How default roblox walk system works?

[DeleteDMoonz (myz2die)]

Hey, I wanted to know how roblox default movement system works, how it exactly detect and move the character smoothly.
Also is it possible to disable or change it?

thanks

[HauntedAlaskan]

Here’s Roblox’s movement/animation system! You can disable this by deleting “Animate” from a Character once it spawns:

-- humanoidAnimatePlayEmote.lua

local Figure = script.Parent
local Torso = Figure:WaitForChild("Torso")
local RightShoulder = Torso:WaitForChild("Right Shoulder")
local LeftShoulder = Torso:WaitForChild("Left Shoulder")
local RightHip = Torso:WaitForChild("Right Hip")
local LeftHip = Torso:WaitForChild("Left Hip")
local Neck = Torso:WaitForChild("Neck")
local Humanoid = Figure:WaitForChild("Humanoid")
local pose = "Standing"

local EMOTE_TRANSITION_TIME = 0.1

local userAnimateScaleRunSuccess, userAnimateScaleRunValue = pcall(function() return UserSettings():IsUserFeatureEnabled("UserAnimateScaleRun") end)
local userAnimateScaleRun = userAnimateScaleRunSuccess and userAnimateScaleRunValue

local function getRigScale()
	if userAnimateScaleRun then
		return Figure:GetScale()
	else
		return 1
	end
end

local currentAnim = ""
local currentAnimInstance = nil
local currentAnimTrack = nil
local currentAnimKeyframeHandler = nil
local currentAnimSpeed = 1.0
local animTable = {}
local animNames = { 
	idle = 	{	
				{ id = "http://www.roblox.com/asset/?id=180435571", weight = 9 },
				{ id = "http://www.roblox.com/asset/?id=180435792", weight = 1 }
			},
	walk = 	{ 	
				{ id = "http://www.roblox.com/asset/?id=180426354", weight = 10 } 
			}, 
	run = 	{
				{ id = "run.xml", weight = 10 } 
			}, 
	jump = 	{
				{ id = "http://www.roblox.com/asset/?id=125750702", weight = 10 } 
			}, 
	fall = 	{
				{ id = "http://www.roblox.com/asset/?id=180436148", weight = 10 } 
			}, 
	climb = {
				{ id = "http://www.roblox.com/asset/?id=180436334", weight = 10 } 
			}, 
	sit = 	{
				{ id = "http://www.roblox.com/asset/?id=178130996", weight = 10 } 
			},	
	toolnone = {
				{ id = "http://www.roblox.com/asset/?id=182393478", weight = 10 } 
			},
	toolslash = {
				{ id = "http://www.roblox.com/asset/?id=129967390", weight = 10 } 
--				{ id = "slash.xml", weight = 10 } 
			},
	toollunge = {
				{ id = "http://www.roblox.com/asset/?id=129967478", weight = 10 } 
			},
	wave = {
				{ id = "http://www.roblox.com/asset/?id=128777973", weight = 10 } 
			},
	point = {
				{ id = "http://www.roblox.com/asset/?id=128853357", weight = 10 } 
			},
	dance1 = {
				{ id = "http://www.roblox.com/asset/?id=182435998", weight = 10 }, 
				{ id = "http://www.roblox.com/asset/?id=182491037", weight = 10 }, 
				{ id = "http://www.roblox.com/asset/?id=182491065", weight = 10 } 
			},
	dance2 = {
				{ id = "http://www.roblox.com/asset/?id=182436842", weight = 10 }, 
				{ id = "http://www.roblox.com/asset/?id=182491248", weight = 10 }, 
				{ id = "http://www.roblox.com/asset/?id=182491277", weight = 10 } 
			},
	dance3 = {
				{ id = "http://www.roblox.com/asset/?id=182436935", weight = 10 }, 
				{ id = "http://www.roblox.com/asset/?id=182491368", weight = 10 }, 
				{ id = "http://www.roblox.com/asset/?id=182491423", weight = 10 } 
			},
	laugh = {
				{ id = "http://www.roblox.com/asset/?id=129423131", weight = 10 } 
			},
	cheer = {
				{ id = "http://www.roblox.com/asset/?id=129423030", weight = 10 } 
			},
}
local dances = {"dance1", "dance2", "dance3"}

-- Existance in this list signifies that it is an emote, the value indicates if it is a looping emote
local emoteNames = { wave = false, point = false, dance1 = true, dance2 = true, dance3 = true, laugh = false, cheer = false}

function configureAnimationSet(name, fileList)
	if (animTable[name] ~= nil) then
		for _, connection in pairs(animTable[name].connections) do
			connection:disconnect()
		end
	end
	animTable[name] = {}
	animTable[name].count = 0
	animTable[name].totalWeight = 0	
	animTable[name].connections = {}

	-- check for config values
	local config = script:FindFirstChild(name)
	if (config ~= nil) then
--		print("Loading anims " .. name)
		table.insert(animTable[name].connections, config.ChildAdded:connect(function(child) configureAnimationSet(name, fileList) end))
		table.insert(animTable[name].connections, config.ChildRemoved:connect(function(child) configureAnimationSet(name, fileList) end))
		local idx = 1
		for _, childPart in pairs(config:GetChildren()) do
			if (childPart:IsA("Animation")) then
				table.insert(animTable[name].connections, childPart.Changed:connect(function(property) configureAnimationSet(name, fileList) end))
				animTable[name][idx] = {}
				animTable[name][idx].anim = childPart
				local weightObject = childPart:FindFirstChild("Weight")
				if (weightObject == nil) then
					animTable[name][idx].weight = 1
				else
					animTable[name][idx].weight = weightObject.Value
				end
				animTable[name].count = animTable[name].count + 1
				animTable[name].totalWeight = animTable[name].totalWeight + animTable[name][idx].weight
	--			print(name .. " [" .. idx .. "] " .. animTable[name][idx].anim.AnimationId .. " (" .. animTable[name][idx].weight .. ")")
				idx = idx + 1
			end
		end
	end

	-- fallback to defaults
	if (animTable[name].count <= 0) then
		for idx, anim in pairs(fileList) do
			animTable[name][idx] = {}
			animTable[name][idx].anim = Instance.new("Animation")
			animTable[name][idx].anim.Name = name
			animTable[name][idx].anim.AnimationId = anim.id
			animTable[name][idx].weight = anim.weight
			animTable[name].count = animTable[name].count + 1
			animTable[name].totalWeight = animTable[name].totalWeight + anim.weight
--			print(name .. " [" .. idx .. "] " .. anim.id .. " (" .. anim.weight .. ")")
		end
	end
end

-- Setup animation objects
function scriptChildModified(child)
	local fileList = animNames[child.Name]
	if (fileList ~= nil) then
		configureAnimationSet(child.Name, fileList)
	end	
end

script.ChildAdded:connect(scriptChildModified)
script.ChildRemoved:connect(scriptChildModified)

-- Clear any existing animation tracks
-- Fixes issue with characters that are moved in and out of the Workspace accumulating tracks
local animator = if Humanoid then Humanoid:FindFirstChildOfClass("Animator") else nil
if animator then
	local animTracks = animator:GetPlayingAnimationTracks()
	for i,track in ipairs(animTracks) do
		track:Stop(0)
		track:Destroy()
	end
end


for name, fileList in pairs(animNames) do 
	configureAnimationSet(name, fileList)
end	

-- ANIMATION

-- declarations
local toolAnim = "None"
local toolAnimTime = 0

local jumpAnimTime = 0
local jumpAnimDuration = 0.3

local toolTransitionTime = 0.1
local fallTransitionTime = 0.3
local jumpMaxLimbVelocity = 0.75

-- functions

function stopAllAnimations()
	local oldAnim = currentAnim

	-- return to idle if finishing an emote
	if (emoteNames[oldAnim] ~= nil and emoteNames[oldAnim] == false) then
		oldAnim = "idle"
	end

	currentAnim = ""
	currentAnimInstance = nil
	if (currentAnimKeyframeHandler ~= nil) then
		currentAnimKeyframeHandler:disconnect()
	end

	if (currentAnimTrack ~= nil) then
		currentAnimTrack:Stop()
		currentAnimTrack:Destroy()
		currentAnimTrack = nil
	end
	return oldAnim
end

function setAnimationSpeed(speed)
	if speed ~= currentAnimSpeed then
		currentAnimSpeed = speed
		currentAnimTrack:AdjustSpeed(currentAnimSpeed)
	end
end

function keyFrameReachedFunc(frameName)
	if (frameName == "End") then

		local repeatAnim = currentAnim
		-- return to idle if finishing an emote
		if (emoteNames[repeatAnim] ~= nil and emoteNames[repeatAnim] == false) then
			repeatAnim = "idle"
		end
		
		local animSpeed = currentAnimSpeed
		playAnimation(repeatAnim, 0.0, Humanoid)
		setAnimationSpeed(animSpeed)
	end
end

-- Preload animations
function playAnimation(animName, transitionTime, humanoid) 
		
	local roll = math.random(1, animTable[animName].totalWeight) 
	local origRoll = roll
	local idx = 1
	while (roll > animTable[animName][idx].weight) do
		roll = roll - animTable[animName][idx].weight
		idx = idx + 1
	end
--		print(animName .. " " .. idx .. " [" .. origRoll .. "]")
	local anim = animTable[animName][idx].anim

	-- switch animation		
	if (anim ~= currentAnimInstance) then
		
		if (currentAnimTrack ~= nil) then
			currentAnimTrack:Stop(transitionTime)
			currentAnimTrack:Destroy()
		end

		currentAnimSpeed = 1.0
	
		-- load it to the humanoid; get AnimationTrack
		currentAnimTrack = humanoid:LoadAnimation(anim)
		currentAnimTrack.Priority = Enum.AnimationPriority.Core
		 
		-- play the animation
		currentAnimTrack:Play(transitionTime)
		currentAnim = animName
		currentAnimInstance = anim

		-- set up keyframe name triggers
		if (currentAnimKeyframeHandler ~= nil) then
			currentAnimKeyframeHandler:disconnect()
		end
		currentAnimKeyframeHandler = currentAnimTrack.KeyframeReached:connect(keyFrameReachedFunc)
		
	end

end

-------------------------------------------------------------------------------------------
-------------------------------------------------------------------------------------------

local toolAnimName = ""
local toolAnimTrack = nil
local toolAnimInstance = nil
local currentToolAnimKeyframeHandler = nil

function toolKeyFrameReachedFunc(frameName)
	if (frameName == "End") then
--		print("Keyframe : ".. frameName)	
		playToolAnimation(toolAnimName, 0.0, Humanoid)
	end
end


function playToolAnimation(animName, transitionTime, humanoid, priority)	 
		
		local roll = math.random(1, animTable[animName].totalWeight) 
		local origRoll = roll
		local idx = 1
		while (roll > animTable[animName][idx].weight) do
			roll = roll - animTable[animName][idx].weight
			idx = idx + 1
		end
--		print(animName .. " * " .. idx .. " [" .. origRoll .. "]")
		local anim = animTable[animName][idx].anim

		if (toolAnimInstance ~= anim) then
			
			if (toolAnimTrack ~= nil) then
				toolAnimTrack:Stop()
				toolAnimTrack:Destroy()
				transitionTime = 0
			end
					
			-- load it to the humanoid; get AnimationTrack
			toolAnimTrack = humanoid:LoadAnimation(anim)
			if priority then
				toolAnimTrack.Priority = priority
			end
			 
			-- play the animation
			toolAnimTrack:Play(transitionTime)
			toolAnimName = animName
			toolAnimInstance = anim

			currentToolAnimKeyframeHandler = toolAnimTrack.KeyframeReached:connect(toolKeyFrameReachedFunc)
		end
end

function stopToolAnimations()
	local oldAnim = toolAnimName

	if (currentToolAnimKeyframeHandler ~= nil) then
		currentToolAnimKeyframeHandler:disconnect()
	end

	toolAnimName = ""
	toolAnimInstance = nil
	if (toolAnimTrack ~= nil) then
		toolAnimTrack:Stop()
		toolAnimTrack:Destroy()
		toolAnimTrack = nil
	end


	return oldAnim
end

-------------------------------------------------------------------------------------------
-------------------------------------------------------------------------------------------


function onRunning(speed)
	speed /= getRigScale()
	
	if speed > 0.01 then
		playAnimation("walk", 0.1, Humanoid)
		if currentAnimInstance and currentAnimInstance.AnimationId == "http://www.roblox.com/asset/?id=180426354" then
			setAnimationSpeed(speed / 14.5)
		end
		pose = "Running"
	else
		if emoteNames[currentAnim] == nil then
			playAnimation("idle", 0.1, Humanoid)
			pose = "Standing"
		end
	end
end

function onDied()
	pose = "Dead"
end

function onJumping()
	playAnimation("jump", 0.1, Humanoid)
	jumpAnimTime = jumpAnimDuration
	pose = "Jumping"
end

function onClimbing(speed)
	speed /= getRigScale()
	
	playAnimation("climb", 0.1, Humanoid)
	setAnimationSpeed(speed / 12.0)
	pose = "Climbing"
end

function onGettingUp()
	pose = "GettingUp"
end

function onFreeFall()
	if (jumpAnimTime <= 0) then
		playAnimation("fall", fallTransitionTime, Humanoid)
	end
	pose = "FreeFall"
end

function onFallingDown()
	pose = "FallingDown"
end

function onSeated()
	pose = "Seated"
end

function onPlatformStanding()
	pose = "PlatformStanding"
end

function onSwimming(speed)
	if speed > 0 then
		pose = "Running"
	else
		pose = "Standing"
	end
end

function getTool()	
	for _, kid in ipairs(Figure:GetChildren()) do
		if kid.className == "Tool" then return kid end
	end
	return nil
end

function getToolAnim(tool)
	for _, c in ipairs(tool:GetChildren()) do
		if c.Name == "toolanim" and c.className == "StringValue" then
			return c
		end
	end
	return nil
end

function animateTool()
	
	if (toolAnim == "None") then
		playToolAnimation("toolnone", toolTransitionTime, Humanoid, Enum.AnimationPriority.Idle)
		return
	end

	if (toolAnim == "Slash") then
		playToolAnimation("toolslash", 0, Humanoid, Enum.AnimationPriority.Action)
		return
	end

	if (toolAnim == "Lunge") then
		playToolAnimation("toollunge", 0, Humanoid, Enum.AnimationPriority.Action)
		return
	end
end

function moveSit()
	RightShoulder.MaxVelocity = 0.15
	LeftShoulder.MaxVelocity = 0.15
	RightShoulder:SetDesiredAngle(3.14 /2)
	LeftShoulder:SetDesiredAngle(-3.14 /2)
	RightHip:SetDesiredAngle(3.14 /2)
	LeftHip:SetDesiredAngle(-3.14 /2)
end

local lastTick = 0

function move(time)
	local amplitude = 1
	local frequency = 1
  	local deltaTime = time - lastTick
  	lastTick = time

	local climbFudge = 0
	local setAngles = false

  	if (jumpAnimTime > 0) then
  		jumpAnimTime = jumpAnimTime - deltaTime
  	end

	if (pose == "FreeFall" and jumpAnimTime <= 0) then
		playAnimation("fall", fallTransitionTime, Humanoid)
	elseif (pose == "Seated") then
		playAnimation("sit", 0.5, Humanoid)
		return
	elseif (pose == "Running") then
		playAnimation("walk", 0.1, Humanoid)
	elseif (pose == "Dead" or pose == "GettingUp" or pose == "FallingDown" or pose == "Seated" or pose == "PlatformStanding") then
--		print("Wha " .. pose)
		stopAllAnimations()
		amplitude = 0.1
		frequency = 1
		setAngles = true
	end

	if (setAngles) then
		local desiredAngle = amplitude * math.sin(time * frequency)

		RightShoulder:SetDesiredAngle(desiredAngle + climbFudge)
		LeftShoulder:SetDesiredAngle(desiredAngle - climbFudge)
		RightHip:SetDesiredAngle(-desiredAngle)
		LeftHip:SetDesiredAngle(-desiredAngle)
	end

	-- Tool Animation handling
	local tool = getTool()
	if tool and tool:FindFirstChild("Handle") then
	
		local animStringValueObject = getToolAnim(tool)

		if animStringValueObject then
			toolAnim = animStringValueObject.Value
			-- message recieved, delete StringValue
			animStringValueObject.Parent = nil
			toolAnimTime = time + .3
		end

		if time > toolAnimTime then
			toolAnimTime = 0
			toolAnim = "None"
		end

		animateTool()		
	else
		stopToolAnimations()
		toolAnim = "None"
		toolAnimInstance = nil
		toolAnimTime = 0
	end
end

-- connect events
Humanoid.Died:connect(onDied)
Humanoid.Running:connect(onRunning)
Humanoid.Jumping:connect(onJumping)
Humanoid.Climbing:connect(onClimbing)
Humanoid.GettingUp:connect(onGettingUp)
Humanoid.FreeFalling:connect(onFreeFall)
Humanoid.FallingDown:connect(onFallingDown)
Humanoid.Seated:connect(onSeated)
Humanoid.PlatformStanding:connect(onPlatformStanding)
Humanoid.Swimming:connect(onSwimming)

---- setup emote chat hook
game:GetService("Players").LocalPlayer.Chatted:connect(function(msg)
	local emote = ""
	if msg == "/e dance" then
		emote = dances[math.random(1, #dances)]
	elseif (string.sub(msg, 1, 3) == "/e ") then
		emote = string.sub(msg, 4)
	elseif (string.sub(msg, 1, 7) == "/emote ") then
		emote = string.sub(msg, 8)
	end
	
	if (pose == "Standing" and emoteNames[emote] ~= nil) then
		playAnimation(emote, 0.1, Humanoid)
	end

end)

-- emote bindable hook
script:WaitForChild("PlayEmote").OnInvoke = function(emote)
	-- Only play emotes when idling
	if pose ~= "Standing" then
		return
	end
	if emoteNames[emote] ~= nil then
		-- Default emotes
		playAnimation(emote, EMOTE_TRANSITION_TIME, Humanoid)

		return true, currentAnimTrack
	end

	-- Return false to indicate that the emote could not be played
	return false
end
-- main program

-- initialize to idle
playAnimation("idle", 0.1, Humanoid)
pose = "Standing"

while Figure.Parent ~= nil do
	local _, time = wait(0.1)
	move(time)
end

[DeleteDMoonz (myz2die)]

Thanks, but im talking about the movement system, not animations. Disabling “animate” will disable anims, but I can still move using WASD and Space.