Rigidbody2D behaves differently/broken when scene gets instantiated

Help Physics
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1

Godot Version

v4.4.stable.official [4c311cbee]

Question

Hi everyone! =D
I am having a bizarre problem with my RigidBodies. I want to build a small chat system where the new messages get typed out on top and then fall down to the bottom. I figured out how to do this and it works well in the scene I have built this system (it’s not fluid bc I made a GIF from the recording):

works

Once the message is written I resize the CollisionShape to the size of the MarginContainer and unfreeze the RigidBody → Then the message falls.

emotion_scene
emotion_scene382×175 5.62 KB

Right when this happens I also reparent the RigidBody to a Node2D in order to sort of archive the message and make room for the next one. The code looks as follows:

func archiving():
	var shape = RectangleShape2D.new()
	current_frame.position = current_coat.position + current_coat.size / 2
	shape.size = current_coat.size
	current_frame.set_shape(shape)

	current_emotion.freeze = false
	current_emotion.reparent($archive, true)

Now when I access this whole event from my RootScene the physics don’t work at all anymore (I highlighted the CollisionShapes from the StaticBody that should keep the messages in place):
doesnt

As you can see it’s absolutely broken. I do know that something is up with the CollsionShapes of the RigidBodies because when I don’t resize them and keep them small it works!
Another issue that was happening was, that the Rigidbodies suddenly scaled to (2.8, 2.8) once they unfreezed in the latter example. I “fixed” this with telling the Rigidbodies to always keep being scaled to (1, 1) in the _physics_process.
I do move the RigidBodies position while they are frozen but once I unfreeze them I don’t manipulate them at all. So I think it does have something to do with resizing the CollisionShape. Does anyone maybe have a clue? :slight_smile:
Thanks for reading!

2

The CollisionShape’s position may be problematic, if the RigidBody’s position is far away from the child collision shape it’s center of mass will usually be around the RigidBody’s position, making a very strange pivot. Try setting the current_emotion’s position instead, and keep the current_frame.position at zero; avoid using reparent(..., true) if you can.

1 Like
3

thank so much @gertkeno ! In the end I found out that the problem was that the RigidBody scaled itself to 2.8 when i added it as a child to a node that scaled it down to 0.35x (which equals to 1 in the end). Once I rescaled to children of RigidBody2D and made some other adjustments to their sizes and positions, everything works in the RootScene! :sunny: