Simulating smoother character movement?

Help and Feedback Scripting Support
#21

I used one of the scripts and I keep getting this error on line 55
“moveVelocity = math.lerp( moveVelocity, targetMoveVelocity, math.clamp(dt * moveAcceleration, 0, 1) )”

 14:30:17.548  Players.Varsyte.PlayerScripts.MovementControl:55: attempt to call a nil value  -  Client - MovementControl:55

This is the code:

local RunS = game:GetService("RunService")
local InputS = game:GetService("UserInputService")

local player = game.Players.LocalPlayer
local camera = game.Workspace.CurrentCamera
local character = player.Character or player.CharacterAdded:Wait()

local targetMoveVelocity = Vector3.new()
local moveVelocity = Vector3.new()
local moveAcceleration = 8

player.CharacterAdded:Connect(function(_character)
	character = _character
end)

local walkKeyBinds = {
	Forward = { Key = Enum.KeyCode.W, Direction = Enum.NormalId.Front },
	Backward = { Key = Enum.KeyCode.S, Direction = Enum.NormalId.Back },
	Left = { Key = Enum.KeyCode.A, Direction = Enum.NormalId.Left },
	Right = { Key = Enum.KeyCode.D, Direction = Enum.NormalId.Right }
}

local function getWalkDirectionCameraSpace()
	local walkDir = Vector3.new()

	for keyBindName, keyBind in pairs(walkKeyBinds) do
		if InputS:IsKeyDown(keyBind.Key) then
			walkDir += Vector3.FromNormalId( keyBind.Direction )
		end
	end

	if walkDir.Magnitude > 0 then --(0, 0, 0).Unit = NaN, do not want
		walkDir = walkDir.Unit --Normalize, because we (probably) changed an Axis so it's no longer a unit vector
	end

	return walkDir
end

local function getWalkDirectionWorldSpace()
	local walkDir = camera.CFrame:VectorToWorldSpace( getWalkDirectionCameraSpace() )
	walkDir *= Vector3.new(1, 0, 1) --Set Y axis to 0

	if walkDir.Magnitude > 0 then --(0, 0, 0).Unit = NaN, do not want
		walkDir = walkDir.Unit --Normalize, because we (probably) changed an Axis so it's no longer a unit vector
	end

	return walkDir
end

local function updateMovement( dt )
	local humanoid = character:FindFirstChild("Humanoid")
	if humanoid then
		local moveDir = getWalkDirectionWorldSpace()
		targetMoveVelocity = moveDir
		moveVelocity = math.lerp( moveVelocity, targetMoveVelocity, math.clamp(dt * moveAcceleration, 0, 1) )
		humanoid:Move( moveVelocity )
	end
end	

RunS.RenderStepped:Connect(updateMovement)
2 Likes
#22

Hi,
it looks like the culprit here is your attempt to call “math.lerp”. I was unable to find this function in the documentation: math | Documentation - Roblox Creator Hub

#23

why dont works in mobile

…

#24

because it only accepts keyboard input, theres nothing in there for mobile

#25

Thank you so much for the script, because this post is just a mess.
But for some reason, my character isn’t able to jump anymore, once i use this script. Do you have any solutions? I couldn’t fix it myself.

#26

okay, for everyones sanity, here’s a version that does not have the bug of slowing down when looking up/down and works on mobile:

local targetMoveVelocity = Vector3.new()
local moveVelocity = Vector3.new()
local Dir = CFrame.Angles(0,0,0)
local moveAcceleration = 5
local stopDecel = 10

local plr = game:GetService("Players").LocalPlayer
local RunS = game:GetService("RunService")
local InputS = game:GetService("UserInputService")
local CAS = game:GetService("ContextActionService")
local ctrlModule = require(plr:WaitForChild("PlayerScripts").PlayerModule:WaitForChild("ControlModule"))

local character = plr.Character or plr.CharacterAdded:Wait()
local camera = game.Workspace.CurrentCamera

local function lerp(a, b, t) return a + (b - a) * t end

local function getWalkDirectionCameraSpace()
	local walkDir = ctrlModule:GetMoveVector()

	if walkDir.Magnitude > 0 then
		walkDir = Vector3.new(walkDir.X, 0, walkDir.Z).Unit * walkDir.Magnitude
		if walkDir.Magnitude > 1 then
			walkDir = walkDir.Unit
		end
	end

	return walkDir
end

local function getWalkDirectionWorldSpace()
	local walkDir = camera.CFrame:VectorToWorldSpace(getWalkDirectionCameraSpace())

	if walkDir.Magnitude > 0 then
		walkDir = Vector3.new(walkDir.X, 0, walkDir.Z).Unit * walkDir.Magnitude
		if walkDir.Magnitude > 1 then
			walkDir = walkDir.Unit
		end
	end

	return walkDir
end

local function noY(vec:Vector3)
	return Vector3.new(vec.X,0,vec.Z)
end

local function updateMovement(dt)
	local humanoid = character:FindFirstChild("Humanoid")
	if humanoid then
		local moveDir = getWalkDirectionWorldSpace() 
		local deceleration = lerp(moveAcceleration, stopDecel, 1 - moveDir.Magnitude)
		targetMoveVelocity = moveDir
		moveVelocity = lerp(moveVelocity, targetMoveVelocity, math.clamp(dt * deceleration, 0, 1))
		humanoid:Move(moveVelocity)
	end
end

RunS.RenderStepped:Connect(updateMovement)
14 Likes
#27

Absolutely Goated.

Thirty Minimum Characters :japanese_goblin:

1 Like