How to slow down car that uses body force

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#1

Hi,
Okay i have a car that uses body force to move, but i got a few issues:

  1. Im not good at math, how to make a static car speed? Currently i use this to make speed for car, but its make my car extremely fast.

bodyForce.Force = humanoidRootPart.CFrame.lookVector * movement.Y * (mass + stats.Speed.Value)

stats.Speed.Value is 60
movement.Y is basically where car moves (forward or backward)
mass is mass of all car parts * gravity multiplier

  1. I don’t know how to stop my car. When i no longer press W to drive it still moves…

To slow down car i do bodyForce.Force = Vector3.new(0,0,0)

I just recently started using Body Movers so idk how they work i use the info provided in DevHub but still understand a little.

#2

For a crude fix I suggest just making the same thing as speeding up but reversing the direction. To reverse direction simply multiply by negative one

2 Likes
#3

I agree with @SuperZebe1. You could do that but you might have to do that in a for loop so it’s not harsh.

1 Like
#4

I did and it work i guess!

But… Here is how fast my car with 1 stats.Speed.Value. I would like to make something better, but im not good at it. Do you have any ideas how to make better Force calculating thingy?

https://gyazo.com/c399927310b70ef08e2fecfa19505d63

#5

Try changing the math where you calculate the body velocity, tweek it until you feel like it’s the right speed.
Edit i don’t have a computer at the ready but try something like HumanoidRootPart.CFrame.lookVector * speed
If the speed changes depending on where you look then try adding .Unit after HumanoidRootPart.CFrame.lookVector

#6

Does your car use wheels with hinges to roll? You could try setting a torque force on that to brake when you release W.

#7

It don’t work, probably because BodyForce’s Force property should be bigger than mass of car to be able to push it? I tried and if i don’t multiply lookvector by mass of car it won’t move

#8

No, my car is just a model with VehicleSit, but VehicleSit don’t actually do anything except make player sit in car and i check through VehicleSit property Throttle if player is driving and if so where (forward or backward). The car movement i do in script

#9

Make a part in the center of the car and make it the primary part
Make sure the front surface is facing the same as the front of the car.

bodyForce.Force = carPrimary.CFrame.lookVector*((movement.Y * (mass + stats.Speed.Value))/5)

not sure if this would work

#10

Also try to reduce movement Y. that may be the problem