Another relative positioning bug... again. (Relative to body parts + welds)

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#1

I don’t understand but I can’t seem to stop running into relative part positioning! Basically I am trying to position a part consistently on a certain part of the arm (the video below has just testing values, realistically it will be positioned more or less in the right grip attachment position). The problem is if I turn / move the position changes when I use the ability again to summon another part its different. I have tried welding differently, positioning relative to other parts, using cframe instead, nothing seems to make a working outcome. Here is a video showcasing my issue:

Here is my code (for the part positioning):

local tool = script.Parent
local ServerStorage = game:GetService("ServerStorage")
local TweenService = game:GetService("TweenService")
local ModelsFolder = ServerStorage.Models.divineBlast
local RemoteEvent = tool.divineBlastEvent
local hitbox = ServerStorage.Hitboxes.divineBlastHitbox
local reverseShockwave = ModelsFolder.divineBlastReverseShockwave
local energyBall = ModelsFolder.divineBlastBall
local energyLaser = ModelsFolder.divineBlastLaser
local pointlight = ModelsFolder.divineLight

local reverseShockwaveTweenInfo = TweenInfo.new(1,Enum.EasingStyle.Linear,Enum.EasingDirection.In,0,false,0)
local energyBallStartTweenInfo = TweenInfo.new(1,Enum.EasingStyle.Linear,Enum.EasingDirection.In,0,false,0)
--local energyLaserStartTweenInfo = TweenInfo(0.25,Enum.EasingStyle.Linear,Enum.EasingDirection.In,0,false,0)
local energyEndTweenInfo = TweenInfo.new(0.5,Enum.EasingStyle.Linear,Enum.EasingDirection.In,0,false,0)
local pointLightTweenInfo = TweenInfo.new(1,Enum.EasingStyle.Linear,Enum.EasingDirection.In,0,false,0)

RemoteEvent.OnServerEvent:Connect(function(player: Player, eventType: string)
	local character = player.Character
	local humanoid = character:FindFirstChild("Humanoid")
	local humanoidRootPart = character:FindFirstChild("HumanoidRootPart")
	local rightArm = character:FindFirstChild("Right Arm")
	local energyBallPosition = rightArm.RightGripAttachment
	
	if eventType == "BlastStart" then
		local energyBallClone = energyBall:Clone()
		local pointLightClone = pointlight:Clone()
		local energyBallWeld = Instance.new("WeldConstraint")


		energyBallClone.Position = rightArm.Position + Vector3.new(-1, 0, 0)
		energyBallClone.Parent = character
		energyBallWeld.Name = "EnergyBallWeld"
		energyBallWeld.Parent = rightArm
		energyBallWeld.Part0 = energyBallClone
		energyBallWeld.Part1 = rightArm


		local energyBallTween = TweenService:Create(energyBallClone,energyBallStartTweenInfo,{Size = Vector3.new(1,1,1)})
		energyBallTween:Play()
	end
	--RemoteEvent:FireClient(player)
end)

Any help or tips are appreciated!

#2 
energyBallClone.Position = rightArm.Position + Vector3.new(-1, 0, 0)

It’s because of this line. I don’t know if it makes sense but youre moving the ball -1 studs on the x grid of the world instead of its relative direction. Try this.

energyBallClone.Position = rightArm.Position + (Vector3.new(-1, -1, -1) * rightArm.CFrame.LookVector)
#3

well that works for the most part but on the very first use it seems to be inaccurate.

#4

Could you try replacing Position with CFrame in that one line?

#5

Doesn’t seem to change much. :person_shrugging: