如何在 Unity 中生成不重叠的随机 2D 平台？

Question

I'm looking for a way to randomly spawn platforms that do not overlap with each other. All the tutorials I found on this topic are for an endless runner game type, and my project is not like that. So far I know how to spawn my platforms but I need those gaps between them. I'm a total begginer in Unity and C# so I'm looking for a simple code if possible.

My code now:

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

 public class GameStateManager: MonoBehaviour {
public GameObject YellowPrefab;
    public int howManyYellow;

 void Start()
    { GameObject tmpYellow;

        for (int i = 0; i < howManyYellow; i++)
        {
            tmpYellow = Instantiate(YellowPrefab, new
                        Vector3(Random.Range(-50, 50), Random.Range(-
                        40, -17), 0), Quaternion.identity);
        }
 }

My platforms have box colliders used by platform effector, if that information is needed.

Edit: If possible, it would be nice to be able to set max distance between the random platforms, but if it's something hard to do with that kind of code then it's OK without that:)

Answer 1

Look into Physics2D.OverlapBox() or related functions, depending on your needs. With this you can check if your object's collider is overlapping with any other collider, like so:

for (int i = 0; i < howManyYellow; i++)
{
    tmpYellow = Instantiate(YellowPrefab, 
                            new Vector3(Random.Range(-50, 50), 
                            Random.Range(-40, -17), 0), 
                            Quaternion.identity);

    BoxCollider2D tmpYCollider = tmpYellow.GetComponent<BoxCollider2D>();
    tmpyCollider.enabled = false; // Disable object's own collider to prevent detecting itself

    // while collider overlaps, move your object somewhere else (e.g. 17 units up)
    while (Physics2D.OverlapBox(tmpYCollider.bounds.center, tmpYCollider.size, 0) != null)
    {
        tmpYellow.transform.Translate(new Vector3(0, 17));
        // or do something else
    }

    tmpyCollider.enabled = true; // enable the collider again
}

Answer 2

From what I understand, you want to create a bunch of platforms randomly in the area of (-50,-40) -> (50,-17).

If you do not want a platform to be created in the same spot you need to keep track of the location that all of the platforms were placed in.

public GameObject YellowPrefab;
public int howManyYellow;
private List<Vector3> locations;

void Start()

locations = new List<Vector3>();
{ 
    GameObject tmpYellow;

    for (int i = 0; i < howManyYellow; i++)
    {
        bool hasItem = false;
         Vector3 tempLocation;
        do{
            tempLocation = new Vector3(Random.Range(-50, 50), Random.Range(-40, -17), 0);
            foreach (Vector3 item in locations)
            {
                if(tempLocation == item){

                    hasItem = true;
                }
            }
        } while(hasItem);
        locations.Add(tempLocation);

         tmpYellow = Instantiate(YellowPrefab, tempLocation, Quaternion.identity);
    }
}