Why doesn't my collision detection between two Area2D objects in Godot 4 work?

In summary, There could be several reasons for two Area2D objects not colliding in Godot 4. Make sure both objects have a collision shape and proper collision layers and masks, and that the nodes are active and enabled. To check if collision detection is happening, use the area_entered or body_entered signals, or print the collision_layer and collision_mask properties. Both signals can be used for collision detection, but the body_entered signal is only emitted for objects with a physics body. If the objects have different collision layers and masks, they will not collide, so make sure they have at least one shared layer and mask. Collision detection can affect performance, so it's important to optimize by disabling it for distant objects or using
  • #1
Darkmisc
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TL;DR Summary
I've followed steps from a tutorial on how to set up collision detection between two Area2D objects. It's not working and I can't figure out why.
Hi everyone

I'd like to detect collisions between a circle and a floor.

I have set them up as follows:

1684196663869.png

1684196709419.png
1684196621540.png


1684196743781.png
The script runs fine (it's just a circle falling towards the floor), but nothing happens when the two objects collide.

Does anyone know what I've done wrong?Thanks
 
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  • #2
Darkmisc said:
Does anyone know what I've done wrong?
Yes, (1) following a tutorial blindly without thinking and (2) giving up before you have tried to find the problem.

Before you add the 'if body.is_in_group' code you should test to see if the '_on_body_entered' event is firing.
 

FAQ: Why doesn't my collision detection between two Area2D objects in Godot 4 work?

Why isn't my collision detection working between two Area2D objects in Godot 4?

One common reason for collision detection not working between two Area2D objects in Godot 4 is that you may have forgotten to enable collision on one or both of the objects. Make sure that both Area2D objects have their "Monitorable" property checked in the Inspector panel.

I have enabled collision on both Area2D objects, but they still don't detect collisions. What could be the issue?

Another possible reason for collision detection not working is that the collision layers and masks of the two objects are not set up correctly. Check the collision layers and masks properties of both Area2D objects to ensure that they are set up in a way that allows them to detect collisions with each other.

My collision detection was working fine before, but now it has suddenly stopped. What might have caused this issue?

If your collision detection was working fine before but has suddenly stopped, it could be due to changes in the physics process order or the way collisions are being handled in your code. Make sure that the physics process order is set up correctly and that you are handling collisions properly in your script.

I have tried everything, but my collision detection still doesn't work. Is there anything else I can check?

If you have tried all the above solutions and your collision detection still doesn't work, double-check that the collision shapes of the two Area2D objects are set up correctly and are not overlapping or incorrectly positioned. Even a small misalignment in the collision shapes can prevent collisions from being detected.

Are there any specific settings in Godot 4 that I need to configure for collision detection between Area2D objects?

In Godot 4, make sure that the collision layers and masks are set up correctly for the Area2D objects you want to detect collisions between. Additionally, you can use the "test_only" property to ensure that collisions are only detected for testing purposes without affecting the physics simulation.

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