Nextbot Problems (attempt to yield across C-call boundary)

[Mr.Pilot]

https://pastebin.com/fmdPdxwk

So, I'm doing something pretty weird with Nextbot. I'm trying to make a library of "schedules" so to speak so that I can call them later on in other parts of the script.

For instance, the way I get this npc to do the walk animation would be to do:

entity:updateAction("walk", Vector(0, 0, 0)

someplace else in the script. But when I do that, I seem to get this error:

[ERROR] gamemodes/base/entities/entities/base_nextbot/sv_nextbot.lua:328: attempt to yield across C-call boundary
  1. yield - [C]:-1
   2. MoveToPos - gamemodes/base/entities/entities/base_nextbot/sv_nextbot.lua:328
    3. doWalk - gamemodes/swagadventures/entities/entities/nextbot_npc.lua:33
     4. updateAction - gamemodes/swagadventures/entities/entities/nextbot_npc.lua:22
      5. unknown - gamemodes/swagadventures/init.lua:46
       6. unknown - lua/includes/modules/concommand.lua:54

Any idea?

[Donkie]

You can't run MoveToPos anywhere you like, it has to be in the RunBehaviour hook. Thus you want to store the go-to pos in some variable on the entity then use that in the RunBehaviour hook like:
function ENT:RunBehaviour()
while true do
if self.scheduledWalk then
self:MoveToPos(self.scheduledWalk)
self.scheduledWalk = nil -- Reset so it doesn't get called multiple times
end
end
end

function ENT:DoWalk(pos)
self.scheduledWalk = pos
end
If you're expecting multiple walk calls before one is finished you might want to store them in a table or something so they get called sequentially. That's up to you.

[Mr.Pilot]

Yeah that ended up working. MoveToPos doesn’t stop until it gets to where you tell it to go. Is there a way to stop it before it ends if I give it a new location mid-walking?

[Donkie]

MoveToPos is a lua function so your best bet is copying its source garrysmod/sv_nextbot.lua at master · Facepunch/garrysmod · GitHu.. to your entity and then add some check in the loop there to quit it prematurely.

[Mr.Pilot]

It seems that MoveToPos runs on a while loop and until the path is complete (the while loop ends), nothing can get updated. I wonder how you'd disrupt a while loop with a changed variable.

[Donkie]

You can just call break in it once your condition is met.

[Mr.Pilot]

I gave up on Nextbot, it sucks and it sucks even more that some things on the base_ai are broken because of it. But, thanks anyways!