<s>
Axonometry	B-Application
is	O
a	O
graphical	O
procedure	O
belonging	O
to	O
descriptive	B-Language
geometry	I-Language
that	O
generates	O
a	O
planar	O
image	O
of	O
a	O
three-dimensional	O
object	O
.	O
</s>
<s>
The	O
term	O
"	O
axonometry	B-Application
"	O
means	O
"	O
to	O
measure	O
along	O
axes	O
"	O
,	O
and	O
indicates	O
that	O
the	O
dimensions	O
and	O
scaling	B-Algorithm
of	O
the	O
coordinate	O
axes	O
play	O
a	O
crucial	O
role	O
.	O
</s>
<s>
In	O
general	O
,	O
the	O
resulting	O
parallel	O
projection	O
is	O
oblique	O
(	O
the	O
rays	O
are	O
not	O
perpendicular	O
to	O
the	O
image	O
plane	O
)	O
;	O
but	O
in	O
special	O
cases	O
the	O
result	O
is	O
orthographic	O
(	O
the	O
rays	O
are	O
perpendicular	O
to	O
the	O
image	O
plane	O
)	O
,	O
which	O
in	O
this	O
context	O
is	O
called	O
an	O
orthogonal	B-Application
axonometry	B-Application
.	O
</s>
<s>
In	O
technical	B-Application
drawing	I-Application
and	O
in	O
architecture	O
,	O
axonometric	O
perspective	O
is	O
a	O
form	O
of	O
two-dimensional	O
representation	O
of	O
three-dimensional	O
objects	O
whose	O
goal	O
is	O
to	O
preserve	O
the	O
impression	O
of	O
volume	O
or	O
relief	O
.	O
</s>
<s>
The	O
term	O
axonometry	B-Application
is	O
used	O
both	O
for	O
the	O
graphical	O
procedure	O
described	O
below	O
,	O
as	O
well	O
as	O
the	O
image	O
produced	O
by	O
this	O
procedure	O
.	O
</s>
<s>
Axonometry	B-Application
should	O
not	O
be	O
confused	O
with	O
axonometric	O
projection	O
,	O
which	O
in	O
English	O
literature	O
usually	O
refers	O
to	O
orthogonal	B-Application
axonometry	B-Application
.	O
</s>
<s>
of	O
the	O
house	O
drawn	O
on	O
graph	O
paper	O
)	O
are	O
:	O
Hence	O
it	O
is	O
a	O
dimetric	O
axonometry	B-Application
.	O
</s>
<s>
a	O
uniformly	O
scaled	O
orthographic	O
projection	O
with	O
scaling	B-Algorithm
factor	O
1.06	O
,	O
</s>
<s>
Such	O
axonometries	B-Application
are	O
often	O
used	O
for	O
city	O
maps	O
,	O
in	O
order	O
to	O
keep	O
horizontal	O
figures	O
undistorted	O
.	O
</s>
<s>
For	O
an	O
isometric	O
axonometry	B-Application
all	O
foreshortenings	O
are	O
equal	O
.	O
</s>
<s>
Some	O
computer	O
graphic	O
systems	O
(	O
for	O
example	O
,	O
xfig	B-Application
)	O
provide	O
a	O
suitable	O
raster	O
(	O
see	O
diagram	O
)	O
as	O
support	O
.	O
</s>
<s>
If	O
the	O
image	O
of	O
a	O
circle	O
is	O
an	O
ellipse	O
,	O
one	O
can	O
map	O
four	O
points	O
on	O
orthogonal	B-Application
diameters	O
and	O
the	O
surrounding	O
square	O
of	O
tangents	O
and	O
in	O
the	O
image	O
parallelogram	O
fill-in	O
an	O
ellipse	O
by	O
hand	O
.	O
</s>
<s>
A	O
better	O
,	O
but	O
more	O
time	O
consuming	O
method	O
consists	O
of	O
drawing	O
the	O
images	O
of	O
two	O
perpendicular	O
diameters	O
of	O
the	O
circle	O
,	O
which	O
are	O
conjugate	O
diameters	O
of	O
the	O
image	O
ellipse	O
,	O
determining	O
the	O
axes	O
of	O
the	O
ellipse	O
with	O
Rytz	B-Application
's	I-Application
construction	I-Application
and	O
drawing	O
the	O
ellipse	O
.	O
</s>
<s>
In	O
a	O
general	O
axonometry	B-Application
of	O
a	O
sphere	O
the	O
image	O
contour	O
is	O
an	O
ellipse	O
.	O
</s>
<s>
The	O
contour	O
of	O
a	O
sphere	O
is	O
a	O
circle	O
only	O
in	O
an	O
orthogonal	B-Application
axonometry	B-Application
.	O
</s>
<s>
As	O
the	O
diagram	O
shows	O
,	O
an	O
ellipse	O
as	O
the	O
contour	O
of	O
a	O
sphere	O
might	O
be	O
confusing	O
,	O
so	O
,	O
if	O
a	O
sphere	O
is	O
part	O
of	O
an	O
object	O
to	O
be	O
mapped	O
,	O
one	O
should	O
choose	O
an	O
orthogonal	B-Application
axonometry	B-Application
or	O
an	O
engineer	O
projection	O
or	O
a	O
standard	O
isometry	O
.	O
</s>
