6 :alpha sin :alpha cos 0 vector3 !p
8 :p :p (0,0,1) cross :alpha 0.5 mul rot_vec
11 (0,0,1) :p (0,0,1) cross :alpha 0.5 mul rot_vec
18 ] 4 poly2doubleface dup !e0
20 10.0 10.0 360.0 { !alpha
22 :alpha sin :alpha cos 0 vector3 !p
24 :p :p (0,0,1) cross :alpha 0.5 mul rot_vec
27 (0,0,1) :p (0,0,1) cross :alpha 0.5 mul rot_vec
34 ] 4 poly2doubleface !e
35 :e edgemate faceCCW 1 bridgerings-simple pop
39 :e0 edgemate faceCW 1 bridgerings-simple pop