Could someone help with creating momentum/inertia in a sonic like character controller?

Help and Feedback Scripting Support
#1

You can write your topic however you want, but you need to answer these questions:

  1. What do you want to achieve? Keep it simple and clear!

Ive recently been making a sonic character controller (currently dont have jumping, or wall collision) but I have floor collisions, movement and slope alignment. Only problem, I want to create momentum/inertia when on slopes (i.e, having the character slide down when speed is too slow)

  1. What is the issue? Include screenshots / videos if possible!
    I don’t necessarily know how to go about doing this, as I lack experience or the knowledge to do so. Im not asking anybody to make this for me, But i would greatly appreciate it if somebody could help point me in the right direction at least.

  2. What solutions have you tried so far? Did you look for solutions on the Developer Hub?

There are currently no solutions on the dev hub, and I’ve looked a lot of places for help :confused: I’m not sure what it is I’m supposed to be doing. Sorry if it’s a bit messy but here’s my code.

After that, you should include more details if you have any. Try to make your topic as descriptive as possible, so that it’s easier for people to help you!


local UIS = game:GetService("UserInputService")
local RS = game:GetService("ReplicatedStorage")

--

local Character = script.Parent
local Humanoid = Character:WaitForChild("Humanoid")
local HRP = Character:WaitForChild("HumanoidRootPart")

Character.Parent = RS

local MoveDirection = Humanoid.MoveDirection
local lastMoveDirection 

local Sonic = Instance.new("Model",workspace)
Sonic.Name = "Character"

local Hitbox = Instance.new("Part",Sonic)
Sonic.PrimaryPart = Hitbox

Hitbox.Size = Vector3.new(0.25,5,0.25)
Hitbox.Position = Vector3.new(0,20,0)
Hitbox.CanCollide = false
Hitbox.CanQuery = false

--

local rParams = RaycastParams.new()
rParams.FilterType = Enum.RaycastFilterType.Exclude
rParams.FilterDescendantsInstances = {Character,Sonic}

local raycast
local lastNormal = nil

local Align = Instance.new("AlignOrientation",Hitbox)
Align.Attachment0 = Instance.new("Attachment",Hitbox)
Align.Mode = Enum.OrientationAlignmentMode.OneAttachment
Align.Responsiveness = 50

local bv = Instance.new("BodyVelocity",Hitbox)
bv.MaxForce = Vector3.new(99999,99999,99999)
bv.Velocity = Vector3.new()

local Camera = workspace.CurrentCamera
Camera.CameraSubject = Hitbox

--

local Groundspeed = 0
local ySpeed = 0
local AirSpeed = 0

local Angle = 0
local Direction = 0

local groundVector = Vector3.zero
local upVector = Vector3.zero

--

----

local c1 = coroutine.create(function()
	local function _()
		
		MoveDirection = Humanoid.MoveDirection
		
		Angle = math.deg(math.acos(Hitbox.CFrame.UpVector:Dot(Vector3.new(0,1,0))))
		
		groundVector = Hitbox.CFrame.LookVector
		
		if MoveDirection.Magnitude > 0 then
			Align.CFrame = CFrame.lookAlong(Hitbox.Position,Vector3.new(0,1,0):Cross(MoveDirection):Cross(Hitbox.CFrame.UpVector),Hitbox.CFrame.UpVector)
			lastMoveDirection = MoveDirection
		end
		
		if Vector3.yAxis:Dot(Hitbox.CFrame.LookVector) < 0 then
			Direction = -1
		else
			Direction = 1
		end
		
		if Humanoid.MoveDirection.Magnitude > 0 then	
			Groundspeed += 0.4
			if Groundspeed > 40 then
				Groundspeed = 40
			end
		else
			Groundspeed -= 0.6
			if Groundspeed < 0 then
				Groundspeed = 0
			end
		end
		
		return
	end
	
	while game:GetService("RunService").Heartbeat:Wait() do
		_()
	end
end)

local c2 = coroutine.create(function()
	local function _()
		
		raycast = workspace:Raycast(Hitbox.Position + Hitbox.CFrame.UpVector * 2.5,Hitbox.CFrame.UpVector * (-5 - Hitbox.Velocity.Magnitude/10),rParams)
		
		if raycast then
			if lastNormal ~= raycast.Normal then
				lastNormal = raycast.Normal
				bv.Velocity = Vector3.new()
			end
			
			Hitbox.Position = raycast.Position + Hitbox.CFrame.UpVector * 2.5
			Hitbox.CFrame = CFrame.fromMatrix(Hitbox.Position,Hitbox.CFrame.LookVector:Cross(raycast.Normal),raycast.Normal,Hitbox.CFrame.RightVector:Cross(raycast.Normal))
			ySpeed = 0
		else
			if lastNormal ~= nil then
				lastNormal = nil
				bv.Velocity = Vector3.new()
			end
			ySpeed -= 0.6
			Hitbox.CFrame = CFrame.fromMatrix(Hitbox.Position,Hitbox.CFrame.LookVector:Cross(Vector3.new(0,1,0)),Vector3.new(0,1,0),Hitbox.CFrame.RightVector:Cross(Vector3.new(0,1,0)))
		end
		
		upVector = Vector3.new(0,1,0)

		bv.Velocity = (groundVector * Groundspeed) + (upVector * ySpeed)
		
		return
	end	
	
	while game:GetService("RunService").Heartbeat:Wait() do
		_()
	end
	
end)

coroutine.resume(c1)
coroutine.resume(c2)

Please do not ask people to write entire scripts or design entire systems for you. If you can’t answer the three questions above, you should probably pick a different category.