<s>
The	O
clip	O
coordinate	O
system	O
is	O
a	O
homogeneous	O
coordinate	O
system	O
in	O
the	O
graphics	B-General_Concept
pipeline	I-General_Concept
that	O
is	O
used	O
for	O
clipping	B-Algorithm
.	O
</s>
<s>
In	O
OpenGL	B-Application
,	O
clip	B-Algorithm
coordinates	I-Algorithm
are	O
positioned	O
in	O
the	O
pipeline	O
just	O
after	O
view	O
coordinates	O
and	O
just	O
before	O
normalized	O
device	O
coordinates	O
(	O
NDC	O
)	O
.	O
</s>
<s>
Objects	O
 '	O
coordinates	O
are	O
transformed	O
via	O
a	O
projection	B-Algorithm
transformation	I-Algorithm
into	O
clip	B-Algorithm
coordinates	I-Algorithm
,	O
at	O
which	O
point	O
it	O
may	O
be	O
efficiently	O
determined	O
on	O
an	O
object-by-object	O
basis	O
which	O
portions	O
of	O
the	O
objects	O
will	O
be	O
visible	O
to	O
the	O
user	O
.	O
</s>
<s>
In	O
the	O
context	O
of	O
OpenGL	B-Application
or	O
Vulkan	B-Application
,	O
the	O
result	O
of	O
executing	O
vertex	O
processing	O
shaders	O
is	O
considered	O
to	O
be	O
in	O
clip	B-Algorithm
coordinates	I-Algorithm
.	O
</s>
<s>
More	O
concretely	O
,	O
a	O
point	O
in	O
clip	B-Algorithm
coordinates	I-Algorithm
is	O
represented	O
with	O
four	O
components	O
,	O
</s>
<s>
and	O
the	O
following	O
equality	O
defines	O
the	O
relationship	O
between	O
the	O
normalized	O
device	O
coordinates	O
,	O
and	O
and	O
clip	B-Algorithm
coordinates	I-Algorithm
,	O
</s>
<s>
Clip	B-Algorithm
coordinates	I-Algorithm
are	O
convenient	O
for	O
clipping	B-Algorithm
algorithms	O
as	O
points	O
can	O
be	O
checked	O
if	O
their	O
coordinates	O
are	O
outside	O
of	O
the	O
viewing	O
volume	O
.	O
</s>
