<s>
OpenVR	B-General_Concept
is	O
a	O
software	B-Application
development	I-Application
kit	I-Application
(	O
SDK	O
)	O
and	O
application	B-Application
programming	I-Application
interface	I-Application
(	O
API	B-Application
)	O
developed	O
by	O
Valve	O
for	O
supporting	O
the	O
SteamVR	B-Application
and	O
other	O
virtual	B-Device
reality	I-Device
headset	I-Device
devices	O
.	O
</s>
<s>
The	O
SteamVR	B-Application
platform	O
uses	O
it	O
as	O
the	O
default	O
application	B-Application
programming	I-Application
interface	I-Application
and	O
runtime	O
.	O
</s>
<s>
It	O
serves	O
as	O
the	O
interface	O
between	O
the	O
virtual	O
reality	O
hardware	O
and	O
software	O
and	O
is	O
implemented	O
by	O
SteamVR	B-Application
.	O
</s>
<s>
Although	O
OpenVR	B-General_Concept
is	O
the	O
default	O
SDK	O
for	O
HTC	O
Vive	O
,	O
it	O
was	O
developed	O
to	O
have	O
multiple	O
vendor	O
support	O
.	O
</s>
<s>
For	O
instance	O
,	O
a	O
developer	O
can	O
design	O
OpenVR-based	O
trigger	O
button	O
functions	O
for	O
controllers	O
of	O
Oculus	O
Rift	O
or	O
Windows	O
MR	O
because	O
these	O
systems	O
are	O
both	O
supported	O
by	O
the	O
SDK	O
.	O
</s>
<s>
Valve	O
has	O
announced	O
that	O
they	O
will	O
be	O
cooperating	O
with	O
the	O
Open	B-Device
Source	I-Device
Virtual	I-Device
Reality	I-Device
project	O
,	O
although	O
the	O
extent	O
of	O
the	O
cooperation	O
is	O
unclear	O
.	O
</s>
<s>
OpenVR	B-General_Concept
SDK	O
was	O
released	O
to	O
the	O
public	O
on	O
30	O
April	O
2015	O
by	O
valve	O
developer	O
,	O
for	O
the	O
developer	O
to	O
develop	O
SteamVR	B-Application
games	O
and	O
software	O
.	O
</s>
<s>
It	O
provides	O
support	O
for	O
the	O
HTC	O
Vive	O
Developer	O
Edition	O
,	O
including	O
the	O
SteamVR	B-Application
controller	O
and	O
Lighthouse	O
.	O
</s>
<s>
The	O
OpenVR	B-General_Concept
SDK	O
has	O
replaced	O
the	O
API	B-Application
that	O
was	O
previously	O
available	O
in	O
steamvr.h	O
in	O
the	O
Steamworks	O
SDK	O
.	O
</s>
<s>
The	O
old	O
API	B-Application
will	O
continue	O
to	O
receive	O
support	O
indefinitely	O
,	O
but	O
applications	O
that	O
require	O
any	O
of	O
the	O
new	O
features	O
must	O
switch	O
to	O
the	O
new	O
SDK	O
.	O
</s>
<s>
Details	O
can	O
be	O
found	O
in	O
the	O
OpenVR	B-General_Concept
API	B-Application
documentation	I-Application
.	O
</s>
<s>
With	O
the	O
new	O
OpenVR	B-General_Concept
SDK	O
,	O
software	O
can	O
now	O
be	O
connected	O
to	O
SteamVR	B-Application
hardware	O
.	O
</s>
<s>
The	O
SDK	O
can	O
be	O
downloaded	O
from	O
OpenVR	B-General_Concept
github	O
page	O
.	O
</s>
<s>
It	O
supports	O
all	O
SteamVR	B-Application
products	O
.	O
</s>
<s>
The	O
SteamVR	B-Application
Unity	O
Plugin	O
and	O
native	O
SteamVR	B-Application
support	O
in	O
Unreal	O
4.8	O
have	O
been	O
implemented	O
to	O
support	O
Unity	O
in	O
addition	O
to	O
the	O
OpenVR	B-General_Concept
SDK	O
support	O
.	O
</s>
<s>
Both	O
are	O
available	O
shortly	O
after	O
the	O
OpenVR	B-General_Concept
initial	O
release	O
.	O
</s>
<s>
CAPI	O
and	O
C#	B-Application
bindings	O
for	O
OpenVR	B-General_Concept
interfaces	O
added	O
to	O
headers	O
.	O
</s>
<s>
Added	O
IVRSystem::PollNextEvent	O
to	O
the	O
API	B-Application
.	O
</s>
