GameObject.Find

Description

Находит объект с именем name и возвращает его.

This function only returns active GameObjects. If no GameObject with name can be found, null is returned. If name contains a '/' character, it traverses the hierarchy like a path name.

вместо этого, при запуске кэшируйте (храните) результат функции в поле или используйте GameObject.FindWithTag.

Note: If you wish to find a child GameObject, it is often easier to use Transform.Find.

Note: If the game is running with multiple scenes then Find will search in all of them.

using UnityEngine;
using System.Collections;

// This returns the GameObject named Hand in one of the Scenes.

public class ExampleClass : MonoBehaviour
{
    public GameObject hand;

    void Example()
    {
        // This returns the GameObject named Hand.
        hand = GameObject.Find("Hand");

        // This returns the GameObject named Hand.
        // Hand must not have a parent in the Hierarchy view.
        hand = GameObject.Find("/Hand");

        // This returns the GameObject named Hand,
        // which is a child of Arm > Monster.
        // Monster must not have a parent in the Hierarchy view.
        hand = GameObject.Find("/Monster/Arm/Hand");

        // This returns the GameObject named Hand,
        // which is a child of Arm > Monster.
        hand = GameObject.Find("Monster/Arm/Hand");
    }
}

GameObject.Find is useful for automatically connecting references to other objects at load time; for example, inside MonoBehaviour.Awake or MonoBehaviour.Start.

Из соображений по производительности не рекомендуется использовать эту функцию каждый кадр,

A common pattern is to assign a GameObject to a variable inside MonoBehaviour.Start, and use the variable in MonoBehaviour.Update.

using UnityEngine;
using System.Collections;

// Find the GameObject named Hand and rotate it every frame

public class ExampleClass : MonoBehaviour
{
    private GameObject hand;

    void Start()
    {
        hand = GameObject.Find("/Monster/Arm/Hand");
    }

    void Update()
    {
        hand.transform.Rotate(0, 100 * Time.deltaTime, 0);
    }
}