Setting a velocity for walking?

Question

At the minute I have a simple 2D setup. There is a function called in _process() to handle inputs. If it detects a jump key, I use apply_central_impulse() to make the rigidbody move upwards and fall as normal, and this works fine. I want to make it so that pressing right, for example, makes the character move right. The problem is, I don't want to apply a force, because the movement is slow at first as it accelerates. The character should move at a speed when pressed, and not move at all when the key is not held. How do I achieve this? The docs warn against directly changing the velocity of a rigidbody directly.

Answer 1

Hi,
use the integrateforces method

https://docs.godotengine.org/en/stable/classes/class_rigidbody.html#class-rigidbody-method-integrate-forces

There you get the directBodyState

https://docs.godotengine.org/en/stable/classes/class_physicsdirectbodystate.html#class-physicsdirectbodystate

in there is linear_velocity ... and thats what you're searching for ;-)

Comments

I have tried something like this:

func _process(delta):
    manage_inputs()

func manage_inputs():
    var moving = false
    if Input.is_action_just_pressed("ui_up"):
        if linear_velocity.y == 0:
            jump()
    if Input.is_action_pressed("ui_right"):
        move("right")
        moving = true
    if Input.is_action_pressed("ui_left"):
        move("left")
        moving = true
    if !moving:
        vel_linear.x = 0

func jump():
    apply_central_impulse(Vector2(0, -1000))

func move(direction):
    if direction == "right":
        vel_linear.x = 400
    if direction == "left":
        vel_linear.x = -400

func _integrate_forces(state):
    state.linear_velocity.x = vel_linear.x

But doing things in this way causes the character to sporadically freeze when moving continuously. What's up with that? Are there any alternative solutions?

---

Hi,
i've just tested it ... runs fine by me. Must be something else. Perhaps the surface the body glides on?