How to make a proper zombie horde system with PathfindingModifiers?

[obamagremlin (xvez)]

I’m working on a zombie system and I’m wondering how I can make actual realistic hordes of zombies that don’t clump up and form a “train” when chasing a player. My first attempt at this was to add a pathfinding “hitbox” with a pathfinding modifier inside it that prevents the zombies from pathfinding through each other.

However, this method did not seem to work, when I tried this out with 4 - 5 zombies, they kept “stuttering” and constantly recalculating their path and making weird movements. Below is the code I am currently using for the zombies.

local ServerStorage = game:GetService("ServerStorage")

local SimplePath = require(ServerStorage.Modules.SimplePath)

local zombie = script.Parent
local humanoid = zombie:WaitForChild("Humanoid")
local humanoidRootPart = zombie:WaitForChild("HumanoidRootPart")

local Path = SimplePath.new(zombie)
Path.Visualize = true

while true do
	local nearestCharacter = Path.GetNearestCharacter(humanoidRootPart.Position)
	
	if nearestCharacter then
		if nearestCharacter.PrimaryPart then
			Path:Run(nearestCharacter.PrimaryPart.Position + nearestCharacter.PrimaryPart.AssemblyLinearVelocity * 0.15) -- Predict the player's movement.
		end
	end
	
	task.wait()
end

(Note that I am using the SimplePath module to achieve this.)

[obamagremlin (xvez)]

Fixed. You have to put the pathfinding modifier a little bit behind the zombie and resize it so that it is small. Note that this will still cause somewhat jittery movements, but it makes it 100x better.