Weird behaviour when adding collisionShape2D

[lao]

Godot Version

v4.2.1.stable.official [b09f793f5]

Question

New to Godot. I’m trying to make a flappybird-like game as practice.
I’m encountering some strange behaviour however: when pressing space some up velocity is added, however, when the player object has a collisionShape2d (or polygon) the movement is like it’s bouncing on all kinds of invisible object. When removing the CollisionShape2D, the movement when pressing space is as expected.
See GitHub - Lhaaits/kittytoots-godot for the project. Run player.tscn and press space a couple times to reproduce the strange behaviour.
I’ve also added 2 screen recordings to the repo:
kittytoots-godot/blob/main/BugWithCollision.mov
kittytoots-godot/blob/main/WorkingWithoutCollision.mov
You can click download raw to the right to download them.
Does anyone know why adding the collisionShape is causing weird side effects?

[pauldrewett]

In the Godot Editor, in the top menu you have:
Scene, Project, Debug, Editor, Help

Click Debug and select ‘Visible Collision Shapes’.

You should then be able to see what your collision shape is colliding with.

I suspect you are not moving the shape with your flappy bird, but you should easily be able to tell what is happening when the shapes visible.

Hope that helps,

Paul

[lao]

Omg, thanks for the tip! That helped me solve it! The collisionshapes from the balloons where falling instead of moving with the player, causing them to collide.