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

https://astro-wiki.win/index.php/Line_Set_Support_and_Fastening_Tips_for_Secure_Installation

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.