The default weave for a cube. In this weave each circuit is crossed in
two directions. For weaves that produce duplicate circuits these circuits
can be merged with e.g. off_util -M a.
View this model with the command
poly_weave cube | off_util -M a | off_color -f U -e F -v F | antiview -x f -v 0.05 -e 0.05
