ScriptReference/MonoBehaviour.OnCollisionEnter2D

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ScriptReference/MonoBehaviour.OnCollisionEnter2D

https://docs.unity3d.com/ScriptReference/MonoBehaviour.OnCollisionEnter2D.html

[jschiff]

Note that collision detection runs as part of the physics simulation phase of the game loop, which leads to a few gotchas. For example, OnCollisionEnter2D will not run in any of the following circumstances:

• Time.timeScale is set to 0
• Physics.autoSimulation is disabled (via script or in project settings)
• Objects are moved into an overlapping state manually at any point in the game loop, e.g. Update, or even FixedUpdate. The collision will not happen until the physics simulation runs.