What is the difference between scan and update on AStarPath?

Beginner Questions
#1

Just wondering what scan does and what update does and how they differ?

#2

Hi

Scan recalculates the whole graph, a slow process. UpdateGraphs can update only a small region of it and is therefore much faster and better suited for updating the graph when the game is running.

#3

See http://arongranberg.com/astar/docs/graph-updates.php

#4

Thanks.