How would I change the acceleration of this bodyposition/velocity (Vehicle)?

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6 years ago

Hello all! Back again with another question. I have created a vehicle using bodygyro, bodyposition,etc. I used the scripts from the jeep model on the race prebuilt map and modified them slightly to meet my needs. Basically I am creating a gearing system for my vehicles. Depending on what gear you are in, depends on how fast you are able to go. So far I have everything working, the vehicle drives, turns, and even can shift gears. However, my issue is that the vehicle accelerates very quickly, almost max speed instantly. My shifting script is based on speed, if you aren't going fast enough to shift gears, it won't let you, but being as the vehicle accelerates instantly, players can just spam the shift gear button and would defeat the purpose of shifting.

I'm basically trying to figure out how to make the velocity of the vehicle take time to reach its max. I know about MaxThrust, MaxTorque, and MaxForce, however with the Jeep script, editing any value also affects the turning. I was able to make the script slowly accelerate by editing the Lerp value, however that also made the turning wonky, causing it to go really fast while turning, or not turn at all. My question is what values do I need to be adjusting, need to add into the current script, to make it not accelerate to max speed instantly? I know about D and P aswell, but changing those values didn't affect anything. My assumption is because those values are used in relation to destination. Obviously a vehicle driving around has no set destination, therefor it can't damper it.

LocalCarScript

001--local camera = game.Workspace.CurrentCamera
002local player = game.Players.LocalPlayer
003local character = player.Character
004local humanoidRootPart = character.HumanoidRootPart
005local car = script:WaitForChild("Car").Value
006local stats = car:WaitForChild("Configurations")
007local Raycast = require(car.CarScript.RaycastModule)
008local object = car.Chassis -- your object here
009local gear = stats.Gear
010--local cameraType = Enum.CameraType.Follow
011 
012local movement = Vector2.new()
013local gamepadDeadzone = 0.14
014 
015car.DriveSeat.Changed:connect(function(property)
016    if property == "Steer" then
017        movement = Vector2.new(car.DriveSeat.Steer, movement.Y)
018    elseif property == "Throttle" then
019        movement = Vector2.new(movement.X, car.DriveSeat.Throttle)
020    end
021end)
022 
023-- Input begin
024--game:GetService("UserInputService").InputBegan:connect(function(inputObject, gameProcessedEvent)
025--  if not gameProcessedEvent then
026--      if inputObject.KeyCode == Enum.KeyCode.W then
027--          movement = Vector2.new(movement.X, 1)
028--      elseif inputObject.KeyCode == Enum.KeyCode.A then
029--          movement = Vector2.new(-1, movement.Y)
030--      elseif inputObject.KeyCode == Enum.KeyCode.S then
031--          movement = Vector2.new(movement.X, -1)
032--      elseif inputObject.KeyCode == Enum.KeyCode.D then
033--          movement = Vector2.new(1, movement.Y)
034--      end
035--  end
036--end)
037--
038--game:GetService("UserInputService").InputChanged:connect(function(inputObject, gameProcessedEvent)
039--  --if not gameProcessedEvent then
040--      if inputObject.KeyCode == Enum.KeyCode.Thumbstick1 then
041--          --Gamepad support because yay
042--          if inputObject.Position.magnitude >= gamepadDeadzone then
043--              movement = Vector2.new(movement.X, inputObject.Position.Y)
044--          else
045--              movement = Vector2.new(movement.X, 0)
046--          end
047--      elseif inputObject.KeyCode == Enum.KeyCode.Thumbstick2 then
048--          if inputObject.Position.magnitude >= gamepadDeadzone then
049--              movement = Vector2.new(inputObject.Position.X, movement.Y)
050--          else
051--              movement = Vector2.new(0, movement.Y)
052--          end
053--      end
054--  --end
055--end)
056--
057---- Input end
058--game:GetService("UserInputService").InputEnded:connect(function(inputObject, gameProcessedEvent)
059--  if inputObject.KeyCode == Enum.KeyCode.W then
060--      if movement.Y == 1 then
061--          movement = Vector2.new(movement.X, 0)
062--      end
063--  elseif inputObject.KeyCode == Enum.KeyCode.A then
064--      if movement.X == -1 then
065--          movement = Vector2.new(0, movement.Y)
066--      end
067--  elseif inputObject.KeyCode == Enum.KeyCode.S then
068--      if movement.Y == -1 then
069--          movement = Vector2.new(movement.X, 0)
070--      end
071--  elseif inputObject.KeyCode == Enum.KeyCode.D then
072--      if movement.X == 1 then
073--          movement = Vector2.new(0, movement.Y)
074--      end
075--  end
076--end)
077 
078local force = 0
079local damping = 0
080 
081local mass = 0
082 
083for i, v in pairs(car:GetChildren()) do
084    if v:IsA("BasePart") then
085        mass = mass + (v:GetMass() * 196.2)
086    end
087end
088 
089force = mass * stats.Suspension.Value
090damping = force / stats.Bounce.Value
091 
092local bodyVelocity = Instance.new("BodyVelocity", car.Chassis)
093bodyVelocity.velocity = Vector3.new(0, 0, 0)
094bodyVelocity.maxForce = Vector3.new(0, 0, 0)
095 
096local bodyAngularVelocity = Instance.new("BodyAngularVelocity", car.Chassis)
097bodyAngularVelocity.angularvelocity = Vector3.new(0, 0, 0)
098bodyAngularVelocity.maxTorque = Vector3.new(0, 0, 0)
099 
100local rotation = 0
101 
102local function UpdateThruster(thruster)
103    --Make sure we have a bodythrust to move the wheel
104    local bodyThrust = thruster:FindFirstChild("BodyThrust")
105    if not bodyThrust then
106        bodyThrust = Instance.new("BodyThrust", thruster)
107    end
108    --Do some raycasting to get the height of the wheel
109    local hit, position = Raycast.new(thruster.Position, thruster.CFrame:vectorToWorldSpace(Vector3.new(0, -1, 0)) * stats.Height.Value)
110    local thrusterHeight = (position - thruster.Position).magnitude
111    if hit and hit.CanCollide then
112        --If we're on the ground, apply some forces to push the wheel up
113        bodyThrust.force = Vector3.new(0, ((stats.Height.Value - thrusterHeight)^2) * (force / stats.Height.Value^2), 0)
114        local thrusterDamping = thruster.CFrame:toObjectSpace(CFrame.new(thruster.Velocity + thruster.Position)).p * damping
115        bodyThrust.force = bodyThrust.force - Vector3.new(0, thrusterDamping.Y, 0)
116    else
117        bodyThrust.force = Vector3.new(0, 0, 0)
118    end
119end
120 
121--Shifting Function
122function onKeyPress(inputObject, gameProcessedEvent)
123    if inputObject.KeyCode == Enum.KeyCode.E then
124        if character.Humanoid.SeatPart == car.DriveSeat then
125        if gear.Value < 18 then
126            gear.Value = gear.Value + 1
127            print(gear.Value)
128        end
129        end
130    elseif inputObject.KeyCode == Enum.KeyCode.Q then
131        if character.Humanoid.SeatPart == car.DriveSeat then
132        if gear.Value > 0 and gear.Value <= 18 then
133            gear.Value = gear.Value - 1
134            print(gear.Value)
135        end
136        end
137        end
138end
139 
140game:GetService("UserInputService").InputBegan:connect(onKeyPress)
141 
142--A simple function to check if the car is grounded
143local function IsGrounded()
144    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))
145    if hit and hit.CanCollide then
146        return(true)
147    end
148    return(false)
149end
150 
151--local oldCameraType = camera.CameraType
152--camera.CameraType = cameraType
153 
154--spawn(function()
155    while game:GetService("RunService").Heartbeat:wait() and car:FindFirstChild("DriveSeat") and character.Humanoid.SeatPart == car.DriveSeat do
156        --game:GetService("RunService").RenderStepped:wait()
157        if IsGrounded() then
158            if movement.Y ~= 0 then
159                local velocity = humanoidRootPart.CFrame.lookVector * movement.Y * stats.Speed.Value
160                humanoidRootPart.Velocity = humanoidRootPart.Velocity:Lerp(velocity, 0.1)
161                bodyVelocity.maxForce = Vector3.new(0, 0, 0)
162            else
163                bodyVelocity.maxForce = Vector3.new(mass / 2, mass / 4, mass / 2)
164            end
165            local rotVelocity = humanoidRootPart.CFrame:vectorToWorldSpace(Vector3.new(movement.Y * stats.Speed.Value / 50, 0, -humanoidRootPart.RotVelocity.Y * 5 * movement.Y))
166            local speed = -humanoidRootPart.CFrame:vectorToObjectSpace(humanoidRootPart.Velocity).unit.Z
167            rotation = rotation + math.rad((-stats.Speed.Value / 500) * movement.Y)
168            if math.abs(speed) > 0.1 then
169                rotVelocity = rotVelocity + humanoidRootPart.CFrame:vectorToWorldSpace((Vector3.new(0, -movement.X * speed * stats.TurnSpeed.Value, 0)))
170                bodyAngularVelocity.maxTorque = Vector3.new(0, 0, 0)
171            else
172                bodyAngularVelocity.maxTorque = Vector3.new(mass / 4, mass / 2, mass / 4)
173            end
174            humanoidRootPart.RotVelocity = humanoidRootPart.RotVelocity:Lerp(rotVelocity, .1)
175 
176            --bodyVelocity.maxForce = Vector3.new(mass / 3, mass / 6, mass / 3)
177            --bodyAngularVelocity.maxTorque = Vector3.new(mass / 6, mass / 3, mass / 6)
178        else
179            bodyVelocity.maxForce = Vector3.new(0, 0, 0)
180            bodyAngularVelocity.maxTorque = Vector3.new(0, 0, 0)
181        end
182 
183        for i, part in pairs(car:GetChildren()) do
184            if part.Name == "Thruster" then
185                UpdateThruster(part)
186            end
187        end
188    end
189    for i, v in pairs(car:GetChildren()) do
190        if v:FindFirstChild("BodyThrust") then
191            v.BodyThrust:Destroy()
192        end
193    end
194    bodyVelocity:Destroy()
195    bodyAngularVelocity:Destroy()
196    gear.Value = 0
197    --camera.CameraType = oldCameraType
198    script:Destroy()
199--end)
 View all 199 lines...

How did you have the patience to write almost 200 lines of code what could be written in 50-75? User#19524 175 — 6y

This script came from a jeep inside one the pre-built maps you can choose from when starting a new game. Everything related to BodyGyros, BodyPosition, etc is new to me, so I was using this script as a bases to learn from, and to understand how it works. But i'm stumped on acceleration. WizyTheNinja 834 — 6y

How would I change the acceleration of this bodyposition/velocity (Vehicle)?

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