Help on finding something in the Jeep Script

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#1

Hello, I am trying to create my own vehicle using the Roblox jeep. I am struggling to find which part causes the vehicle to stop the moment you stop pressing W or S. I am trying to understand how raycasting suspension works and how to get the jeep to decelerate, I have figured out various ways to accelerate but whatever I do for decelerating never works.
The script can be found in the default jeep script and I’m assuming what I’m searching for is on line 54 of the script below: (local script from jeep in city template)
I apologise if this a duplicated thread.

local player = game.Players.LocalPlayer
local character = player.Character
local humanoidRootPart = character.HumanoidRootPart
local car = script:WaitForChild("Car").Value
local stats = car:WaitForChild("Configurations")
local Raycast = require(car.CarScript.RaycastModule)

local movement = Vector2.new()
local gamepadDeadzone = 0.14

car.DriveSeat.Changed:connect(function(property)
	if property == "Steer" then
		movement = Vector2.new(car.DriveSeat.Steer, movement.Y)
	elseif property == "Throttle" then
		movement = Vector2.new(movement.X, car.DriveSeat.Throttle)
	end
end)
local force = 0
local damping = 0

local mass = 0

for i, v in pairs(car:GetChildren()) do
	if v:IsA("BasePart") then
		mass = mass + (v:GetMass() * 196.2)
	end
end

force = mass * stats.Suspension.Value
damping = force / stats.Bounce.Value

local bodyVelocity = Instance.new("BodyVelocity", car.Chassis)
bodyVelocity.velocity = Vector3.new(0, 0, 0)
bodyVelocity.maxForce = Vector3.new(0, 0, 0)

local bodyAngularVelocity = Instance.new("BodyAngularVelocity", car.Chassis)
bodyAngularVelocity.angularvelocity = Vector3.new(0, 0, 0)
bodyAngularVelocity.maxTorque = Vector3.new(0, 0, 0)

local rotation = 0

local function UpdateThruster(thruster)
	local bodyThrust = thruster:FindFirstChild("BodyThrust")
	if not bodyThrust then
		bodyThrust = Instance.new("BodyThrust", thruster)
	end
	local hit, position = Raycast.new(thruster.Position, thruster.CFrame:vectorToWorldSpace(Vector3.new(0, -1, 0)) * stats.Height.Value)
	local thrusterHeight = (position - thruster.Position).magnitude
	if hit and hit.CanCollide then
		bodyThrust.force = Vector3.new(0, ((stats.Height.Value - thrusterHeight)^2) * (force / stats.Height.Value^2), 0)
		local thrusterDamping = thruster.CFrame:toObjectSpace(CFrame.new(thruster.Velocity + thruster.Position)).p * damping
		bodyThrust.force = bodyThrust.force - Vector3.new(0, thrusterDamping.Y, 0)
	else
		bodyThrust.force = Vector3.new(0, 0, 0)
	end
	
	--Wheels
	local wheelWeld = thruster:FindFirstChild("WheelWeld")
	if wheelWeld then
		wheelWeld.C0 = CFrame.new(0, -math.min(thrusterHeight, stats.Height.Value * 0.8) + (wheelWeld.Part1.Size.Y / 2), 0)
		-- Wheel turning
		local offset = car.Chassis.CFrame:inverse() * thruster.CFrame
		local speed = car.Chassis.CFrame:vectorToObjectSpace(car.Chassis.Velocity)
		if offset.Z < 0 then
			local direction = 1
			if speed.Z > 0 then
				direction = -1
			end
			wheelWeld.C0 = wheelWeld.C0 * CFrame.Angles(0, (car.Chassis.RotVelocity.Y / 2) * direction, 0)
		end
		wheelWeld.C0 = wheelWeld.C0 * CFrame.Angles(rotation, 0, 0)
	end
end

local function IsGrounded()
	local hit, position = Raycast.new((car.Chassis.CFrame * CFrame.new(0, 0, (car.Chassis.Size.Z / 2) - 1)).p, car.Chassis.CFrame:vectorToWorldSpace(Vector3.new(0, -1, 0)) * (stats.Height.Value + 0.2))
	if hit and hit.CanCollide then
		return(true)
	end
	return(false)
end

while game:GetService("RunService").Heartbeat:wait() and car:FindFirstChild("DriveSeat") and character.Humanoid.SeatPart == car.DriveSeat do
	if IsGrounded() then
		if movement.Y ~= 0 then
			local velocity = humanoidRootPart.CFrame.lookVector * movement.Y * stats.Speed.Value
			humanoidRootPart.Velocity = humanoidRootPart.Velocity:Lerp(velocity, 0.1)
			bodyVelocity.maxForce = Vector3.new(0, 0, 0)
		else
			bodyVelocity.maxForce = Vector3.new(mass / 2, mass / 4, mass / 2)
		end
		local rotVelocity = humanoidRootPart.CFrame:vectorToWorldSpace(Vector3.new(movement.Y * stats.Speed.Value / 50, 0, -humanoidRootPart.RotVelocity.Y * 5 * movement.Y))
		local speed = -humanoidRootPart.CFrame:vectorToObjectSpace(humanoidRootPart.Velocity).unit.Z
		rotation = rotation + math.rad((-stats.Speed.Value / 5) * movement.Y)
		if math.abs(speed) > 0.1 then
			rotVelocity = rotVelocity + humanoidRootPart.CFrame:vectorToWorldSpace((Vector3.new(0, -movement.X * speed * stats.TurnSpeed.Value, 0)))
			bodyAngularVelocity.maxTorque = Vector3.new(0, 0, 0)
		else
			bodyAngularVelocity.maxTorque = Vector3.new(mass / 4, mass / 2, mass / 4)
		end
		humanoidRootPart.RotVelocity = humanoidRootPart.RotVelocity:Lerp(rotVelocity, 0.1)
	else
		bodyVelocity.maxForce = Vector3.new(0, 0, 0)
		bodyAngularVelocity.maxTorque = Vector3.new(0, 0, 0)
	end
	
	for i, part in pairs(car:GetChildren()) do
		if part.Name == "Thruster" then
			UpdateThruster(part)
		end
	end
end
for i, v in pairs(car:GetChildren()) do
	if v:FindFirstChild("BodyThrust") then
		v.BodyThrust:Destroy()
	end
end
bodyVelocity:Destroy()
bodyAngularVelocity:Destroy()
script:Destroy()

EDIT: Solved by forcing the car to always follow the speed value which is controlled by pressing W or S

2 Likes
#2 
movement = Vector2.new(movement.X, car.DriveSeat.Throttle)

Maybe it just has to do with the DriveSeat throttle property? Drive seats have their own system for controlling cars and it seems this script is mostly just customizing it

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#3

Thank you! I will look into this. I haven’t even thought about the driver’s seat throttles/steering, thanks.

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#4

I actually am using this car too for my game and customizing it. I have a touch control gui I made for mobile if you want it

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#5

Oh, I’d love that, thank you :grinning:

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#6

One thing, is that the WHOLE local script and did you edit it at all?

#7

Here’s more notes on how the Jeep functions on how it accelerates when pressing W:

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#8

I’ve only removed the large batches of comments and fixed the messed up orientation and I believe it is the whole local script.

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#9

Oh thank you, somehow I did not see this when I tried searching all over before making this thread

#10

When I first made my custom gui, the car moved fine with WASD or the arrow keys but with my touch gui it was a little weird. I fixed it but I’m not sure how I fixed it

#11

Ah, okay. I can try and look at it if you’re willing to send it

#12

hey - Roblox gui and script to enable it. will send the rest of the info soon

#13

Here’s my local script

--local camera = game.Workspace.CurrentCamera
local player = game.Players.LocalPlayer
local character = player.Character
local humanoidRootPart = character.HumanoidRootPart
local car = script:WaitForChild("Car").Value
local stats = car:WaitForChild("Configurations")
local Raycast = require(car.CarScript.RaycastModule)
local TouchControl = player.PlayerGui.VehicleTouchControl.Frame -- Make sure you put your gui like this and name it the same

--local cameraType = Enum.CameraType.Follow

local movement = Vector2.new()
local gamepadDeadzone = 0.14

car.DriveSeat.Changed:connect(function(property)
	if property == "Steer" then
		movement = Vector2.new(car.DriveSeat.Steer, movement.Y)
	elseif property == "Throttle" then
		movement = Vector2.new(movement.X, car.DriveSeat.Throttle)
	end
end)

-- Input begin
game:GetService("UserInputService").InputBegan:connect(function(inputObject, gameProcessedEvent)
	if not gameProcessedEvent then
		if inputObject.KeyCode == Enum.KeyCode.W then
			movement = Vector2.new(movement.X, 1)
		elseif inputObject.KeyCode == Enum.KeyCode.A then
			movement = Vector2.new(-1, movement.Y)
		elseif inputObject.KeyCode == Enum.KeyCode.S then
			movement = Vector2.new(movement.X, -1)
		elseif inputObject.KeyCode == Enum.KeyCode.D then
			movement = Vector2.new(1, movement.Y)
		end
	end
end)

-- Touch Input begin

TouchControl.Forward.Button.MouseButton1Down:connect(function(inputObject, gameProcessedEvent)
	movement = Vector2.new(movement.X, 1)
end)
TouchControl.Left.Button.MouseButton1Down:connect(function(inputObject, gameProcessedEvent)
	movement = Vector2.new(-1, movement.Y)
end)
TouchControl.Backward.Button.MouseButton1Down:connect(function(inputObject, gameProcessedEvent)
	movement = Vector2.new(movement.X, -1)
end)
TouchControl.Right.Button.MouseButton1Down:connect(function(inputObject, gameProcessedEvent)
	movement = Vector2.new(1, movement.Y)
end)

game:GetService("UserInputService").InputChanged:connect(function(inputObject, gameProcessedEvent)
	if not gameProcessedEvent then
		if inputObject.KeyCode == Enum.KeyCode.Thumbstick1 then
			--Gamepad support because yay
			if inputObject.Position.magnitude >= gamepadDeadzone then
				movement = Vector2.new(movement.X, inputObject.Position.Y)
			else
				movement = Vector2.new(movement.X, 0)
			end
		elseif inputObject.KeyCode == Enum.KeyCode.Thumbstick2 then
			if inputObject.Position.magnitude >= gamepadDeadzone then
				movement = Vector2.new(inputObject.Position.X, movement.Y)
			else
				movement = Vector2.new(0, movement.Y)
			end
		end
	end
end)

-- Input end
game:GetService("UserInputService").InputEnded:connect(function(inputObject, gameProcessedEvent)
	if inputObject.KeyCode == Enum.KeyCode.W then
		if movement.Y == 1 then
			movement = Vector2.new(movement.X, 0)
		end
	elseif inputObject.KeyCode == Enum.KeyCode.A then
		if movement.X == -1 then
			movement = Vector2.new(0, movement.Y)
		end
	elseif inputObject.KeyCode == Enum.KeyCode.S then
		if movement.Y == -1 then
			movement = Vector2.new(movement.X, 0)
		end
	elseif inputObject.KeyCode == Enum.KeyCode.D then
		if movement.X == 1 then
			movement = Vector2.new(0, movement.Y)
		end
	end
end)

-- Touch Input end

TouchControl.Forward.Button.MouseButton1Up:connect(function(inputObject, gameProcessedEvent)
	if movement.Y == 1 then
		movement = Vector2.new(movement.X, 0)
	end
end)
TouchControl.Left.Button.MouseButton1Up:connect(function(inputObject, gameProcessedEvent)
	if movement.X == -1 then
		movement = Vector2.new(0, movement.Y)
	end
end)
TouchControl.Backward.Button.MouseButton1Up:connect(function(inputObject, gameProcessedEvent)
	if movement.Y == -1 then
		movement = Vector2.new(movement.X, 0)
	end
end)
TouchControl.Right.Button.MouseButton1Up:connect(function(inputObject, gameProcessedEvent)
	if movement.X == 1 then
		movement = Vector2.new(0, movement.Y)
	end
end)

local force = 0
local damping = 0

local mass = 0

for i, v in pairs(car:GetChildren()) do
	if v:IsA("BasePart") then
		mass = mass + (v:GetMass() * 196.2)
	end
end

force = mass * stats.Suspension.Value
damping = force / stats.Bounce.Value

local bodyVelocity = Instance.new("BodyVelocity", car.Chassis)
bodyVelocity.velocity = Vector3.new(0, 0, 0)
bodyVelocity.maxForce = Vector3.new(0, 0, 0)

local bodyAngularVelocity = Instance.new("BodyAngularVelocity", car.Chassis)
bodyAngularVelocity.angularvelocity = Vector3.new(0, 0, 0)
bodyAngularVelocity.maxTorque = Vector3.new(0, 0, 0)

local rotation = 0

local function UpdateThruster(thruster)
	--Make sure we have a bodythrust to move the wheel
	local bodyThrust = thruster:FindFirstChild("BodyThrust")
	if not bodyThrust then
		bodyThrust = Instance.new("BodyThrust", thruster)
	end
	--Do some raycasting to get the height of the wheel
	local hit, position = Raycast.new(thruster.Position, thruster.CFrame:vectorToWorldSpace(Vector3.new(0, -1, 0)) * stats.Height.Value)
	local thrusterHeight = (position - thruster.Position).magnitude
	if hit and hit.CanCollide then
		--If we're on the ground, apply some forces to push the wheel up
		bodyThrust.force = Vector3.new(0, ((stats.Height.Value - thrusterHeight)^2) * (force / stats.Height.Value^2), 0)
		local thrusterDamping = thruster.CFrame:toObjectSpace(CFrame.new(thruster.Velocity + thruster.Position)).p * damping
		bodyThrust.force = bodyThrust.force - Vector3.new(0, thrusterDamping.Y, 0)
	else
		bodyThrust.force = Vector3.new(0, 0, 0)
	end

	--Wheels
	local wheelWeld = thruster:FindFirstChild("WheelWeld")
	if wheelWeld then
		wheelWeld.C0 = CFrame.new(0, -math.min(thrusterHeight, stats.Height.Value * 0.8) + (wheelWeld.Part1.Size.Y / 2), 0)
		-- Wheel turning
		local offset = car.Chassis.CFrame:inverse() * thruster.CFrame
		local speed = car.Chassis.CFrame:vectorToObjectSpace(car.Chassis.Velocity)
		if offset.Z < 0 then
			local direction = 1
			if speed.Z > 0 then
				direction = -1
			end
			wheelWeld.C0 = wheelWeld.C0 * CFrame.Angles(0, (car.Chassis.RotVelocity.Y / 2) * direction, 0)
		end
		wheelWeld.C0 = wheelWeld.C0 * CFrame.Angles(rotation, 0, 0)
	end
end

--A simple function to check if the car is grounded
local function IsGrounded()
	local hit, position = Raycast.new((car.Chassis.CFrame * CFrame.new(0, 0, (car.Chassis.Size.Z / 2) - 1)).p, car.Chassis.CFrame:vectorToWorldSpace(Vector3.new(0, -1, 0)) * (stats.Height.Value + 0.2))
	if hit and hit.CanCollide then
		return(true)
	end
	return(false)
end

--local oldCameraType = camera.CameraType
--camera.CameraType = cameraType

--spawn(function() -- not sure why whoever made this made this a note and not part of the script but when i make it normal and no longer a note i think it breaks it 
while game:GetService("RunService").Heartbeat:wait() and car:FindFirstChild("DriveSeat") and character.Humanoid.SeatPart == car.DriveSeat do
	--game:GetService("RunService").RenderStepped:wait()
	if IsGrounded() then
		if movement.Y ~= 0 then
			local velocity = humanoidRootPart.CFrame.lookVector * movement.Y * stats.Speed.Value
			humanoidRootPart.Velocity = humanoidRootPart.Velocity:Lerp(velocity, 0.1)
			bodyVelocity.maxForce = Vector3.new(0, 0, 0)
		else
			bodyVelocity.maxForce = Vector3.new(mass / 2, mass / 4, mass / 2)
		end
		local rotVelocity = humanoidRootPart.CFrame:vectorToWorldSpace(Vector3.new(movement.Y * stats.Speed.Value / 50, 0, -humanoidRootPart.RotVelocity.Y * 5 * movement.Y))
		local speed = -humanoidRootPart.CFrame:vectorToObjectSpace(humanoidRootPart.Velocity).unit.Z
		rotation = rotation + math.rad((-stats.Speed.Value / 5) * movement.Y)
		if math.abs(speed) > 0.1 then
			rotVelocity = rotVelocity + humanoidRootPart.CFrame:vectorToWorldSpace((Vector3.new(0, -movement.X * speed * stats.TurnSpeed.Value, 0)))
			bodyAngularVelocity.maxTorque = Vector3.new(0, 0, 0)
		else
			bodyAngularVelocity.maxTorque = Vector3.new(mass / 4, mass / 2, mass / 4)
		end
		humanoidRootPart.RotVelocity = humanoidRootPart.RotVelocity:Lerp(rotVelocity, 0.1)

		--bodyVelocity.maxForce = Vector3.new(mass / 3, mass / 6, mass / 3)
		--bodyAngularVelocity.maxTorque = Vector3.new(mass / 6, mass / 3, mass / 6)
	else
		bodyVelocity.maxForce = Vector3.new(0, 0, 0)
		bodyAngularVelocity.maxTorque = Vector3.new(0, 0, 0)
	end

	for i, part in pairs(car:GetChildren()) do
		if part.Name == "Thruster" then
			UpdateThruster(part)
		end
	end
end
for i, v in pairs(car:GetChildren()) do
	if v:FindFirstChild("BodyThrust") then
		v.BodyThrust:Destroy()
	end
end
bodyVelocity:Destroy()
bodyAngularVelocity:Destroy()
--camera.CameraType = oldCameraType
script:Destroy()
--end)
#14

Thank you, I have recieved it now.

1 Like
#15

I would leave all the comments as comments and not turn them into functional lines of code cuz I think that breaks it for some reason or at least makes it less smooth

1 Like
#16

Thank you so much! I’ll edit this to change its way of figuring out when to move or not to try and figure out a way to decelerate it

#17

You can just use s or the back arrow to make it go slower

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#18

Welp… ima go to dreamland now… nite😴

1 Like
#19

Thank you for all your help, goodnight!

1 Like