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

https://wiki-fusion.win/index.php/HVAC_Line_Set_Replacement_Warning_Signs_You_Shouldn%E2%80%99t_Ignore

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.