here
p 0 0 0
p -1 1 0
p -1 1 0.5
p 0 0 0.5

p -1 1 1.5
p 0 0 1.5

p -2.5 1 0
p -2.5 1 1.5

mtl metal_yellow
f 0 1 2 3
f 1 4 7 6
mtl klaashele
f 2 3 5 4