How to make one beam grow from one side and locked in place

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#1

first of all, im trying to make a gaster blaster which shoots a beam apon spawning, only problem is that its very hard to attack the beam to one place,

local TweenService = game:GetService("TweenService")
local part = script.Parent

local function blast(part)
	local beam = part.Beam
	local sizedata = 100
	beam.CFrame = part.CFrame
	beam.Size = beam.Size + Vector3.FromAxis(Enum.Axis.Z) * sizedata
	beam.Position = part.Position + Vector3.FromNormalId(Enum.NormalId.Left) * sizedata / 2
	local sizeTweenInfo = TweenInfo.new(1, Enum.EasingStyle.Linear, Enum.EasingDirection.Out)
	local sizeTweenGoal = {Size = beam.Size + Vector3.FromAxis(Enum.Axis.Z) * sizedata}
	local sizeTween = TweenService:Create(beam, sizeTweenInfo, sizeTweenGoal)
	local positionTweenInfo = TweenInfo.new(1, Enum.EasingStyle.Linear, Enum.EasingDirection.Out)
	local positionTweenGoal = {Position = part.Position + Vector3.FromNormalId(Enum.NormalId.Left) * sizedata / 2}
	local positionTween = TweenService:Create(beam, positionTweenInfo, positionTweenGoal)
	sizeTween:Play()
	positionTween:Play()
	sizeTween.Completed:Wait()
	positionTween.Completed:Wait()
end

blast(part)
#2

what i mean is to attach the beam to the gaster blaster itself

#3

You can use weld constraints or alternatively if you just want the visual effects making a ray cast visible would work too. A ray is just a straight line after all

#4

is there any way to implement it?

#5

heres a video

#6
#7

im still confused, can you explain?