1 cellSet heater new boxToCell (-0.01 0 -100 )(0.01 0.01 100)
2 cellSet heater add boxToCell (-0.01 -100 -0.01)(0.01 0.01 0.01)
3 cellSet leftSolid new boxToCell (-100 0 -100 )(-0.01 0.01 100)
4 cellSet rightSolid new boxToCell (0.01 0 -100 )(100 0.01 100)
5 cellSet topAir new boxToCell (-100 0.01 -100 )(100 100 100)
6 cellSet bottomAir clear
7 cellSet bottomAir add cellToCell heater
8 cellSet bottomAir add cellToCell leftSolid
9 cellSet bottomAir add cellToCell rightSolid
10 cellSet bottomAir add cellToCell topAir
11 cellSet bottomAir invert