IRC logs for #openttd on OFTC at 2022-07-29
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16:32:47 <Samu> assert(max(dx, dy) - min(dx, dy) == abs(dx - dy))
16:32:59 <Samu> i didn't know this was always true
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16:35:11 <Samu> it could be simpler without using them
16:37:37 <Samu> i tested that implementation on my pf, and I don't really see the purpose
16:45:16 <Samu> old_cost is the old implementation of the cost
16:45:29 <Samu> cost is the implementation that is equal to that of YAPF
16:45:53 <Samu> there's sometimes a difference between them
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18:39:16 <Rubidium> Samu: I think the idea is that if the exit is facing away from the destination, the estimate should be higher than when the exit faces towards the destination. After all, in the first case you need at least two extra tiles to "turn around" with 90 degree corners. By increasing the estimate for those cases, those cases are less likely to be considered potentially improving the overall performance
18:55:30 <DorpsGek> - Update: Translations from eints (by translators)
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19:19:31 <Samu> aha, I see, so it seems i have this badly implemented
19:26:05 <Samu> my exitdir is actually the entrydir, no wonder I wasn't understanding it
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19:28:53 <Samu> i guess i can't implement yapf's estimate cost method into this pf
19:29:51 <Samu> the tile that it's checking is the tile that's next after following the direction from the previous tile
19:30:57 <Samu> and yapf method checks the tile where the direction is the one that is followed on that tile
19:32:08 <Samu> my pf doesn't know of any directions on the tile it's estimating, it doesn't know it yet, it will only be known after checking neighbours
19:38:09 <Samu> i would only have that tile with "exitdirs" 0, 1 and 2, never 3. They are the directions the tile is accessed from :(
19:45:14 <Samu> well it was a nice experiment anyway
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