private void OnTriggerEnter(Collider other)

{

    //Do something

}

// When other object enter the trigger zone

private void OnTriggerEnter(Collider other){

    // Do what you want

    // Example, if you want to check object "object1" enter the trigger zone

    if(other.gameObject.name == "object1"){

        // Do what you want

    }

}

​

// When other object stay in the trigger zone

private void OnTriggerStay(Collider other){

    // Do what you want

    // Example, if you want to check the object "object1" stay in the trigger zone

    if(other.gameObject.name == "object1"){

        // Do what you want

    }

}

​

// When other object exit the trigger zone

private void OnTriggerExit(Collider other){

    // Do what you want

    // Example, if you want to check the object "object1" exit the trigger zone

    if(other.gameObject.name == "object1"){

        // Do what you want

    }

}