How to instantiate a list of game objects multiple times?

Question

I have a method which creates 2d sprites with specific width. After instantiate I add them to the list. I want to have multiple instances of this list. So I am planning to create two extra scripts. One to be responsible for positioning and order of these 2d sprites. (List basically serves as a group) and second for holding all variables.

How to instantiate sprite lists from another script using variables from the third?

I hope it make sense

Thank you very much

Answer 1

Answer by SiniKettu_ · Jun 19, 2020 at 08:49 PM

So you want to create in the scene, at runtime, several sprite prefabs, several times ?

If this is the case, you can use a foreach. If you don't know how to use it : https://docs.microsoft.com/en-ie/dotnet/csharp/language-reference/keywords/foreach-in.

So you can create a bit of code wich, will instantiate every Sprite of your list (you can even set up some "filters" or selection criterias if needed ) and of course you can repeat this foreach with another foreach or with a for

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SiniKettu_ · Jun 19, 2020 at 08:50 PM 0

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If this is exactly what you need, and if you struggle with writing your code I can help you

Answer 2

Thank you. I have a script which creates road as a list from2d sprites. I will also have pavement script which does almost the same.

I want to put all variable for crating these into separate script Specification and create another script which handles positioning of road and pavement.

This is road class

 public class Road : MonoBehaviour
 {
     [SerializeField]
     private StreetSpec newlaneWidth;
 
     //Road control variables
     public bool isRoadOnBothSides;
     public GameObject lanePrefab;
     public float laneWidth;
     public int numberOfLanes;
     private List<GameObject> laneList = new List<GameObject>(); 
     private float laneOffset;
 
    
     //Creates Road form lane objects.
     public List<GameObject> MakeRoad()
     {
         if (laneList.Count < numberOfLanes)
         {
             AddLane();
 
         }
         else if (laneList.Count > numberOfLanes)
         {
             RemoveLane();
         }
 
         ScaleLane(); //scales lane gameobjects in run time
         CheckLanePosition();  // checks and adjust lane position after scale change
 
         return laneList;
 
     }
 
     //Adds lane
     public void AddLane()
     {
         laneOffset = laneWidth * laneList.Count;
         GameObject lane = Instantiate(lanePrefab, new Vector3(laneOffset, 0, 0), Quaternion.identity);
         laneList.Add(lane);
     }
 
     //Scales lane
     public void ScaleLane()
     {
         for (int i = 0; i < laneList.Count; i++)
         {
             laneList[i].transform.localScale = new Vector3(laneWidth, 1, 1);
         }
     }
 
     //Checks lane position
     public void CheckLanePosition()
     {
         for (int i = 0; i < laneList.Count; i++)
         {
             laneList[i].transform.position = new Vector3(laneWidth * i, 0, 0);
         }
     }
 
     //Removes lane
     public void RemoveLane()
     {
         GameObject destroyLane = laneList[laneList.Count - 1];
         laneList.Remove(destroyLane);
         Destroy(destroyLane);
     }
 
 }

And this is generator class:

 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
 
 public class StreetGenerator : MonoBehaviour
 {
 
     Road road; // reference to Road class
 
 
     // Start is called before the first frame update
     void Start()
     {
 
         road = FindObjectOfType<Road>(); // find Road class in the scene
 
     }
 
     // Update is called once per frame
     void Update()
     {
         road.MakeRoad();
     }
 }

I saw a lot of tutorials about managers and player controllers. But they are very specific to games. I am trying to have a set of classes which make staff, a class to hold all variables (so I can use ui to control it) and a class to instantiate all different game objects on the screen in a correct order, size an number using information from variable class.

A very small example will help me understand how to make it will be a great help

Thank you

How to instantiate a list of game objects multiple times?

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