Hi,
I’m working on a script that iteratively checks for line-line-intersections of a set of line segments that lie within the same plane.
I’ve noticed that sometimes, two nearly parallel line segments have an intersection at a parameter very close to 0.5, which roughly translates to a mid point.
For the top line segment the intersection parameter is found at 0.5039106145251397 and for the bottom one at 0.49497206703910607.
I’m using Rhino.Geometry.Intersect.Intersection.LineLine() to compute the intersections.
I would like to understand what causes this?
I’ve currently fixed the bug that thus emerged, by computing the “two-dimensional” vector cross product of the line segment directions and checking its z-value as a scalar.
If this scalar is between the negative and positive absolute model tolerance (i.e. 0.001), I simply skip the intersection computation for near parallel lines.
This fixes the issue, but I would still want to know how this happens!
Thanks for taking a look.
parallel_intersection.gh (3.4 KB)
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