# Vertices
v -1.0 -1.0 0.0
v -1.0 1.0 0.0
v 1.0 -1.0 0.0
v 1.0 1.0 0.0

# Normals
vn 0 0 -1

# Polygonal faces
# Each number corresponds to the vertices' definition order.
#
#      2---------4
#     /         /
#    /         /
#   1---------3
#
#   z  y
#   | /
#   |/
#   +----x
#
f 1//1 2//1 4//1 3//1
