When finding intersection of segments (a, b) and (c, d) I am finding t1, t2, such that a + (b - a) * t1 = c + (d - a) * t2, -eps <= t1 <= 1+eps, -eps <= t2 <= 1+eps.
This code doesn't work for eps=1e-12, but works for eps=0.

THIS IS MINDBLOWING