Bird Brain, Tag and Modmain - Need Help

[RedTarantula]

Hello! I need some help with manipulating creatures that already exist in-game.

For a character that I am creating, I need to add a tag to the birds' prefab and change the birdbrain file as well. I've seen some mods that change those things directly on modmain and I believe that's so it is easier to be compatible with other mods that change existing prefabs and brains.

I know how to change those things by recreating the prefab/brain file on my mod's scripts folder, but is there a way of doing it with "AddPrefabPostInit" and that kind of thing? I still don't know how those functions work. I don't know how to add a tag, to add a function to a creature or to actually replace part of the code.

 

For example. The birdbrain file contains this:

Spoiler

local function ShouldFlyAway(inst)
    return not (inst.sg:HasStateTag("sleeping") or
                inst.sg:HasStateTag("busy") or
                inst.sg:HasStateTag("flight"))
        and (TheWorld.state.isnight or
            (inst.components.health ~= nil and inst.components.health.takingfiredamage and not (inst.components.burnable and inst.components.burnable:IsBurning())) or
            FindEntity(inst, SEE_THREAT_DIST, nil, nil, { "notarget", "INLIMBO"}, { "player", "monster", "scarytoprey" }) ~= nil)
end

 

And I would like to add a tag to the birds' prefab -> "birdfriendly"

And so replace the ShouldFlyAway(inst) function from that to:

Spoiler

local function ShouldFlyAway(inst)
    return not (inst.sg:HasStateTag("sleeping") or
                inst.sg:HasStateTag("busy") or
                inst.sg:HasStateTag("flight"))
        and (TheWorld.state.isnight or
            (inst.components.health ~= nil and inst.components.health.takingfiredamage and not (inst.components.burnable and inst.components.burnable:IsBurning())) or
            FindEntity(inst, SEE_THREAT_DIST, nil, nil, { "notarget", "INLIMBO", "birdfriendly" }, { "player", "monster", "scarytoprey" }) ~= nil)
end

 

Is there a way of doing all of that on modmain or do I need to recreate the prefab+brain in my scripts folder?

 

Thanks in advance!

[Aquaterion]

for brains you use

AddBrainPostInit(brain, fn)

for prefabs you do

AddPrefabPostInit(prefabname, fn)

 

However I'm not sure how modifying brains post init works exactly..

But for a list of all these PostInit methods that you can use, you can check scripts/modutil.lua

 

[RedTarantula]

Bump

Thanks for the reply. I'm studying more the file you told me to check, Aquaterion. But if anyone can explain a bit more I'd appreciate it.

I still don't know how to replace, add or remove functions and components on modmain. I assume "AddPrefab" would ADD a new function to the prefab, but how do I change or remove an existing one? And how do I simply add a tag to a creature?

[Aquaterion]

AddPrefabPostInit(prefabname, fn) would run the given function on that prefab every time 1 spawns so:
 

local function modifyBird(inst)
	inst:AddTag("birdfriendly")
	if not GLOBAL.TheWorld.ismastersim then--before this if = clientside stuff | after this if = serverside stuff
		return inst
	end
end

AddPrefabPostInit("robin", modifyBird)

every time a robin spawns, modifyBird will be called resulting in it having a new tag