<s>
Qfusion	B-Language
is	O
a	O
3D	O
game	O
engine	O
.	O
</s>
<s>
It	O
is	O
written	O
in	O
C	B-Language
for	O
use	O
on	O
Windows	B-Application
and	O
Unix-based	O
systems	O
.	O
</s>
<s>
The	O
engine	O
also	O
supports	O
the	O
data	O
of	O
Quake	B-Application
III	I-Application
as	O
maps	O
,	O
3D	O
models	O
and	O
shaders	O
.	O
</s>
<s>
Qfusion	B-Language
is	O
a	O
fork	O
of	O
id	B-Application
Tech	I-Application
2	I-Application
,	O
popularly	O
known	O
as	O
the	O
Quake	B-Application
II	I-Application
engine	I-Application
.	O
</s>
<s>
Qfusion	B-Language
is	O
free	B-License
and	I-License
open-source	I-License
software	I-License
subject	O
to	O
the	O
terms	O
of	O
the	O
GNU	B-License
GPL-2.0-or-later	I-License
.	O
</s>
<s>
The	O
engine	O
supports	O
Ogg	B-Algorithm
Vorbis	I-Algorithm
sound	O
and	O
KTX	O
(	O
ETC1	O
)	O
,	O
TGA	O
,	O
JPEG	O
,	O
PNG	O
for	O
images	O
.	O
</s>
<s>
More	O
recent	O
versions	O
of	O
Qfusion	B-Language
engine	O
also	O
extend	O
the	O
Q3	O
rendering	O
scheme	O
to	O
include	O
Normal	O
Mapping	O
,	O
GLSL	B-Language
shaders	O
(	O
including	O
bump	O
mapping	O
and	O
cel	O
shading	O
)	O
,	O
and	O
skeletal	O
animation	O
.	O
</s>
