How to compare if two gameObjects are the same?

Question

I´m trying to make a game about visual memory. Random a game object appears and after 5 seconds disappear and another one appear. The goal is the player select that game object if is equal to the last one. How can i compare the fist game object and the one that players click? Any suggestions???

Thanks

Answer 1

Answer by yacth_Mon · Apr 19, 2017 at 10:17 AM

Use Object.RefrenceEquals(obj1, obj2)

Like this

 if(GameObject.ReferenceEquals( firstGameObject, secondGameObject))
       Debug.Log("first and second are the same");

Also you can use to check if it null ? by changing secondGameObject to null.

Read more about ReferenceEquals

Hope this can help you. :)

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fesul · May 06, 2017 at 10:37 PM 2

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I run the test on all 3 methods and this has been the fastest. $$anonymous$$uch faster than the others.

Answer 2

Answer by 1Benisin · Jun 05, 2015 at 08:23 AM

Use GameObject.GetInstanceID()

 if (firstObj.GetInstanceID() == secondObj.GetInstanceID()) {
             // objects are the same instance
         }

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Afassolas · Feb 28, 2016 at 07:36 AM -2

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Instance IDs are never the same

Ruri-Dev Afassolas · May 06, 2017 at 10:50 PM 2

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They'll be for the same object.

Answer 3

Answer by Kiwasi · Jul 20, 2014 at 08:35 AM

... can't you use

 gameObject == otherGameObject

or am I missing something critical...

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Ruri-Dev · May 06, 2017 at 11:56 PM 0

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I think it's ok, I trust in the GameObject's overriden comparison behaviour.

ytisfu · Apr 12, 2020 at 11:33 PM 0

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I can confirm this DOESN'T work - Unity doesn't recognize them as the same even when they are. In the end I gave the objects unique names and compared them later.

ETGgames ytisfu · May 17, 2020 at 03:11 PM 1

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You are RONG. the == operator is overloaded as such, meaning it correctly compares two objects with ==:

whatsapp-image-2020-05-17-at-160000.jpeg (31.3 kB)

ytisfu ETGgames · May 21 at 03:04 PM 0

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At the end of the day it seems inconsistent whether the '==' is going to give the correct answer.

But comparing 2 different names/strings is a method that works %100 of the time in my experience. So I recommend it.

Mehrdad995 · May 21 at 02:39 PM 0

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It should work, other solutions are for the sake of performance.

Answer 4

Answer by book · Jul 19, 2014 at 11:21 PM

You could maybe give a special name or tag to the different objects.

"Blue" for blue objects and "Red" for red etc.

Then in a script keep storing the name/tag of the last object that was on the screen in a string and then just do a check to see if the last object's tag was the same as the one that the user clicked.

Just an Idea..

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How to compare if two gameObjects are the same?

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