Manhattan Heuristic modification y-preference

#1

How do I modify the Manhattan heuristic to prefer the closer y axis on matches with ~h within a low range (or closer y or two best h’s)? I need the path search to try and climb/descend to matching y if possible, before searching above/below y branches for alternate route. Elevator/stairs in 100+ floor building scenario, 99% of the time getting to same y first will be necessary and save a lot of processing with that shortcut.

A lot of wasted space in searches comes from a triangular area that gets filled in between the shaft and point on above floor while manhattan tries to get to that point climbing.

Thanks

#2

Hi

If your world is static (or has very rare graph updates) I would recommend that you try the heuristic optimization described here: https://arongranberg.com/astar/docs/heuristicopt.html

Otherwise you can adjust the heuristic in the Path.cs script in the CalculateHScore method.