How would I be able to make a sound play if a vehicle rolls backwards

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#1

I’m making a truck and I want a beeping sound to play when you roll backwards. I want to use AssemblyLinearVelocity but I don’t know how to detect just the forward and backward movement on its own.

#2

you can play around with the truck’s main center point’s velocity and using some input service

it may not work since im not good with keybind-related things but you could try making a script where if you hit S, a bool value which you can name goinBack is set to true and using if Truck.Body.Velocity > amountThatIsHighEnoughToCauseBeepingIGuess and goinBack.Value == true then beepbeep:Play()

hopefully it gives u some clues and requires some basic knowledge

#3

But then if you were to brake without making a full stop/rolling backwards, the alarm would just play since Velocity doesn’t detect backwards or forwards movement. That’s why I want someone to help me with using AssemblyLinearVelocity.

#4

You can get the vehicle’s velocity vector relative to its cframe and then compare the Z co-ordinate:

local relVel = Chassis.CFrame:VectorToObjectSpace(Chassis.AssemblyLinearVelocity)

if relVel.Z > 0 then
    -- vehicle is going backwards
end

Perhaps have this run in a Changed event or a Heartbeat loop and make sure the sound doesn’t play again if it is already playing

#5

yeah i added the input service for a reason, anyways the velocity statement is triggered when it reaches high speeds and naturally when u slow down aka letting go of the key, the velocity gets lower and lower till it doesnt meet the statement’s requirement