简单实现无限地图_无限地图unity

无限地图顾名思义就是永远也到达不了终点的地图。但并不意味着要不停的加载生成地图。

可以通过算法实现分块加载地图，并改变地图的位置来实现无限地图。

首先在场景中创建一个空对象。挂上此脚本。

 Player是主角，playerwh和terrainwh是玩家和地图的检查范围，prefab是地图预制体。

代码如下：

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
 
public class TerrainMgr : MonoBehaviour
{
    public GameObject player;
    public float playerWH;
    public float TerrainWH;
    public GameObject prefab;
    Vector3 playerpos;
      GameObject terrain;
    Dictionary<Vector2, GameObject> showDic = new Dictionary<Vector2, GameObject>();
    //对象池
    Queue<GameObject> pool = new Queue<GameObject>();
 
    void Start()
    {
        playerpos = player.transform.position;
        player.transform.position = new Vector3(0.1f, 0, 0);
       
    }
 
    // Update is called once per frame
    void Update()
    {
 
        if (playerpos != player.transform.position)
        {
            List<Vector2> showlist = new List<Vector2>();
 
            Rect playerRect = new Rect(player.transform.position.x, player.transform.position.z, playerWH, playerWH);
 
            int x = (int)(player.transform.position.x / TerrainWH);
            int z = (int)(player.transform.position.z / TerrainWH);
            showlist.Add(new Vector2(x, z));
            if (IsLap(playerRect, new Rect((x + 1) * TerrainWH, z * TerrainWH, TerrainWH, TerrainWH)))
            {
                showlist.Add(new Vector2(x + 1, z));
            }
 
            if (IsLap(playerRect, new Rect((x - 1) * TerrainWH, z * TerrainWH, TerrainWH, TerrainWH)))
            {
                showlist.Add(new Vector2(x - 1, z));
            }
 
            if (IsLap(playerRect, new Rect(x * TerrainWH, (z + 1) * TerrainWH, TerrainWH, TerrainWH)))
            {
                showlist.Add(new Vector2(x, z + 1));
            }
 
            if (IsLap(playerRect, new Rect(x * TerrainWH, (z - 1) * TerrainWH, TerrainWH, TerrainWH)))
            {
                showlist.Add(new Vector2(x, z - 1));
            }
 
            if (IsLap(playerRect, new Rect((x + 1) * TerrainWH, (z + 1) * TerrainWH, TerrainWH, TerrainWH)))
            {
                showlist.Add(new Vector2(x + 1, z + 1));
            }
 
            if (IsLap(playerRect, new Rect((x - 1) * TerrainWH, (z + 1) * TerrainWH, TerrainWH, TerrainWH)))
            {
                showlist.Add(new Vector2(x - 1, z + 1));
            }
 
            if (IsLap(playerRect, new Rect((x + 1) * TerrainWH, (z - 1) * TerrainWH, TerrainWH, TerrainWH)))
            {
                showlist.Add(new Vector2(x + 1, z - 1));
            }
 
            if (IsLap(playerRect, new Rect((x - 1) * TerrainWH, (z - 1) * TerrainWH, TerrainWH, TerrainWH)))
            {
                showlist.Add(new Vector2(x - 1, z - 1));
            }
            
 
            List<Vector2> deslist = new List<Vector2>();
 
            foreach (var item in showDic.Keys)
            {
                if (!showlist.Contains(item))
                {
                    showDic[item].SetActive(false);
                    pool.Enqueue(showDic[item]);
                    deslist.Add(item);
                }
            }
 
            foreach (var item in deslist)
            {
                showDic.Remove(item);
            }
 
            foreach (var item in showlist)
            {
                if (!showDic.ContainsKey(item))
                {
                  
                    if (pool.Count>0)
                    {
                        terrain = pool.Dequeue();
                        terrain.SetActive(true);
                    }
                    else
                    {
                        terrain = Instantiate(prefab);
                    }
                    terrain.transform.position = new Vector3(item.x * TerrainWH, 0, item.y * TerrainWH);
                    showDic.Add(item, terrain);
                }
            }
            playerpos = player.transform.position;
 
        }
 
 
 
    }
 
    public bool IsLap(Rect a, Rect b)
    {
        float aMinX = a.x - a.width / 2;
        float aMaxX = a.x + a.width / 2;
        float aMinZ = a.y - a.height / 2;
        float aMaxZ = a.y + a.height / 2;
 
        float bMinX = b.x - b.width / 2;
        float bMaxX = b.x + b.width / 2;
        float bMinZ = b.y - b.height / 2;
        float bMaxZ = b.y + b.height / 2;
        if (aMinX < bMaxX &&
             bMinX < aMaxX &&
             aMinZ < bMaxZ &&
             bMinZ < aMaxZ
            )
        {
            return true;
 
        }
        else
        {
            return false;
        }
 
 
    }
}