boolean sameSame (Strip s1, Strip s2) { return max(dist2(s1, 0, s2, 0), dist2(s1,15, s2,15)) < 5 ; } // same strut, same direction
boolean sameOpp (Strip s1, Strip s2) { return max(dist2(s1, 0, s2,15), dist2(s1,15, s2,0 )) < 5 ; } // same strut, opp direction
boolean sameBar (Strip s1, Strip s2) { return sameSame(s1,s2) || sameOpp(s1,s2); } // 2 strips on same strut
boolean sameSame (Strip s1, Strip s2) { return max(dist2(s1, 0, s2, 0), dist2(s1,15, s2,15)) < 5 ; } // same strut, same direction
boolean sameOpp (Strip s1, Strip s2) { return max(dist2(s1, 0, s2,15), dist2(s1,15, s2,0 )) < 5 ; } // same strut, opp direction
boolean sameBar (Strip s1, Strip s2) { return sameSame(s1,s2) || sameOpp(s1,s2); } // 2 strips on same strut