Phew. This had me really stumped but I managed to solve the issue by using the slightly altered function in this thread . The problem seemed to be in the fact that one of the crossing lines was perfectly horizontal. For some scientific reason this introduces possibility for error due to floating poi...

I'm doing something that requires checking line intersections. Being a lazy sob, I'm using this code from the General math wiki page : -- Checks if two lines intersect (or line segments if seg is true) -- Lines are given as four numbers (two coordinates) function findIntersect(l1p1x,l1p1y, l1p2x,l1p...