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Question by flamencobusiness · Nov 21, 2019 at 07:55 PM · variableslists

Why does my LIST is empty at play time

I wrote a script to place and remove cars in my city (this is done in the Editor). One method for each thing.

It works fine if I do not enter play mode. You can see how it works here.

The problem comes when I place the cars and then I enter play mode. The list gets cleared and loses its items (the instantiated cars), so I cannot delete them. You can see it here.

So, basically I have an array called carBuffer that stores the prefabs of cars I want to instantiate, decide how many I want to place (numberOfCars) and I iterate that many times, instantiating cars:

 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
 using UnityEditor;
 using PathCreation;
 
 public class VehicleManager : MonoBehaviour
 {
     public PathCreator pathcreator;
     public float VehicleSpeed = 50f;
     public int carOffset = 200;
     
     [Range(1, 200)]
     public int numberOfCars;
     
     public GameObject[] carBuffer;
 
     [SerializeField]
     List<GameObject> ListOfCars;
 
     int carPosIterator = 0;
 
     public void placecars()
     {
         for (int i = 0; i < numberOfCars; i++)
         {
             ListOfCars.Add(Instantiate(carBuffer[Random.Range(0, (carBuffer.Length))], pathcreator.path.GetPointAtDistance(carPosIterator), pathcreator.path.GetRotationAtDistance(carPosIterator), this.transform));
             ListOfCars[i].GetComponent<CivillianCar>().distanceTravelled = carPosIterator;
             ListOfCars[i].GetComponent<CivillianCar>().pathcreator = pathcreator;
             ListOfCars[i].GetComponent<CivillianCar>().carVelocity = VehicleSpeed;
 
             carPosIterator += carOffset;
         }
         carPosIterator = 0;
     }
     
     public void CleanCars()
     {
         if (ListOfCars.Count>0)
         {
             for (int i = 0; i < numberOfCars; i++)
             {
                 DestroyImmediate(ListOfCars[i]);
             }
         }
         ListOfCars.Clear();
     }
 }

Why does my List clear at playmode?

PS: the methods are being called from two editor buttons I wrote for this script.

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avatar image LeonmFF · Apr 28, 2021 at 01:31 PM 0
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And after a few year I have the same problem... Too bad no one answered. I believe that there's something to do with those editor buttons as I also use them and create the list by them.

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