No Player Collision -- Roblox

-- Player Collision false
-- Put this in ServerScriptService

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

PhysicsService:CollisionGroupSetCollidable("Players", "Players", false)

game.Players.PlayerAdded:Connect(function(plr)
    plr.CharacterAdded:Connect(function(char)
        repeat wait(1) until char:WaitForChild("Humanoid")

        for _, characterPart in pairs(char:GetChildren())do
            if characterPart:IsA("BasePart")then
                PhysicsService:SetPartCollisionGroup(characterPart, "Players")
            end
        end
    end)
end)