[Oxyd] Blue biters vanish suddenly

Nic · Post by **Nic** » Sat Oct 03, 2015 3:13 pm

https://www.youtube.com/watch?v=53P8oPSXtjQ

Post by **Rseding91** » Sat Oct 03, 2015 4:16 pm

That's by design. Previously they would die: https://forums.factorio.com/forum/vie ... die#p16823

It's a mechanic to prevent biters from building up over time and never getting anywhere slowing down the game.

Post by **Oxyd** » Sat Oct 03, 2015 5:42 pm

Rseding91 wrote:That's by design. Previously they would die: https://forums.factorio.com/forum/vie ... die#p16823

It's a mechanic to prevent biters from building up over time and never getting anywhere slowing down the game.

Yeah, but there's no obvious reason for them to do that in the situation in the video.

Nic wrote:https://www.youtube.com/watch?v=53P8oPSXtjQ

Please post the save where you can reproduce this situation.

Nic · Post by **Nic** » Sat Oct 03, 2015 7:45 pm

Oxyd wrote:
Please post the save where you can reproduce this situation.

http://factorio.nicmd.de/Biter_Bug.zip

just run upwards to the biter nests close to the copper deposit. It works every time on my PC.

Post by **Oxyd** » Mon Oct 05, 2015 9:50 am

Okay, fixed in 0.12.11.

This was triggered by a piece of code that deletes units like this when they're far away from their spawner and can't return back for some reason. In these cases, we generally want to just remove these units as they would just keep hogging the CPU whilst stuck in some weird place that made it impossible for them to return to their spawner in the first place. The bug was that this code didn't check whether the biter even wants to go back to its spawner, and happily removed biters mid-attack.

Nic · Post by **Nic** » Mon Oct 05, 2015 2:10 pm

Oxyd wrote:Okay, fixed in 0.12.11.

This was triggered by a piece of code that deletes units like this when they're far away from their spawner and can't return back for some reason. In these cases, we generally want to just remove these units as they would just keep hogging the CPU whilst stuck in some weird place that made it impossible for them to return to their spawner in the first place. The bug was that this code didn't check whether the biter even wants to go back to its spawner, and happily removed biters mid-attack.

Good to hear.

Thank you for this detailed explanation - it is very interesting

Kane · Post by **Kane** » Mon Oct 05, 2015 2:45 pm

Thanks I was getting this too before was not sure if it was just the cleanup being derpy or not.

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