Can’t figure this one out.
Why does it randomly cancel my jump?
To replicate:
In StarterPlayer set DevComputerMovementMode to Scriptable
Script in StarterPlayerScripts
-- Services --
local RunService = game:GetService("RunService")
local UserInputService = game:GetService("UserInputService")
local Players = game:GetService("Players")
-- Variables --
local LocalPlayer = Players.LocalPlayer
local Character = LocalPlayer.Character or LocalPlayer.CharacterAdded:Wait()
local Humanoid = Character:WaitForChild("Humanoid")
local HumanoidRootPart = Character:WaitForChild("HumanoidRootPart")
local KeyStates = {
W = false;
A = false;
S = false;
D = false;
}
local velocity = Vector3.new(0, 0, 0)
local vertVelocity = 0
local acceleration = 80
local deacceleration = 16
local groundVelocityCap = 16
local jumpHeight = 100
local gravity = -1
local isSliding = false
local isJumping = false
local moveDirection = Vector3.new(0, 0, 0)
local lastMoveDirection = Vector3.new(0, 0, 0)
local lastHumanoidRootPartLookVector
-- Input Handler --
UserInputService.InputBegan:Connect(function(input, _gameProcessed)
if _gameProcessed then return end
if input.KeyCode == Enum.KeyCode.W then
KeyStates.W = true
elseif input.KeyCode == Enum.KeyCode.A then
KeyStates.A = true
elseif input.KeyCode == Enum.KeyCode.S then
KeyStates.S = true
elseif input.KeyCode == Enum.KeyCode.D then
KeyStates.D = true
elseif input.KeyCode == Enum.KeyCode.LeftShift then
isSliding = true
elseif input.KeyCode == Enum.KeyCode.Space then
if not isJumping and Humanoid.FloorMaterial ~= Enum.Material.Air then
isJumping = true
vertVelocity = jumpHeight
end
end
end)
UserInputService.InputEnded:Connect(function(input, _gameProcessed)
if _gameProcessed then return end
if input.KeyCode == Enum.KeyCode.W then
KeyStates.W = false
elseif input.KeyCode == Enum.KeyCode.A then
KeyStates.A = false
elseif input.KeyCode == Enum.KeyCode.S then
KeyStates.S = false
elseif input.KeyCode == Enum.KeyCode.D then
KeyStates.D = false
elseif input.KeyCode == Enum.KeyCode.LeftShift then
isSliding = false
elseif input.KeyCode == Enum.KeyCode.Space then
isJumping = false
end
end)
-- RunService Loop --
RunService.Stepped:Connect(function(_currentTime, deltaTime)
-- Wish direction
local wishDir = Vector3.new(
(KeyStates.D and 1 or 0) - (KeyStates.A and 1 or 0),
0,
(KeyStates.S and 1 or 0) - (KeyStates.W and 1 or 0)
)
if wishDir.Magnitude == 0 then
wishDir = Vector3.new(0, 0, 0)
end
-- Acceleration and velocity cap on ground
if wishDir.Magnitude > 0 and not isSliding then
velocity = velocity + (wishDir * acceleration * deltaTime)
if velocity.Magnitude > groundVelocityCap and Humanoid.FloorMaterial ~= Enum.Material.Air then
velocity = velocity.Unit * groundVelocityCap
end
end
-- Ground deacceleration
if Humanoid.FloorMaterial ~= Enum.Material.Air and not isSliding and wishDir == Vector3.new(0, 0, 0) then
if velocity.Magnitude < 0.1 then velocity = Vector3.new(0, 0, 0) end
velocity = velocity * (1 - deacceleration * deltaTime)
end
if Humanoid.FloorMaterial ~= Enum.Material.Air then
if isJumping then
vertVelocity = jumpHeight
isJumping = false
else
vertVelocity = 0
end
else
vertVelocity = vertVelocity + (gravity * deltaTime)
end
-- Move Character and lock orientation when sliding
if not isSliding then
moveDirection = Vector3.new(velocity.X, vertVelocity, velocity.Z)
lastMoveDirection = moveDirection
lastHumanoidRootPartLookVector = HumanoidRootPart.CFrame.LookVector
else
moveDirection = Vector3.new(lastMoveDirection.X, vertVelocity, lastMoveDirection.Z)
HumanoidRootPart.CFrame = CFrame.new(HumanoidRootPart.CFrame.Position, HumanoidRootPart.CFrame.Position + lastHumanoidRootPartLookVector)
task.delay(.5, function()
isSliding = false
end)
end
HumanoidRootPart.CFrame = HumanoidRootPart.CFrame * CFrame.new(moveDirection * deltaTime)
LocalPlayer.PlayerGui.ScreenGui.Frame.TextLabel.Text = tostring(velocity.Magnitude)
end)
I can’t say this is for sure, but it may be the timing… that the RunService function you have may be actually too early or late. Because I think that .Stepped is ran before the physics simulation. Meaning it may cause the function to run too early, affecting the next jump instead, and using the wrong values at the wrong time. I had an issue with something like this when I did a jump fatigue script quite a bit ago.
Try changing .Stepped to .PreSimulation, if that doesn’t work then it could be because it’s too early, so maybe try .RenderStepped
Task scheduler diagram, may be useful (From roblox docs)
If this timing isn’t it, I would try changing/messing around with your ground deceleration/Acceleration and cap code, because that could also be causing it. (btw you made a typo in your comment and in your code, should be deceleration, srry.)
This part of your code: (No edits made, just pointing out another area of focus
-- Acceleration and velocity cap on ground
if wishDir.Magnitude > 0 and not isSliding then
velocity = velocity + (wishDir * acceleration * deltaTime)
if velocity.Magnitude > groundVelocityCap and Humanoid.FloorMaterial ~= Enum.Material.Air then
velocity = velocity.Unit * groundVelocityCap
end
end
-- Ground deacceleration
if Humanoid.FloorMaterial ~= Enum.Material.Air and not isSliding and wishDir == Vector3.new(0, 0, 0) then
if velocity.Magnitude < 0.1 then velocity = Vector3.new(0, 0, 0) end
velocity = velocity * (1 - deacceleration * deltaTime)
end
if Humanoid.FloorMaterial ~= Enum.Material.Air then
if isJumping then
vertVelocity = jumpHeight
isJumping = false
else
vertVelocity = 0
end
else
vertVelocity = vertVelocity + (gravity * deltaTime)
end
I’ve tried RunService.Heartbeat, RunService.Stepped, RunService.PreSimulation, RunService.PostSimulation
Nothing seems to fix the problem, some just make it more intense
Okay, well I’m kind of unsure of your real end goal and of what your trying to do with the ground deceleration, and acceleration code, and I’m probably not that much of a help when it comes to that, so if you can’t find anyone else who knows, maybe give ChatGPT a try, since I’m sure it’ll be able to help you better than I can, since my physics and mathematical tolerance is pretty low lel.
You’d be surprised. It’s literally a GPU made for mathematically calculations, if anything/one can fix any math or physics issue you have with your code it’s going to be that GPU.
if Humanoid.FloorMaterial ~= Enum.Material.Air then
if not isJumping then
vertVelocity = 0
end
else
vertVelocity = vertVelocity + (gravity * deltaTime)
end
