Setting position of a RigidBody2D

Question

Hi there!

I'm trying to set the position (to restore all elements back to their original position when the player dies) of a RigidBody2D with RigidBody2D::set_pos but unfortunately, it don't doesn't change the position.
Is there any other way than set_pos()?

Best regards,
Timo

Comments

(Not an answer, since its a workaround), but if you make the level a scene, and when the player dies, delete and reinstance the level node, you won't have to return everything to original values.

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BTW, are you using _process to update the positions?

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I am using a save-anywhere mechanism, so I'm saving position and velocity of every object when saving the game. And no, I'm using a function which is called at the and of an animation played in an AnimationPlayer.

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And btw doesn't reinstancing the scene take loading time?

Answer 1

Please make sure to always call set_pos and set_global_pos inside a fixed process for physics objects, even when resetting them. See the docs.

This is a very common pitfall when dealing with Godot physics. It tricked me more than once.

Example:

var should_die = false

func _ready():
    set_fixed_process(true)

func reset():
    should_reset = false
    set_global_pos(Vector2(0,0))

func _fixed_process(delta):
    if should_reset:
        # CORRECT
        # Will always work
        reset()

        # WRONG
        # Might not work
        # same goes if called from _process or input signal/_input callback
        call_deferred("reset") 

EDIT: The same apply for set_linear_velocity set_angular_velocity. Setter and getters alike (you might get incorrect values from getters outside of the fixed process).

Answer 2

try set_global_pos()

Answer 3

When I try to set the position or rotation of a Rigidbody2D in the _physics_process function in Godot 3.0, the body immediately jumps back to its previous position.

It only works in the _integrate_forces function where I check if a reset variable was set to true and then I reset the body in this way:

func _integrate_forces(state):
    if reset:
        state.transform = Transform2D(start_angle, start_pos)
        state.linear_velocity = Vector2()
        reset = false

Comments

How do i move the rigidbody to a position2d using this?