NetworkServer.Spawn() make client crash to desktop when called in a loop

Questions & Answers
1

Hi everyone,

In my game, the world is generated server-side, so in my world generation script I have some loops to instantiate prefabs.

The problem is, when I call NetworkServer.Spawn in these loops, it makes the client crash to desktop (even when the client is in the editor). Here is a simple implementation exemple (code is server side) :

void GeneratePlanets()
{
   for (int i = 0; i < planetCount; i++)
   {
      Planet planet = Factory.CreatePlanet();
      NetworkServer.Spawn(planet.gameObject);
   }
}

Here is another implementation I’ve tested :

public class Factory : NetworkBehavior
{
   List<GameObject> instanciatedObjects = new List<GameObject>();

   void Update()
   {
      // Spawn every object instanciated by the server on the last frame
      foreach (var item in instantiatedObjects)
         NetworkServer.Spawn(item);

      instanciatedObjects.Clear();
   }
}

This is an exemple of implementation, I’ve tested many approaches but it fail everytime. Maybe I’ve missed something ?

Thanks in advance.

2

Calling NetworkServer.Spawn inside an Update inside a foreach statement will definitely crash any application.

I HIGHLY recommend changing the Update function to Start or Awake.

Otherwise, my only other assumption is that after you call “instanciatedObjects.Clear()” in Update, the next frame happens and the Update call is trying to loop through the foreach but “instanciatedObjects” no longer has any objects to iterate through.