	O
Adobe	O
,	O
Box	O
,	O
TurboSquid	O
,	O
Unreal	B-Operating_System
Engine	I-Operating_System
and	O
Qt	O
Quick	O
3D	O
.	O
</s>
<s>
The	O
format	O
has	O
been	O
noted	O
as	O
an	O
important	O
standard	O
for	O
augmented	B-General_Concept
reality	I-General_Concept
,	O
integrating	O
with	O
modeling	O
software	O
such	O
as	O
Autodesk	B-Language
Maya	I-Language
,	O
Autodesk	B-Language
3ds	I-Language
Max	I-Language
,	O
and	O
Poly	B-Application
.	O
</s>
<s>
In	O
February	O
2020	O
,	O
the	O
Smithsonian	O
Institution	O
launched	O
their	O
Open	O
Access	O
Initiative	O
,	O
releasing	O
approximately	O
2.8	O
million	O
2D	O
images	O
and	O
3D	O
models	O
into	O
the	O
public	O
domain	O
,	O
delivering	O
the	O
3D	O
models	O
in	O
glTF	B-Language
.	O
</s>
<s>
In	O
July	O
2022	O
,	O
glTF	B-Language
2.0	O
was	O
released	O
as	O
the	O
ISO/IEC	O
12113:2022	O
International	O
Standard	O
.	O
</s>
<s>
Khronos	B-Library
stated	O
they	O
will	O
make	O
regular	O
submissions	O
to	O
bring	O
updates	O
and	O
new	O
widely	O
adopted	O
glTF	B-Language
functionality	O
into	O
refreshed	O
versions	O
of	O
ISO/IEC	O
12113	O
to	O
ensure	O
that	O
there	O
is	O
no	O
long-term	O
divergence	O
between	O
the	O
ISO/IEC	O
and	O
Khronos	B-Library
specifications	O
.	O
</s>
<s>
A	O
glTF	B-Language
file	O
uses	O
either	O
a	O
.gltf	O
or	O
.glb	O
extension	O
.	O
</s>
<s>
As	O
new	O
PBR	O
extensions	O
are	O
released	O
,	O
they	O
continue	O
to	O
expand	O
PBR	O
capabilities	O
within	O
the	O
glTF	B-Language
framework	O
,	O
allowing	O
a	O
wider	O
range	O
of	O
scenes	O
and	O
objects	O
to	O
be	O
realistically	O
rendered	O
as	O
3D	O
assets	O
.	O
</s>
<s>
The	O
KTX	O
2.0	O
extension	O
for	O
universal	O
texture	O
compression	O
enables	O
3D	O
models	O
in	O
the	O
glTF	B-Language
format	O
to	O
be	O
highly	O
compressed	O
and	O
to	O
use	O
natively	O
supported	O
texture	O
formats	O
,	O
reducing	O
file	O
size	O
and	O
boosting	O
rendering	O
speed	O
.	O
</s>
<s>
Draco	O
is	O
a	O
glTF	B-Language
extension	O
for	O
mesh	O
compression	O
,	O
to	O
compress	O
and	O
decompress	O
3D	O
meshes	O
,	O
to	O
help	O
reduce	O
the	O
size	O
of	O
3D	O
files	O
.	O
</s>
<s>
The	O
GLB	O
file	O
format	O
is	O
a	O
binary	O
form	O
of	O
glTF	B-Language
that	O
includes	O
textures	O
instead	O
of	O
referencing	O
them	O
as	O
external	O
images	O
.	O
</s>
<s>
GLB	O
was	O
introduced	O
as	O
an	O
extension	O
to	O
glTF	B-Language
1.0	O
and	O
incorporated	O
directly	O
into	O
glTF	B-Language
2.0	O
.	O
</s>
<s>
On	O
August	O
10	O
,	O
2015	O
,	O
3D	O
Tiles	O
,	O
now	O
a	O
proposed	O
OGC	O
Community	O
Standard	O
,	O
built	O
on	O
glTF	B-Language
to	O
add	O
a	O
spatial	O
data	O
structure	O
,	O
metadata	O
,	O
and	O
declarative	O
styling	O
for	O
streaming	O
massive	O
heterogeneous	O
3D	O
geospatial	O
datasets	O
.	O
</s>
<s>
The	O
glTF	B-Language
Sample	O
Viewer	O
is	O
maintained	O
by	O
Khronos	B-Library
,	O
as	O
part	O
of	O
the	O
glTF	B-Language
ecosystem	O
,	O
along	O
with	O
the	O
Validator	O
,	O
which	O
validates	O
glTF	B-Language
assets	O
.	O
</s>
<s>
glTF	B-Language
loaders	O
are	O
in	O
open-source	B-Application
including	O
PlayCanvas	B-Operating_System
,	O
Three.js	B-Language
,	O
Babylon.js	B-Language
,	O
,	O
,	O
,	O
and	O
.	O
</s>
<s>
The	O
Godot	B-Application
game	I-Application
engine	I-Application
also	O
supports	O
and	O
recommends	O
the	O
glTF	B-Language
format	O
.	O
</s>
<s>
Open-source	B-Application
are	O
available	O
from	O
COLLADA	O
,	O
FBX	B-Application
,	O
and	O
OBJ	O
.	O
</s>
<s>
Assimp	B-Language
can	O
import	O
and	O
export	O
glTF	B-Language
.	O
</s>
<s>
glTF	B-Language
files	O
can	O
also	O
be	O
directly	O
exported	O
from	O
a	O
variety	O
of	O
3D	O
editors	O
,	O
such	O
as	O
Blender	B-Application
,	O
Vectary	O
,	O
Autodesk	B-Language
3ds	I-Language
Max	I-Language
(	O
natively	O
or	O
using	O
Verge3D	B-Language
exporter	O
)	O
,	O
Autodesk	B-Language
Maya	I-Language
(	O
using	O
babylon.js	B-Language
exporter	O
)	O
,	O
Autodesk	B-Device
Inventor	I-Device
,	O
Modo	B-Application
,	O
Houdini	B-Application
,	O
Paint	B-Application
3D	I-Application
,	O
and	O
Substance	O
Painter	O
.	O
</s>
<s>
Open-source	B-Application
are	O
available	O
for	O
programming	O
languages	O
including	O
JavaScript	B-Language
,	O
Node.js	B-Language
,	O
C++	B-Language
,	O
C#	B-Application
,	O
Java	B-Language
,	O
Go	B-Application
,	O
Rust	B-Application
,	O
Haxe	B-Language
,	O
Ada	B-Language
,	O
and	O
TypeScript	B-Language
.	O
</s>
<s>
An	O
open-source	B-Application
glTF	B-Language
validator	O
can	O
validate	O
if	O
3D	O
models	O
conform	O
to	O
the	O
glTF	B-Language
specification	O
.	O
</s>
<s>
3D	O
Commerce	O
,	O
a	O
working	O
group	O
of	O
universal	O
guidelines	O
,	O
standards	O
and	O
certifications	O
for	O
3D	O
content	O
creation	O
and	O
distribution	O
in	O
e-commerce	O
,	O
incorporates	O
glTF	B-Language
for	O
transmission	O
of	O
photorealistic	O
3D	O
assets	O
.	O
</s>
<s>
In	O
June	O
2021	O
,	O
the	O
3D	O
Commerce	O
viewer	O
certification	O
program	O
was	O
launched	O
,	O
enabling	O
3D	O
viewers	O
to	O
demonstrate	O
they	O
can	O
accurately	O
and	O
reliably	O
display	O
3D	O
products	O
using	O
the	O
glTF	B-Language
file	O
format	O
.	O
</s>
<s>
3D	O
Commerce	O
's	O
asset	O
guidelines	O
,	O
released	O
in	O
2020	O
,	O
include	O
best	O
practices	O
for	O
use	O
of	O
the	O
glTF	B-Language
file	O
format	O
in	O
3D	O
Commerce	O
.	O
</s>
