<s>
Freescape	B-Application
is	O
a	O
video	O
game	O
engine	O
,	O
an	O
early	O
3D	O
game	O
engine	O
used	O
in	O
video	O
games	O
such	O
as	O
1987	O
's	O
Driller	B-Application
.	O
</s>
<s>
Graphics	O
were	O
composed	O
mostly	O
of	O
solid	O
geometry	O
rendered	O
without	O
shading	B-General_Concept
.	O
</s>
<s>
Developed	O
in-house	O
by	O
Incentive	O
Software	O
,	O
Freescape	B-Application
is	O
considered	O
to	O
be	O
one	O
of	O
the	O
first	O
proprietary	B-Application
3D	O
engines	O
to	O
be	O
used	O
in	O
video	O
games	O
,	O
although	O
the	O
engine	O
was	O
not	O
used	O
commercially	O
outside	O
of	O
Incentive	O
's	O
own	O
titles	O
.	O
</s>
<s>
Paul	O
Gregory	O
(	O
graphics	O
artist	O
for	O
Major	O
Developments	O
,	O
Incentive	O
's	O
in-house	O
design	O
team	O
)	O
mentions	O
that	O
Freescape	B-Application
was	O
developed	O
by	O
Chris	O
Andrew	O
starting	O
in	O
September	O
1986	O
on	O
an	O
Amstrad	B-Device
CPC	I-Device
,	O
as	O
it	O
was	O
the	O
most	O
suitable	O
development	O
system	O
with	O
128K	O
memory	O
and	O
had	O
adequate	O
power	O
to	O
run	O
3D	O
environments	O
.	O
</s>
<s>
Due	O
to	O
the	O
engine	O
's	O
success	O
,	O
it	O
was	O
later	O
ported	O
to	O
all	O
the	O
dominant	O
systems	O
of	O
the	O
era	O
:	O
the	O
ZX	B-Operating_System
Spectrum	I-Operating_System
,	O
the	O
IBM	B-Device
PC	I-Device
,	O
the	O
Commodore	O
64	O
,	O
Amiga	B-Device
and	O
Atari	B-Device
ST	I-Device
.	O
</s>
<s>
Freescape	B-Application
development	O
ended	O
in	O
1992	O
with	O
the	O
release	O
of	O
3D	B-Application
Construction	I-Application
Kit	I-Application
II	I-Application
.	O
</s>
<s>
Its	O
legacy	O
continued	O
in	O
the	O
latter	O
Superscape	O
VRT	O
virtual	O
reality	O
authoring	O
engine	O
,	O
from	O
the	O
same	O
developer	O
and	O
advertised	O
on	O
the	O
3D	B-Application
Construction	I-Application
Kit	I-Application
II	I-Application
software	O
.	O
</s>
<s>
The	O
Freescape	B-Application
engine	I-Application
allowed	O
the	O
generation	O
of	O
complete	O
3D	O
environments	O
that	O
consist	O
of	O
a	O
floor	O
and	O
as	O
many	O
primitives	B-Algorithm
as	O
memory	O
and	O
processor	O
speed	O
realistically	O
allowed	O
for	O
.	O
</s>
<s>
These	O
primitives	B-Algorithm
were	O
cuboids	B-General_Concept
,	O
four-sided	O
frustums	O
(	O
called	O
pyramids	B-Algorithm
by	O
Freescape	B-Application
)	O
,	O
triangles	O
,	O
rectangles	O
,	O
quadrilaterals	O
,	O
pentagons	B-Device
,	O
hexagons	B-Application
and	O
line	O
segments	O
.	O
</s>
<s>
A	O
further	O
primitive	B-Algorithm
,	O
"	O
sensor	O
"	O
,	O
was	O
used	O
for	O
gaming	O
purpose	O
to	O
detect	O
the	O
position	O
of	O
the	O
camera	O
relative	O
to	O
the	O
sensor	O
in	O
the	O
game	O
world	O
.	O
</s>
<s>
Freescape	B-Application
was	O
designed	O
with	O
limited	O
hardware	O
in	O
mind	O
and	O
as	O
such	O
contains	O
a	O
number	O
of	O
inherent	O
limitations	O
that	O
are	O
necessary	O
to	O
enable	O
the	O
games	O
to	O
run	O
properly	O
on	O
these	O
computers	O
:	O
</s>
<s>
Games	O
used	O
the	O
Freescape	B-Application
Command	O
Language	O
( 	O
 '	O
FCL	O
 '	O
)	O
,	O
an	O
early	O
in-game	O
scripting	B-Language
language	I-Language
,	O
to	O
add	O
interactive	O
elements	O
to	O
Freescape	B-Application
worlds	O
.	O
</s>
<s>
Versions	O
of	O
Freescape	B-Application
for	O
the	O
Amiga	B-Device
,	O
Atari	B-Device
ST	I-Device
and	O
PC	O
also	O
supported	O
'	O
animators	O
 '	O
,	O
which	O
were	O
FCL	O
programs	O
that	O
use	O
a	O
few	O
extra	O
instructions	O
to	O
create	O
on-screen	O
animations	O
.	O
</s>
