Save this to an .obj file and load it - you'll see that it misses the top and bottom faces.
Code: Select all
# FreeCAD v0.16 build6179 (Git) Arch module
# http://www.freecadweb.org
o Pad
v -40.0 50.0 0.0
v -40.0 50.0 10.0
v -60.0 40.0 0.0
v -60.0 40.0 10.0
v -50.0 30.0 0.0
v -50.0 30.0 10.0
v -60.0 20.0 0.0
v -60.0 20.0 10.0
v -40.0 10.0 0.0
v -40.0 10.0 10.0
v -20.0 30.0 0.0
v -20.0 30.0 10.0
f 4 3 1 2
f 6 5 3 4
f 8 7 5 6
f 10 9 7 8
f 12 11 9 10
f 2 1 11 12
f 11 9 7 5 3 1
f 2 4 6 8 10 12
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f 11 9 7 5
f 6 8 10 12
Don't know if that helps with anything?