Can't get dashing model to circle behind character's HRP

[dzhann757 (Apollo)]

-- Local Script
local ReplicatedStorage = game:GetService("ReplicatedStorage")
local UserInputService = game:GetService("UserInputService")

local DashFunction = script:WaitForChild("Dash_Function")

local LocalPlayer = game.Players.LocalPlayer
local Custom_Dash_Key = LocalPlayer:WaitForChild("Dash_Key")
local Dash_Key = Enum.KeyCode[Custom_Dash_Key.Value]

UserInputService.InputBegan:Connect(function(input, processed)
	if processed == true then return end
	
	if input.KeyCode == Dash_Key then
		local Dash_Direction = "Front"

		if UserInputService:IsKeyDown(Enum.KeyCode.S) then
			Dash_Direction = "Back"

		elseif UserInputService:IsKeyDown(Enum.KeyCode.A) then
			Dash_Direction = "Left"

		elseif UserInputService:IsKeyDown(Enum.KeyCode.D) then
			Dash_Direction = "Right"
		end

		DashFunction:InvokeServer(Dash_Direction)
	else
		return
	end
end)

Custom_Dash_Key.Changed:Connect(function(new_DashKey)
	Dash_Key = Enum.KeyCode[new_DashKey]
end)

-- Server Script
local TweenService = game:GetService("TweenService")
local ReplicatedStorage = game:GetService("ReplicatedStorage")

local Sounds = ReplicatedStorage:WaitForChild("Sounds")
local Dash_SFX = Sounds:WaitForChild("Dash")

local Modules = ReplicatedStorage:WaitForChild("Modules")
local Miscellaneous_Modules = Modules:WaitForChild("Miscellaneous_Modules")
local Miscellaenous = require(Miscellaneous_Modules:WaitForChild("Miscellaneous"))

local Models = ReplicatedStorage:WaitForChild("Models")
local Dash_Circle = Models:WaitForChild("Dash_Circle")
local Mini_Dash_Circle = Models:WaitForChild("Mini_Dash_Circle")

local Dash_Function = script.Parent

local character = Dash_Function.Parent.Parent
local Humanoid = character:FindFirstChild("Humanoid")
local HRP = character:FindFirstChild("HumanoidRootPart")

local debounce = false
local COOLDOWN = 8

local Dash_Duration = 0.35
local Rate = 0.01

local function Clone_Dash_Circles(player_HRP)
	local HRP_CFrame = HRP.CFrame
	
	local Dash_Circle_Clone = Dash_Circle:Clone()
	local Mini_Dash_Circle_Clone = Mini_Dash_Circle:Clone()
	
	task.spawn(function()
		Mini_Dash_Circle_Clone.CFrame = HRP_CFrame + Vector3.new(0, 0, 2)
		Mini_Dash_Circle_Clone.Parent = workspace
	end)
	
	task.spawn(function()
		Dash_Circle_Clone.CFrame = HRP_CFrame + Vector3.new(0, 0, 4)
		Dash_Circle_Clone.Parent = workspace
	end)
end

Dash_Function.OnServerInvoke = function(DashDirection)
	if debounce == true then return end
	debounce = true
	
	task.spawn(Miscellaenous.Play_Sound, Dash_SFX, HRP)
	task.spawn(Clone_Dash_Circles, HRP)

	local BodyVelocity = Instance.new("BodyVelocity")
	BodyVelocity.MaxForce = Vector3.new(100000, 0, 100000)
	BodyVelocity.Parent = HRP

	local DashStrength = 50
	local MinimumDashStrength = DashStrength * 0.15
	local AmountofIterations = DashStrength / Rate
	local RemovalofStrengthPerIteration = DashStrength / AmountofIterations

	for i = 0, Dash_Duration, Rate do
		if DashDirection == "Front" then
			BodyVelocity.Velocity = HRP.CFrame.LookVector * DashStrength
		elseif DashDirection == "Back" then
			BodyVelocity.Velocity = (HRP.CFrame.LookVector * -1) * DashStrength
		elseif DashDirection == "Right" then
			BodyVelocity.Velocity = HRP.CFrame.RightVector * DashStrength
		elseif DashDirection == "Left" then
			BodyVelocity.Velocity = (HRP.CFrame.RightVector * -1) * DashStrength
		end

		if DashStrength > MinimumDashStrength then
			DashStrength -= RemovalofStrengthPerIteration
			if DashStrength < MinimumDashStrength then
				DashStrength = MinimumDashStrength
			end
		end

		task.wait(Rate)
	end
	
	BodyVelocity:Destroy()
	task.wait(COOLDOWN)
	debounce = false
end

I’m new to modeling and I’m trying to make a dash effect. The large circle will be the most behind the player and the mini dash circle will be a little bit behind the player (both using the player’s HRP’s CFrame) but I can’t get them to center and it’s very off. I don’t know what to do?

[Zolyphony]

maybe try using * instead of + when you have the lines
Mini_Dash_Circle_Clone.CFrame = HRP_CFrame + Vector3.new(0, 0, 2)
and
ash_Circle_Clone.CFrame = HRP_CFrame + Vector3.new(0, 0, 4)

i recently did something like this where i used + aswell but it wouldnt place correctly.

[dzhann757 (Apollo)]

Wait I don’t get it. How does that work though? I don’t understand the difference between Multiplying the CFrames and just simply adding / subracting them

[dzhann757 (Apollo)]

I just tried it and it actually worked. How though? :0

[Zolyphony]

i actually have no idea. But using * with Cframes isn’t multiplication. its something called composition instead. Maybe you can do some research on it if you’re still interested because ive got no clue how to explain it

[dzhann757 (Apollo)]

Oh okay, I’ll try to do more research on it