Code:

-- CREATING THE BEAM:
function beam(NearestInteractable)
    if not NearestInteractable:FindFirstChild("Beam") then 
        wait()
        if NearestInteractable.InteractionSettings.RenderSettings.Beam.Value == false then return end
        
        if not game.Players.LocalPlayer.Character.HumanoidRootPart:FindFirstChild("BeamAttachment1") then
            A1 = Instance.new("Attachment", game.Players.LocalPlayer.Character.HumanoidRootPart)
            A1.Name = "BeamAttachment1"
        else
            A1 = game.Players.LocalPlayer.Character.HumanoidRootPart:FindFirstChild("BeamAttachment1")
        end
        
        if not NearestInteractable:FindFirstChild("BeamAttachment2") then
            A2 = Instance.new("Attachment", NearestInteractable)
            A2.Name = "BeamAttachment2"
        else
            A2 = NearestInteractable:FindFirstChild("BeamAttachment2")
        end
        if not NearestInteractable:FindFirstChildOfClass("Beam") then
            for _, v in pairs(interacts) do
                if v.Parent:FindFirstChildOfClass("Beam") then
                    v.Parent:FindFirstChildOfClass("Beam").Name = "BeamDele"
                    v.Parent:FindFirstChildOfClass("Beam").Transparency = NumberSequence.new{
                        NumberSequenceKeypoint.new(0, v.Parent:FindFirstChildOfClass("Beam").Transparency),
                        NumberSequenceKeypoint.new(0.01, 0.2),
                        NumberSequenceKeypoint.new(0.02, 0.4),
                        NumberSequenceKeypoint.new(0.03, 0.6),
                        NumberSequenceKeypoint.new(0.04, 0.8),
                        NumberSequenceKeypoint.new(0.05, 1)
                    }
                    wait()
                    v.Parent:FindFirstChildOfClass("Beam"):Destroy()
                end
            end
            wait(.1)
            Beam = Instance.new("Beam", NearestInteractable)
            Beam.Width0 = 0.1
            Beam.Width1 = 0.1
            Beam.Segments = 155
            Beam.FaceCamera = true
            Beam.Transparency = NumberSequence.new(1)
            Beam.Texture = "http://www.roblox.com/asset/?id=5812000512"
            Beam.TextureLength = 0.5
            Beam.TextureSpeed = 0
            Beam.Attachment0 = A1
            Beam.Attachment1 = A2
        end
        local numbervalue = script:WaitForChild("Number1")
        local newTween = ts:Create(numbervalue, TweenInfo.new(0.5), {Value = 0})
        
        numbervalue:GetPropertyChangedSignal("Value"):Connect(function()
            Beam.Transparency = NumberSequence.new(numbervalue.Value)
            if NearestInteractable.InteractionSettings.RenderSettings.SecondGui.Value == false then fake.Enabled = false end
        end)
        
        newTween:Play()
        newTween.Completed:Wait()
        return
    end
    return
end
-- DELETING THE BEAM
for i,v in pairs(last_door:GetChildren()) do
    if v:IsA("Beam") or v:IsA("SelectionBox") then
        spawn(function()
            v.Name = "BeamDele"
            coroutine.wrap(function(toDelete)
                pcall(function()
                    if toDelete:IsA("Beam") then
                        local numbervalue = script:WaitForChild("Number1")
                        numbervalue.Value = 0
                        spawn(function()
                            wait(.25)
                            toDelete:Destroy()
                        end)
                        toDelete.Transparency = NumberSequence.new{
                            NumberSequenceKeypoint.new(0.025, .1),
                            NumberSequenceKeypoint.new(0.05, .2),
                            NumberSequenceKeypoint.new(0.075, .3),
                            NumberSequenceKeypoint.new(0.1, .4),
                            NumberSequenceKeypoint.new(0.125, .5),
                            NumberSequenceKeypoint.new(0.15, .6),
                            NumberSequenceKeypoint.new(0.175, .7),
                            NumberSequenceKeypoint.new(0.2, .8),
                            NumberSequenceKeypoint.new(0.225, .9),
                            NumberSequenceKeypoint.new(0.25, 1)
                        }
                    else
                        local newTween = ts:Create(toDelete, TweenInfo.new(0.25, Enum.EasingStyle.Back), {Transparency = 1})
                        newTween:Play()
                        newTween.Completed:Wait()
                        if toDelete.Transparency >= 1 then
                            toDelete:Destroy()
                        else
                            local newTween = ts:Create(toDelete, TweenInfo.new(0.1, Enum.EasingStyle.Back), {Transparency = 1})
                            newTween:Play()
                            newTween.Completed:Wait()
                            toDelete:Destroy()
                        end
                    end
                end)
            end)(v)
        end)
        wait(.1)
    end
end

So basically, I have a beam at the first part. Then when player leaves the vicinity of the first part and enters the vicinity of the second part, I try destroying the beam in the first part and adding a new one to the other. Problem is, this method won't work as long as there is a beam in the first part, and when the player nears the second part, the first beam won't go transparent and destroy until a second after the second beam is created, therefore not allowing the second beam to take its place.

Anonymous