gmvinput ascii
nodes 1
 0 0 50
cells 0
material 2 1
mat1
mat2
1
polygons
2 4 -75 -75 -75 -75
    -50 -50 150 150
    150 -75 -75
endpoly
comments
  trailing 150 is missing in polygons definition
endcomm
endgmv
