Graphics Reference
In-Depth Information
Y
4
3
2
1
1
2
3
4
5
X
Fig. 12.2.
A five-sided irregular polygon.
72
108
108
Fig. 12.3.
A dodecahedron with one of its pentagonal sides.
Y
P
′
v
2
g
v
1
P
Z
X
Fig. 12.4.
The dihedral angle
γ
between two pentagonal sides.
Figure 12.4 illustrates the geometry required to fold two pentagonal sides
through the dihedral angle
γ
.
The point
P
has coordinates
P
(
x, y, z
) = (sin(72
◦
)
,
0
,
cos(72
◦
))
−
