5-2 Special mapping equations 191
N
r
T N S
2
R
P
p = π(P )
O
R
Fig. 5.22. The orthographic projection of the sphere: S
2
R → T N S
2
R .
A sample of the polar orthographic projection (parallel projection, orthogonal projection) of the sphere
is finally presented to you in Fig. 5.24.
N
r
P
2
O
P
p = π(P )
O
R
Fig. 5.23. The orthographic projection of the sphere: S
2
R → P
2
O .
N
r
T N S
2
R
P
p = π(P )
O
R
Fig. 5.22. The orthographic projection of the sphere: S
2
R → T N S
2
R .
A sample of the polar orthographic projection (parallel projection, orthogonal projection) of the sphere
is finally presented to you in Fig. 5.24.
N
r
P
2
O
P
p = π(P )
O
R
Fig. 5.23. The orthographic projection of the sphere: S
2
R → P
2
O .