To detect trigger between two prefabs which are not in the hierarchy scene via empty gameobject

Questions & Answers
1

I m trying to make trigger between two prefabs . And reference of public gameobject cannot be given to prefab .How to make it work .
Please help

2

Use Physics Layers. Quick example:

private void OnTriggerEnter(Collider other)
{
    if (other.gameObject.layer == 1 << LayerMask.NameToLayer("ExampleLayer")
        // Do something
}

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