Programmers may define a line set as an array of polylines to accelerate hit-testing, pathfinding

https://sierra-wiki.win/index.php/Top_Signs_Your_Mini_Split_Line_Set_Needs_Replacement

Programmers may define a line set as an array of polylines to accelerate hit-testing, pathfinding, and collision detection, using spatial indices to swiftly query segments in large interactive scenes.