Hi Jo,

Neat and looks very complicated. I look forward to the animated 
walk-through ;)

I have not checked your source but wonder if you calculate all 4 walls
of a room at the same time?  Around 30 years ago I was playing with 3D
mazes and realised you only need a left and back wall to a cell, the
right and front walls will be defined in adjacent cells. The floor
will also be the ceiling of the cell below. Saved a lot of valuable
mem and time in those days ;)

Alf

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