Math Help - Car MPH

Help
1

Godot Version

4.6.2

Question

I am very lost on Vector math. I have tried to learn it but I just don’t understand it. The reason this arises is I am trying to make a camera nodes FOV increase with a curve based on the MPH of the car. I have no idea how I would normalize. So. I can sample a curve.

class_name CarComponent
extends Node

@export var car : VehicleBody3D

@export var speed := 100.0
@export var turn_amount := 0.3

var move_dir := Vector2.ZERO

func car_update(delta: float):
	car.engine_force = speed * move_dir.y
	car.steering = move_toward(car.steering, (turn_amount * move_dir.x), delta)

func get_mph() -> float:
	var mps = car.linear_velocity.length()
	var mph = mps * 2.237
	return mph


class_name CameraComponent
extends Camera3D

@export var fov_curve : Curve
var mph := 0.0

The camera component has much less as I am struggling a lot on the math.

2

Why do you need to normalize? You can set curve’s domain to your mph range.

If you still want to normalize it, just divide it with maximal mph.

3

I looked things up and found

class_name CameraComponent
extends Camera3D

@export var fov_curve : Curve
@export var max_fov := 100.0
@export var min_fov := 70.0
var mph := 0.0

func camera_update():
	var fov_multiplier = fov_curve.sample(sigmoid(mph))
	fov = max_fov * fov_multiplier
	fov = clamp(fov, min_fov, max_fov)

func sigmoid(x):
	return 1 / (1 + exp(-x))

It works so I will keep this

4

I should have explained better thats my bad. I have having trouble getting the MPH range.

5

If the range is unknown then using the logistic function as you do is a good approach. You might still want to scale the domain so that the curve doesn’t go to its maximal value of 1.0 too early.

6

Thank you.