How can I instanciate an object when a global variable is modified?

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Hi!

How can I instanciate an object (an empty object with its child objects) when a value of a global variable is reached in Javascript?.

The idea is that this object has an animation as a component object and I want instanciate this object during a short time and after the animation is watched, destroy the instanciated object.

Maybe with coroutines or there's any other easier and/or direct way to implement this?

Thank you very much.

Answer 1

Best Answer

Answer by jorgon · Oct 05, 2011 at 08:31 AM

"mensaje" is the GameObject I want to instanciate. "posicion mensaje" is the empty GameObject used as a position where I want to instantiate my "mensaje" GameObject.

I'm checking 24 times per second if activate is activated and when it's activate I instantiate the object, my "mensaje" GamObject in the desired position.

Well, I can't print any of my messages "bien" or "mal".

I've created first script "global_counter_script" the global variables used in the other two scripts which modify them:

  static var globos_azules_explotados:int=0 ;
  static var globos_rojos_explotados:int=0 ;
  static var globos_amarillos_explotados:int=0 ;
  
  static var goal_azules: boolean;

And in the second script I've modified (incremented) the value of some global variables

  private var globos_rojos_explotados:int ;
  private var globos_amarillos_explotados:int ;
  private var globos_azules_explotados:int ;
  
  private var activate:boolean;

. . .

 //after some instructions:
 if (tipo_globo =="globo_normal_azul(Clone)") 
     {
     print("entro azul");
     Contador_global.globos_azules_explotados++; //acedemos a la variable global que cuenta el número de globos azules explotados
     if (Contador_global.globos_azules_explotados==1)
         {
         print("llegamos_a uno");
         activate=true;
         }
     }

I can print my messages in this, from second script using the global variables as you can watch, but I can't evaluate the global variable in the third script as I've done in the second one.

And this is the script where I want to check the condition based in a global variable created in the first script.

 var mensaje:GameObject;
 var posicion_mensaje: Transform;
 private var activate:boolean=false;
 
 
 function update()

{

  if (activate==true)
     {
     print("bien");
     var go=Instantiate(mensaje, transform.position, transform.rotation);
     }
     else
     {
     print("mal");
     }
 }

Thank you very much in advance.

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syclamoth · Oct 05, 2011 at 08:32 AM 0

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Remember when I told you not to do that?

syclamoth · Oct 05, 2011 at 08:34 AM 0

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Ok, I don't see you incrementing any values anywhere. Are you sure your code does what you think it does? It probably doesn't help that nowhere in your second script do you actually set activate to 'true'. Also, update needs to be Spelled With A Capital U!

jorgon · Oct 05, 2011 at 08:40 AM 0

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The CAPITAL "U" in Update...Oh $$anonymous$$y God...I didn't realise!!...I'm gonna make some checkings...At least I can print "mal" in the script wasn't working well. What I don't know is why Unity didn't tell me anything...AARRGGHH...These are things of being a newbye in Unity3D...But, let give me some $$anonymous$$utes to tell you news.

jorgon · Oct 05, 2011 at 08:50 AM 0

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Ok. You've got all the reason. It still doesn't work due to what you told me : "activate" is never set to "true" because I changed the condition in my third script tu "false" and my object was instanciated continuosly . :-) . So I've got to check why I can't pass perfectly the value of "activate" from the second script to the third one. Another thing will be to set activate to false after the setting of activate to false. Still doesn't work but one of my problems was the CAPITAL "U" of Update...AARRGGHH...How many days spent with this stupid detail...But still doesn't completely work...

jorgon · Oct 05, 2011 at 10:09 AM 0

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It works perfectly: I've added some instructions for resetting the global counter and destroy my instance after a few seconds (the seconds of the duration of my animation associated to my instance). Now I only have to achieve that my instance goes with me meanwhile I'm moving...But...THAN$$anonymous$$ YOU!!. THAN$$anonymous$$ YOU!!. :-) . After some days of hitting my head aginst a wall...Haaahahaha...Now I'm happy!. It's surprising how Unity and the editor recognizes "update" and "Update" coloring the font with blue tint and additionally doesn't tell me any warning...

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Answer 2

Answer by Ludiares.du · Oct 04, 2011 at 06:41 PM

 if(globalvar != lastglobalvarvalue)
 {
      var go = Instantiate(prefab, transform.position, transform.rotation);
     var animationlenght = go.animation.clip.lenght;
     Destroy(go, animationlenght);
 
 }
 lastglobalvarvalue = globalvar;

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jorgon · Oct 04, 2011 at 08:52 PM 0

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$$anonymous$$ore or less this is what I've been trying but: does this must be included inside an update(){} or a start(){} function?.

And one more thing: how do you use "globalvar" when you evaluate the condition?. if(name_of_script_which_contains_the_global_var.globalvar!=lastglobalvarvalue)?. I wanna say :"may I use this way to compare the value of the globalvar (with the dot in the middle)?. I've introduced a print("") to check if I entry inside my if but I can't execute anything inside it. I think that my problem is the syntaxis.

Thank you very much.

syclamoth · Oct 05, 2011 at 07:54 AM 0

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you put in the Update loop, but make sure it only happens when you want it to- you may want to put something in there which resets the global value after doing your animation stuffs.

jorgon · Oct 05, 2011 at 08:05 AM 0

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I'm gonna paste my code because I can't print anything from inside my if...I don't know what's happening. It means that I can't enter in my "if".

syclamoth · Oct 05, 2011 at 08:06 AM 0

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Well, the if will never execute if the condition never evaluates true! $$anonymous$$ake sure you have set up the conditions properly. Also, when you post your code, please update your question- don't post it as a comment or answer.

How can I instanciate an object when a global variable is modified?

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