<s>
In	O
3D	O
computer	O
graphics	O
,	O
a	O
micropolygon	B-General_Concept
(	O
or	O
μ-polygon	O
)	O
is	O
a	O
polygon	B-General_Concept
that	O
is	O
very	O
small	O
relative	O
to	O
the	O
image	O
being	O
rendered	O
.	O
</s>
<s>
Commonly	O
,	O
the	O
size	O
of	O
a	O
micropolygon	B-General_Concept
is	O
close	O
to	O
or	O
even	O
less	O
than	O
the	O
area	O
of	O
a	O
pixel	B-Algorithm
.	O
</s>
<s>
Micropolygons	B-General_Concept
allow	O
a	O
renderer	O
to	O
create	O
a	O
highly	O
detailed	O
image	O
.	O
</s>
<s>
The	O
concept	O
of	O
micropolygons	B-General_Concept
was	O
developed	O
within	O
the	O
Reyes	O
algorithm	O
,	O
in	O
which	O
geometric	B-Algorithm
primitives	I-Algorithm
are	O
tessellated	B-Algorithm
at	O
render	O
time	O
into	O
a	O
rectangular	O
grid	O
of	O
tiny	O
,	O
four-sided	O
polygons	B-General_Concept
.	O
</s>
<s>
A	O
shader	O
might	O
fill	O
each	O
micropolygon	B-General_Concept
with	O
a	O
single	O
color	O
or	O
assign	O
colors	O
on	O
a	O
per-vertex	O
basis	O
.	O
</s>
<s>
Shaders	O
that	O
operate	O
on	O
micropolygons	B-General_Concept
can	O
process	O
an	O
entire	O
grid	O
of	O
them	O
at	O
once	O
in	O
SIMD	B-Device
fashion	O
.	O
</s>
<s>
This	O
often	O
leads	O
to	O
faster	O
shader	O
execution	O
,	O
and	O
allows	O
shaders	O
to	O
compute	O
spatial	O
derivatives	B-Algorithm
(	O
e.g.	O
</s>
<s>
for	O
texture	O
filtering	O
)	O
by	O
comparing	O
values	O
at	O
neighboring	O
micropolygon	B-General_Concept
vertices	O
.	O
</s>
<s>
Furthermore	O
,	O
a	O
renderer	O
using	O
micropolygons	B-General_Concept
can	O
support	O
displacement	O
mapping	O
simply	O
by	O
perturbing	O
micropolygon	B-General_Concept
vertices	O
during	O
shading	O
.	O
</s>
