How to code an instance to walk to a specific coordinate?

[FurryEskimo]

Hello, I'm currently working on some brain code, and I've been having some trouble and would appreciate some insight. I'm looking to code an instance to walk to a pre-defined coordinate (x, y, z), but don't know what behavior I should/can use.

Most of the code I've found (like the leash behavior) focuses on making an instance walk towards another instance, rather than a specific coordinate.

I'd appreciate any help you can offer, thanks!

[FurryEskimo]

Can anyone offer help with brains in general?

[_zwb]

Maybe you can use inst.components.locomotor:GoToPoint(Point(x,y,z)) ?

[FurryEskimo]

1 hour ago, _zwb said:

Maybe you can use inst.components.locomotor:GoToPoint(Point(x,y,z)) ?

Yeah, I figure it's something like that, but I haven't figured out how to code that yet in the brain.
 

function Traveler_Brain:OnStart()
    local root =
        PriorityNode(
        {
            --Check if the character should panic.
            WhileNode(function() return self.inst.components.hauntable and self.inst.components.hauntable.panic end, "PanicHaunted", 
                Panic(self.inst)
            ),

            WhileNode(function() return self.inst:HasTag("onopen") end, "StandStill",
                StandStill(self.inst)
            ),

            --Check if the character should travel.
            WhileNode(function() return self.inst.Traveler_Stats.LevelData.TravelCoordinates ~= nil end, "ShouldTravel",
                SequenceNode{
                    --Travel to the destination.
                    DoAction(self.inst, function() return GoToPoint(self.inst, self.inst.Traveler_Stats.LevelData.TravelCoordinates) end, "Travel To Destination"),
                    --Wander until traveltime is zero or less.
                    WhileNode(function() return self.inst.traveltime > 0 end, "Wander Until TravelTime Ends",
                        Wander(self.inst, function() return self.inst.Traveler_Stats.LevelData.TravelCoordinates end, MAX_WANDER_DIST)
                    ),
                }
            ),
            
            --Check if the character should go home.
            WhileNode(function() return ShouldGoHome(self.inst) end, "ShouldGoHome",
                DoAction(self.inst, function() return GoHomeAction(self.inst) end, "go home", true)
            ),
            
            FaceEntity(self.inst, GetFaceTargetFn, KeepFaceTargetFn),
            
            --More behaviors as needed.
        }, .25)

    self.bt = BT(self.inst, root)
end

 

[FurryEskimo]

OMG, I THINK I GOT IT!!

This took me Hours, but I think I got it!!!!
Is it perfect?  No, absolutely not, but this was so irksome, I'm so happy, caused like five different files to crash just to get this far.  Wooooo~

If you know how to further improve this, please say something.  (Turns out part of the issue was generating a coordinate and storing it in a custom array, rather than inst.pt, which is important for, some reason.)

require "behaviours/doaction"
require "behaviours/wander"
require "behaviours/standstill"

local MAX_WANDER_DIST = 5  --Adjust this distance as needed.  --Note: Add wander/stand still/function to return home.

local TravelerBrain = Class(Brain, function(self, inst)
    Brain._ctor(self, inst)
end)

function TravelerBrain:OnStart()

    local root =
        PriorityNode(
        {

        --Traveling.
        WhileNode(function() return self.inst.components.locomotor and self.inst.pt end, "",
            ChattyNode(self.inst, {""},
                ActionNode(function ( ... )
                --    print("Traveling.")
                 --   print(self.pt)
                    self.inst.components.locomotor:GoToPoint(self.pt, nil, false)
                end))),

            --Add more behaviors here as needed.
        }, .25)

    self.bt = BT(self.inst, root)
end

return TravelerBrain

 

[FurryEskimo]

Hmm, there's seems to be a downside to this.  I can see that they're only traveling while near the player.  Once they get around two screens away they halt.  Perhaps there's a way to ensure the game will continue to sim them?  There are lots of mods that have AI followers you leave at a location, does anyone know how they work?  (I haven't used many of those mods, so I haven't reviewed their code.)

Edited September 10, 2023 by FurryEskimo

[FurryEskimo]

Some general improvements to this code I figured out.  Turns out the instance was walking, but only to (0, 0, 0).
Inside the instance:

inst.pt = Vector3(x, y, z)  --Create a Vector3 object for the location.
inst.components.knownlocations:RememberLocation("Destination_1", inst_pt, false)

Inside the brain:

require "behaviours/doaction"
require "behaviours/wander"
require "behaviours/standstill"

local MAX_WANDER_DIST = 5  --Adjust this distance as needed.  --Note: Add wander/stand still/function to return home.

local TravelerBrain = Class(Brain, function(self, inst)
    Brain._ctor(self, inst)
end)

function TravelerBrain:OnStart()
	local destination = self.inst.components.knownlocations:GetLocation("Destination_1")

    local root =
        PriorityNode(
        {

        --Traveling.
        WhileNode(function() return self.inst.components.locomotor and destination end, "",
            ChattyNode(self.inst, {""},
                ActionNode(function ( ... )
                    self.inst.components.locomotor:GoToPoint(destination, nil, false)
                end))),

            --Add more behaviors here as needed.
        }, .25)

    self.bt = BT(self.inst, root)
end

return TravelerBrain

This still isn't perfect, but it took me all day to figure out I needed to use the Vector3 code.  Hope this is helpful to someone.