DisablePlayerCollisions.lua

--!strict

local Players = game:GetService("Players")
local PhysicsService = game:GetService("PhysicsService")

-- Register & Set Collision Groups for our Characters
PhysicsService:RegisterCollisionGroup("Players")
PhysicsService:CollisionGroupSetCollidable("Players", "Players", false)

local function OnCharacterAdded(Character: Model): ()
	-- Not a great way, but we get back the Player that owns this Character
	local Player: Player = Players:GetPlayerFromCharacter(Character)
	
	-- See if the Character is fully loaded (All its Parts & Accessories are added)
	if not Player:HasAppearanceLoaded() then
		-- If it isn't we Yield until the Event Fires
		Player.CharacterAppearanceLoaded:Wait()
	end
	
	-- Loop through each Descendant and set each Part's CollisionGroup
	for _, Descendant in Character:GetDescendants() do
		if Descendant:IsA("BasePart") then
			Descendant.CollisionGroup = "Players"
		end
	end
end

local function OnPlayerAdded(Player: Player): ()
	-- If the Character is already added, we just run the callback right away
	if Player.Character then
		OnCharacterAdded(Player.Character)
	end
	
	-- Connect the callback so it runs the next time
	Player.CharacterAdded:Connect(OnCharacterAdded)
end


Players.PlayerAdded:Connect(OnPlayerAdded)