Execute Code When Component Added

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I have a script that generates a simple mesh in a function called Rebuild(). Normally this function is called whenever Radius changes in the GUI. However, it doesn't get called when I first add the script/component to the a game object. What's the best way of doing this? I basically want to execute code on a component when it's added to a game object.

Thanks

Answer 1

Best Answer

Answer by fotaras · Jun 14, 2015 at 04:50 PM

The best way of doing that is using the reset

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joonturbo · Jul 24, 2015 at 09:56 AM 1

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this is the correct answer

aeroson · Jan 02, 2016 at 01:34 AM 0

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for google: $$anonymous$$onoBehaviour void Reset() is basically Unity's on component added (onadded component) event (hook)

Justinas_Ma · Jul 27, 2017 at 05:24 AM 0

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Best solution! Unlike others, this one gets called if you attach a component on a disabled game object.

IgorAherne · Jul 02, 2018 at 09:29 PM 0

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Reset is not called when you ctrl+D an object, if that's something that you need (like assigning an internal ID). See my answer below if required.

Answer 2

Answer by ConfucianFighter · May 03, 2016 at 06:24 PM

void Reset() is called on a monobehaviour in edit mode when it is first added.

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AgentFire · Aug 12, 2016 at 12:51 PM 0

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The best answer here.

Answer 3

Answer by graham · Apr 13, 2012 at 08:32 AM

Thanks for the help mirswith, but I couldn't find what I needed directly. In the end, I used the ExecuteInEditMode attribute on my MonoBehaviour, and combined that with a flag that I check on Update. If the flag is set, I do what I need. Not the most optimal solution, but it seems to work and is simple.

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Glurth · Feb 26, 2015 at 08:04 PM 0

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I created a class to derive from, based on your suggestion. The only thing I don't like about it is that any derived classes are ALSO subject to [ExecuteInEdit$$anonymous$$ode]. Usage: Override FirstPassFunction() with desired "OnCreation" behavior.

 using UnityEngine;
 
 [ExecuteInEdit$$anonymous$$ode]
 public class FirstPass$$anonymous$$onoBehaviour : $$anonymous$$onoBehaviour {
     
     [SerializeField][HideInInspector]
     private bool firstPassFlag=true;
 
     void Awake()
     {        
         if (firstPassFlag)
         {
             firstPassFlag = false;
             FirstPassFunction();
         }
     }
 
     protected virtual void FirstPassFunction()
     {
     }
 }

Answer 4

Answer by mirswith · Apr 04, 2012 at 10:42 PM

Take a look at MonoBehaviour and determine which event best fits your needs; Awake() maybe.

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Answer 5

Answer by bloodthirst69 · Mar 17 at 01:25 PM

Use the "componentWasAdded" editor callback , here's an example i posted where it's being used

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Execute Code When Component Added

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