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my $cube = [ [-0.5, 0.5, 0.5],[ 0.5, 0.5, 0.5],[ 0.5,-0.5, 0.5],[-0.5,-0.5, 0.5 +], # front face [-0.5, 0.5,-0.5],[ 0.5, 0.5,-0.5],[ 0.5,-0.5,-0.5],[-0.5,-0.5,-0.5 +], # back face ];
[ [-0.50000000000000011, 0.49999999999999989, 0.49999999999999971], ... [ 0.49999999999999921,-0.500000000000000001,-0.500000000000000022] +, [-0.50000000000000011,-0.4999999999999999002,-0.50000000000000001] +, # back face ];