Description :
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Incomplete dipyramid sweep, which is the repeated symmetrically.
Make a couple of coloured edges with vertices on the y-axis.
Sweep 3/4 of a turn
around the y-axis in 12 steps (to make a 16-gon dipyramid with a 1/4 missing).
In the second command remake the model and repeat it symmetrically to be
aligned with the edges of a cube.
View this model with the command
off_util null -Av0,1,0 -Av1,0,0 -Av0,-1,0 -Ae0,1:red -Ae1,2:green | sweep_edges -n 12 -R 0,3*ANG/4,0 | off_trans -T -1,0,-1 | poly_kscope -s T | antiview -t no_tri -x e
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