GODOT - 3d Gravity

Example 1 :

var jump_force : float = 10.0
var gravity : float = 15.0
var velocity = Vector3()
func _physics_process (delta):
    # Apply gravity every frame if possible
    velocity.y -= gravity * delta
    # Jumping
    if Input.is_action_pressed("jump") and is_on_floor():
        velocity.y = jump_force
    velocity = move_and_slide(velocity, Vector3.UP)