Activating and deactivating gameObjects in unity by C# script

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Sometimes it is very useful to active or deactivate a gameObject by script. For this gameObject class have a called SetActive(). You can pass true or false in to active or deactivate

  • For activating gameObject by script first declare a gameObject and then drag and drop in inspector or use Find method for referencing gameObject.
  • then use gameObject.SetActive(true) when you want to visible (activate) gameObject.SetActive(false) when want to deactivate gameObject.
  • if gameObject is parent object then its all child object will also deactivaate.

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class test : MonoBehaviour
{
    public GameObject my_object;
    // Start is called before the first frame update
    void Start()
    {
      
    }

    void Update()
    {
        if(Input.GetKeyDown(KeyCode.A))
        {
            my_object.SetActive(true);//activate gameObject
        }

        if(Input.GetKeyDown(KeyCode.D))
        {
            my_object.SetActive(false);//deactivate gameObject
        }
    }
}

  • In this example code we have declare a gameObject of name my_object.
  • if we press 'A' key then my_object.SetActive(true); code will execute an active gameObject.
  • and if press 'D' key then my_object.SetActive(true); will deactivate gameObject.
  • You can use these code to your desired gameObject at desire place of code

You can also use array of gameObject for multiple gameObjects to active or deactivate

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class test : MonoBehaviour
{
    public GameObject[] my_object;
    // Start is called before the first frame update
    void Start()
    {
      
    }

    void Update()
    {
        if(Input.GetKeyDown(KeyCode.A))
        {
            for(int i=0;i<my_object.Length;i++)
            {
                my_object[i].SetActive(true);//activate gameObject
            }
        }

        if(Input.GetKeyDown(KeyCode.D))
        {
            for(int i=0;i<my_object.Length;i++)
            {
                my_object[i].SetActive(false);//deactivate gameObject
            }    
        }
    }
}


  • You can declare array of gameObjects and then can activate or deactivate particular or all gameObject with few line of code.