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Question by Warblingpants67 · May 02, 2021 at 10:04 PM · scripting problemgameobjectinstantiateunity 2darray of gameobjects

GameObject wont correctly instantiate into an array

I'm trying to make a script for a chain, which spawns a certain amount of chain links based on a variable in the inspector. I can not figure out why my code will not instantiate more than one link. I have verified that my loop runs the correct number of times when I remove the instantiate line. Here is my code:

 private void Start()
     {
         for (int numOfChainsToSpawn = 0; numOfChainsToSpawn != numOfChains; numOfChainsToSpawn++)
         {
             chains[numOfChainsToSpawn] = Instantiate(chainLink, transform.position, transform.rotation);
         }
     }

Every time I run the Project, it instantiates one link, then I get a nullReference exception. Any ideas on what could be causing this?

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avatar image mishakozlov74 · May 02, 2021 at 10:31 PM 1
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Are you sure that error is related to this specific part of your code? I would assume that your link object has as script component with empty reference. And when in Instantiates, it tries to use it somehow?

avatar image Warblingpants67 mishakozlov74 · May 03, 2021 at 12:38 AM 0
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This is the only piece of code, besides initializing variables. Also, the link object is just a sprite renderer and a hinge joint, no connected scripts. Its really strange that this happens, especially since It does spawn the first one, but none of the others

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Answer by Reid_Taylor · May 03, 2021 at 03:17 PM

Well I see 2 problems. First of all the array needs to be created... At this point the array has no length so when you try to access the array[2], it doesn't exist yet. Second of all you should use < not != in a for loop(kinda personal preference)

 private void Start()
 {
      chains = new "Whatever type chain is"[numOfChains];
      for (int i = 0; i < chains.Length; i++)
      {
           chains[i] = Instantiate(chainLink, transform.position, transform.rotation);
      }
 }
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