polyline p 0 0 0 0 0 10 2 0 10 2 0 2 3 0 6 5 0 6 5 0 0 0 0 0
mkplane f p
prism s f 0 5 0

offsetparameter 1e-7 c i r
offsetload s 1
explode s f
offsetonface s_4 4.5
offsetperform result

checkprops result -s 410 -v 504

unifysamedom result_unif result
checknbshapes result_unif -vertex 12 -edge 18 -wire 8 -face 8 -shell 1 -solid 1

checkview -display result_unif -2d -path ${imagedir}/${test_image}.png
