Other considerations for 2D physics messages#

Correct Colliders#

Ensure the dimension of the colliders and rigidbodies are 2D.
Don't mix different types of colliders and messages.
2D and 3D collision systems are separate, and do not interact with each other.

Simulation Layers#

Enable the involved Simulation Layers in the Physics 2D Project settings.
Simulation layers were introduced in 2023.1.

The obvious#

1. Your script must be attached to one of the objects involved in the collision.
2. The colliders on your objects must be enabled.
3. Rigidbodies involved in the collision must have Simulated enabled.

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