o two-component position
v 0.5 1.0

o five-component position with optional fourth component
v 0.5 1 2 0.0 3.5

o four-component normal
v 0.5 1 2
vn 0.5 1.0 2.3 7.4

o four-component index tuple
v 1 2 3
p 4/1/1/1

o point with two indices
v 1 2 3
p 5 5

o line with one index
v 1 2 3
l 6

o triangle with two indices
v 1 2 3
f 7 7

o quad
v 1 2 3
f 8 8 8 8