How to make my sprint mechanic work?

[desert garnet]

local plr = game.Players.LocalPlayer
local UserInputService = game:GetService("UserInputService")

local walkSpeed = 10
local sprintSpeed = 32
local speedBuildTime = 0.5 -- seconds to reach full sprint speed
local humanoid = nil
local sprinting = false

-- Find AnimationController and Animation objects under this script
local animController = script:FindFirstChild("SprintAnimController")
local speedBurstAnimObj = nil
local sprintAnimObj = nil

if animController then
speedBurstAnimObj = animController:FindFirstChild("SpeedBurst")
sprintAnimObj = animController:FindFirstChild("Sprint")
end

local speedBurstTrack = nil
local sprintTrack = nil

local function stopAndDestroy(track)
if track then
track:Stop()
track:Destroy()
end
end

local function updateHumanoid()
if plr.Character then
humanoid = plr.Character:FindFirstChild("Humanoid")
if humanoid then
humanoid.WalkSpeed = walkSpeed
-- Clean up previous tracks
stopAndDestroy(speedBurstTrack)
stopAndDestroy(sprintTrack)
speedBurstTrack = nil
sprintTrack = nil
-- Load animations if available
if speedBurstAnimObj then
speedBurstTrack = humanoid:LoadAnimation(speedBurstAnimObj)
end
if sprintAnimObj then
sprintTrack = humanoid:LoadAnimation(sprintAnimObj)
end
end
end
end

[desert garnet]

plr.CharacterAdded:Connect(function()
updateHumanoid()
end)

updateHumanoid()

local function buildUpSprint()
if not humanoid then return end
local startSpeed = humanoid.WalkSpeed
local targetSpeed = sprintSpeed
local elapsed = 0
sprinting = true
-- Play speed burst animation
if speedBurstTrack then
speedBurstTrack:Play()
speedBurstTrack.Looped = false
end
while sprinting and humanoid and humanoid.WalkSpeed < targetSpeed do
elapsed = elapsed + task.wait()
local alpha = math.clamp(elapsed / speedBuildTime, 0, 1)
humanoid.WalkSpeed = startSpeed + (targetSpeed - startSpeed) * alpha
if alpha >= 1 then
humanoid.WalkSpeed = targetSpeed
break
end
end
-- Stop speed burst animation and play sprint animation
if speedBurstTrack then
speedBurstTrack:Stop()
end
if sprintTrack then
sprintTrack:Play()
sprintTrack.Looped = true
end
end

local function buildDownSprint()
if not humanoid then return end
local startSpeed = humanoid.WalkSpeed
local targetSpeed = walkSpeed
local elapsed = 0
local downTime = speedBuildTime
-- Stop both animations
if sprintTrack then
sprintTrack:Stop()
end
if speedBurstTrack then
speedBurstTrack:Stop()
end
while not sprinting and humanoid and humanoid.WalkSpeed > targetSpeed do
elapsed = elapsed + task.wait()
local alpha = math.clamp(elapsed / downTime, 0, 1)
humanoid.WalkSpeed = startSpeed + (targetSpeed - startSpeed) * alpha
if alpha >= 1 then
humanoid.WalkSpeed = targetSpeed
break
end
end
end

UserInputService.InputBegan:Connect(function(input, gameProcessed)
if gameProcessed then return end
if input.KeyCode == Enum.KeyCode.LeftShift then
if humanoid and not sprinting then
task.spawn(buildUpSprint)
end
end
end)

UserInputService.InputEnded:Connect(function(input, gameProcessed)
if input.KeyCode == Enum.KeyCode.LeftShift then
if sprinting then
sprinting = false
task.spawn(buildDownSprint)
end
end
end)

idk if this is a good explanation. I have this script in a seperate folder in the StarterPlayerScripts

[vivid trail]

whats happening instead of it sprinting

[full urchin]

** You are now Level 1! **

[desert garnet]

The actual sprinting is working but the animations wont play

[vivid trail]

r6 or r15

[desert garnet]

R6

[vivid trail]

you set the animation prioritys right?

[desert garnet]

Also i have another weird bug now. So I added console controls for sprinting and now when ever you just hold w it does the sprint and to slow down you just tap shift. Which is weird.

[full urchin]

** You are now Level 2! **

[desert garnet]

Uh, im not sure. I dont think so. Im quite new to studio 💔

[vivid trail]

so uh

are you in studio rn

[desert garnet]

No not currently. I just got off because its getting late. But if you tell me what to do I will do it tomorrow

[vivid trail]

it doesnt look like you set the speedbursttrack to anything

is that the full code?

[desert garnet]

Yeah i sent everything

[vivid trail]

you have the animaiton id of all animaitons right?

[desert garnet]

Yep

[vivid trail]

i dont see any ids in this code here

[desert garnet]

I had the animations parented to the script and just referenced them

Does that not work

[desert garnet]

Idk if im explaining that right.

[vivid trail]

this is all parented to humanoid right?

[desert garnet]

Uh. I think so

Lemme js turn back on my computer rq. I'll js fix it rn.

[vivid trail]

wont starterplayerscripts just put the scripts under the player, not the humanoid?

[desert garnet]

OHHHHH

YOUR RIGHT

[vivid trail]

so like

maybe do smth like this

local sprintAnim = Instance.new("Animation")
sprintAnim.AnimationId = "rbxassetid://IDK CODE THINGY"
local sprintTrack = humanoid:LoadAnimation(sprintAnim)

then just use sprintTrack:Play()

and sprintTrack:Stop()

or smth

[desert garnet]

Where would I replace this?

[vivid trail]

i guess you can just remove the animaton objects and the refrences to them then just add it at the top

[full urchin]

** You are now Level 2! **

[vivid trail]

wait you set the animations to looping right?

[desert garnet]

The sprint one yes. The speed build up, no.

[vivid trail]

k

think that should work

[desert garnet]

Alright let me see

This is gonna take a minute. My pc has to update for some reason

[vivid trail]

classic windows

[desert garnet]

Yes 😭

[vivid trail]

lol

i sure love the activate windows watermark

[desert garnet]

Im doing all of this and idek if ima keep sprinting 💔

[vivid trail]

hm

[desert garnet]

Yeah idk

[full urchin]

** You are now Level 3! **

[vivid trail]

did u put that hing into studio

[desert garnet]

Yep

And it didnt work

Im lowkey js rewriting it all bc I think I overcomplicated it.

[vivid trail]

hmm

local camera = game.Workspace.CurrentCamera
local TweenService = game:GetService("TweenService")
local UIS = game:GetService("UserInputService")
local Player = game.Players.LocalPlayer

local SprintAnim = Instance.new("Animation")
SprintAnim.AnimationId = "rbxassetid://85916295470262"

local WalkAnim = Instance.new("Animation")
WalkAnim.AnimationId = "rbxassetid://100498936469692"

local normalFOV = 70
local sprintFOV = 80
local tweenTime = 0.3
local isSprinting = false
local SprintTrack
local WalkTrack
local Humanoid

local function tweenFOV(targetFOV)
local tweenInfo = TweenInfo.new(tweenTime, Enum.EasingStyle.Quad, Enum.EasingDirection.InOut)
local fovTween = TweenService:Create(camera, tweenInfo, {FieldOfView = targetFOV})
fovTween:Play()
end

UIS.InputBegan:Connect(function(input, processed)
if input.UserInputType == Enum.UserInputType.Keyboard and not processed then
if input.KeyCode == Enum.KeyCode.LeftShift and not isSprinting and Humanoid then
isSprinting = true
Humanoid.WalkSpeed = 24
tweenFOV(sprintFOV)

        if WalkTrack and WalkTrack.IsPlaying then WalkTrack:Stop() end
        if SprintTrack then SprintTrack:Play() end
    end
end

end)

UIS.InputEnded:Connect(function(input, processed)
if input.UserInputType == Enum.UserInputType.Keyboard and input.KeyCode == Enum.KeyCode.LeftShift and isSprinting and Humanoid then
isSprinting = false
Humanoid.WalkSpeed = 16
tweenFOV(normalFOV)

    if SprintTrack then SprintTrack:Stop() end
end

end)

local function onCharacterAdded(character)
Humanoid = character:WaitForChild("Humanoid")

SprintTrack = Humanoid:LoadAnimation(SprintAnim)
WalkTrack = Humanoid:LoadAnimation(WalkAnim)

Humanoid.WalkSpeed = 16

Humanoid.Running:Connect(function(speed)
    if speed > 0.1 then
        if isSprinting then
            if SprintTrack and not SprintTrack.IsPlaying then SprintTrack:Play() end
            if WalkTrack and WalkTrack.IsPlaying then WalkTrack:Stop() end
        else
            if WalkTrack and not WalkTrack.IsPlaying then WalkTrack:Play() end
            if SprintTrack and SprintTrack.IsPlaying then SprintTrack:Stop() end
        end
    else
        if WalkTrack and WalkTrack.IsPlaying then WalkTrack:Stop() end
        if SprintTrack and SprintTrack.IsPlaying then SprintTrack:Stop() end
    end
end)

end

if Player.Character then
onCharacterAdded(Player.Character)
end
Player.CharacterAdded:Connect(onCharacterAdded)

i got this script

theres no speedburst thing tho

[vivid trail]

maybe u can base it off of this

[desert garnet]

Im scrapping that anyway

[vivid trail]

k

[desert garnet]

Where would I put this?

[vivid trail]

starterplayerscripts as a localscript

you need to put in ur own animations tho cuz roblox doesnt like sharing aniamtions

[desert garnet]

ok

thank you

[vivid trail]

k

[desert garnet]

I put my own animation id but it didnt work. Is there something else I need to do?

[vivid trail]

whats the animation prority

[desert garnet]

Oh yeah i forgot to change that

What does it need to be

[vivid trail]

uh

hmm

what is it set to rn

[desert garnet]

Movement

[vivid trail]

hmm

core works for me for some reason

[vivid trail]

core seems to work

[desert garnet]

Nah it aint working

[vivid trail]

hmm

im playing it rn it works perfectly

is it just going into shiftlock?

[vivid trail]

do u have shiftlock switch on

[desert garnet]

No

Maybe my shitty pc just aint loading it. Thats probably the problem 💔

[vivid trail]

this is in starterplayer right

[desert garnet]

Yes

[vivid trail]

also did u change anything other than the id's

[desert garnet]

Nope

[vivid trail]

ok no idk whats happeneing

is it faster tho

[desert garnet]

I only changed the sprint id. Is that the problem?

[vivid trail]

try changing the walk animation too

[desert garnet]

Didn't work

Do I need an to add an animation in the localscript?

[vivid trail]

is there any errors in the script

like red lines

[vivid trail]

no

u just need the id's

[desert garnet]

No. There is no errors

[vivid trail]

brueh

its working perfectly for me

[desert garnet]

Do you want me to dm you the game file?

[vivid trail]

nah

uh

hmm

the only error thats happening is that the animations arent playing right?

[vivid trail]

did you make the animations?

[desert garnet]

Yep

[vivid trail]

can you try just playing them

like have a script that just loads the animation then starts playing it

[desert garnet]

Like on a rig?

[vivid trail]

yeah sure try a rig

that will just load and play it

[desert garnet]

Ok hold on

[desert garnet]

I mightve just Scripted it wrong but the animation wont play on the rig either

[full urchin]

** You are now Level 4! **

[vivid trail]

er

how did u script it

[desert garnet]

I put this in the humanoid of the rig:

local sprintAnim = Instance.new("Animation")
sprintAnim.AnimationId = "123382623519254"
local sprintTrack = script.Parent:LoadAnimation(sprintAnim)

sprintTrack:Play()
print("success")

[vivid trail]

when stating an animation id

it needs to start with

"rbxassetid://"

so dont put "123382623519254"

[desert garnet]

Oh yeah

[vivid trail]

"rbxassetid://123382623519254"

like that

k does that work now?

[desert garnet]

Uh

Still no

[vivid trail]

ok uh

[full urchin]

** You are now Level 4! **

[vivid trail]

what is script.parent

what is it parented too

[desert garnet]

The Humanoid of the rig

[vivid trail]

try using an animation object

[desert garnet]

?

[vivid trail]

uh

this thing

[desert garnet]

Ok.

Uh

I'll try that tomorrow. I must sleep. It late.