Help finding something in the default jeep

Help and Feedback Scripting Support
#1

Hi,

I’m trying to understand the code of the default jeep in the suburban template but I can’t seem to find the code where it calculates if the player presses W, for example, the vehicle will move. I’m trying to fin it so I can try to add acceleration to the chassis. Thanks

-- This is CarScript
--Scripted by DermonDarble

local car = script.Parent
local stats = car.Configurations
local Raycast = require(script.RaycastModule)

local mass = 0

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

local bodyPosition = car.Chassis.BodyPosition
local bodyGyro = car.Chassis.BodyGyro

--local bodyPosition = Instance.new("BodyPosition", car.Chassis)
--bodyPosition.MaxForce = Vector3.new()
--local bodyGyro = Instance.new("BodyGyro", car.Chassis)
--bodyGyro.MaxTorque = Vector3.new()

local function UpdateThruster(thruster)
	-- Raycasting
	local hit, position = Raycast.new(thruster.Position, thruster.CFrame:vectorToWorldSpace(Vector3.new(0, -1, 0)) * stats.Height.Value) --game.Workspace:FindPartOnRay(ray, car)
	local thrusterHeight = (position - thruster.Position).magnitude
	
	-- Wheel
	local wheelWeld = thruster:FindFirstChild("WheelWeld")
	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
	
	-- Particles
	if hit and thruster.Velocity.magnitude >= 25 then
		wheelWeld.Part1.ParticleEmitter.Enabled = true
	else
		wheelWeld.Part1.ParticleEmitter.Enabled = false
	end
end

car.DriveSeat.Changed:connect(function(property)
	if property == "Occupant" then
		if car.DriveSeat.Occupant then
			car.EngineBlock.Running.Pitch = 1
			car.EngineBlock.Running:Play()
			local player = game.Players:GetPlayerFromCharacter(car.DriveSeat.Occupant.Parent)
			if player then
				car.DriveSeat:SetNetworkOwner(player)
				local localCarScript = script.LocalCarScript:Clone()
				localCarScript.Parent = player.PlayerGui
				localCarScript.Car.Value = car
				localCarScript.Disabled = false
			end
		else
			car.EngineBlock.Running:Stop()
		end
	end
end)

--spawn(function()
	while true do
		game:GetService("RunService").Stepped:wait()
		for i, part in pairs(car:GetChildren()) do
			if part.Name == "Thruster" then
				UpdateThruster(part)
			end
		end
		if car.DriveSeat.Occupant then
			local ratio = car.DriveSeat.Velocity.magnitude / stats.Speed.Value
			car.EngineBlock.Running.Pitch = 1 + ratio / 4
			bodyPosition.MaxForce = Vector3.new()
			bodyGyro.MaxTorque = Vector3.new()
		else
			local hit, position, normal = Raycast.new(car.Chassis.Position, car.Chassis.CFrame:vectorToWorldSpace(Vector3.new(0, -1, 0)) * stats.Height.Value)
			if hit and hit.CanCollide then
				bodyPosition.MaxForce = Vector3.new(mass / 5, math.huge, mass / 5)
				bodyPosition.Position = (CFrame.new(position, position + normal) * CFrame.new(0, 0, -stats.Height.Value + 0.5)).p
				bodyGyro.MaxTorque = Vector3.new(math.huge, 0, math.huge)
				bodyGyro.CFrame = CFrame.new(position, position + normal) * CFrame.Angles(-math.pi/2, 0, 0)
			else
				bodyPosition.MaxForce = Vector3.new()
				bodyGyro.MaxTorque = Vector3.new()
			end
		end
	end
--end)


-- This is LocalCarScript inside the CarScript

--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 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)
--
--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)

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()
	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)
#2

It could be the car.DriveSeat.Changed function, probably because the DriveSeat is a VehicleSeat, and it acts different than normal seats. I am not experienced with VehicleSeats.

1 Like
#3

VehicleSeats take in player input so you need to look for the Steer and Throttle inputs (1, 0 and -1).

1 Like
#4

@octav20071 That is highly accurate but not as precise. It is somewhere there but a little deeper within and it’s true the script is a lot different from the old VehicleSeat cars which use the olde hinge detection from :MakeJoints() tp make the motors spin.

All the actual driving movement is located in the local script, where the car actually oddly enough applies the velocity to the humanoid RootPart.

If you want the jeep to accelerate to the target velocity faster you can edit the second parameter of the lerp function which has been set to a constant 0.1 .

A better method would be to use deltaTime to make the acceleration framerate independent like how @ThanksRoBama has done it by lerping a characters humanoid root part velocity and lerps it to dt * moveAcceleration in a math.clamp to prevent the lerping to exceed the goal velocity alpha = 1.

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#5

Thank you, this worked just as you said. I appreciate it :grinning: