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

https://fast-wiki.win/index.php/HVAC_Line_Set_Routing_for_Tight_Spaces_and_Difficult_Layouts

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.