An easy to work with jump in Godot

better_jumping_character_example.gd

extends KinematicBody2D

export var move_speed = 200.0

var velocity := Vector2.ZERO

export var jump_height : float
export var jump_time_to_peak : float
export var jump_time_to_descent : float

onready var jump_velocity : float = ((2.0 * jump_height) / jump_time_to_peak) * -1.0
onready var jump_gravity : float = ((-2.0 * jump_height) / (jump_time_to_peak * jump_time_to_peak)) * -1.0
onready var fall_gravity : float = ((-2.0 * jump_height) / (jump_time_to_descent * jump_time_to_descent)) * -1.0

func _physics_process(delta):
	velocity.y += get_gravity() * delta
	velocity.x = get_input_velocity() * move_speed
	
	if Input.is_action_just_pressed("jump") and is_on_floor():
		jump()
	
	velocity = move_and_slide(velocity, Vector2.UP)

func get_gravity() -> float:
	return jump_gravity if velocity.y < 0.0 else fall_gravity

func jump():
	velocity.y = jump_velocity

func get_input_velocity() -> float:
	var horizontal := 0.0
	
	if Input.is_action_pressed("left"):
		horizontal -= 1.0
	if Input.is_action_pressed("right"):
		horizontal += 1.0
	
	return horizontal

My jump behaves inconsistently some times for example when I printed the values of y velocity every frame. Normally it looks like this 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 -134.16667175293 -128.333343505859 -122.500007629395 -116.66667175293 -110.833335876465 -105.0 -99.1666641235352 -93.3333282470703 -87.4999923706055 -81.6666564941406 -75.8333206176758 -69.9999847412109 -64.1666488647461 -58.3333168029785 -52.4999847412109 -46.6666526794434 -40.8333206176758 -34.9999885559082 -29.166654586792 -23.3333206176758 -17.4999866485596 -11.6666536331177 -5.83332014083862 0.00001319249441 0.00001319249441 0.00001319249441 0.00001319249441 0.00001319249441 0.00001319249441 0.00001319249441 0.0 but sometimes it looks like this .0 0.0 0.0 0.0 0.0 0.0 0.0 -134.16667175293 -128.333343505859 -111.666679382324 -95.0000152587891 -78.3333511352539 -61.6666831970215 -45.0000152587891 -28.3333492279053 -11.6666822433472 4.99998426437378 4.99998426437378 4.99998426437378 4.99998426437378 4.99998426437378 4.99998426437378 4.99998426437378 4.99998426437378 4.99998426437378 4.99998426437378 4.99998426437378 4.99998426437378 4.99998426437378 4.99998426437378 4.99998426437378 4.99998426437378 4.99998426437378 4.99998426437378 4.99998426437378 4.99998426437378 4.99998426437378 0.0 0.0 And that other velocity curve doesn't go as high does anyone have any Idea what I should do? turning up the physics tick rate seemed to lessen the issue but not eliminate it.

I have made a video on this problem: https://youtu.be/YBNSPAvmLoA?si=QVyVY_x29919cFVN

Just commenting to confirm, this code does work on Godot 4.6.3. However, a few keywords were removed moving into Godot 4. The errors will prompt you to just change all of the "onready" and "export" statements so they start with "@" I also added the following bit of code to this.

if Input.is_action_just_released("jump") and velocity.y
# Decrease Jump Velocity
velocity.y *= _jump_cut_off_value

Add a var to so it works correctly: "_var _jump_cut_off_value : float = 0.4"