【Unity3D】Unity3D开发《我的世界》之五、创建无限地形（视频）

转载请注明出处：http://www.cnblogs.com/shamoyuu/p/unity_minecraft_05.html

一、导入Unity3D自带的第一人称角色控制器

直接导入就行，我们用FPSController。

二、为Map添加创建Chunk和判断Chunk是否存在的方法

using Soultia.Util;
using System.Collections;
using System.Collections.Generic;
using UnityEngine;

namespace Soultia.Voxel
{
    public class Map : MonoBehaviour
    {
        public static Map instance;

        public static GameObject chunkPrefab;
        
        public Dictionary<Vector3i, GameObject> chunks = new Dictionary<Vector3i, GameObject>();


        //当前是否正在生成Chunk
        private bool spawningChunk = false;

        void Awake()
        {
            instance = this;
            chunkPrefab = Resources.Load("Prefab/Chunk") as GameObject;
        }

        //生成Chunk
        public void CreateChunk(Vector3i pos)
        {
            if (spawningChunk) return;

            StartCoroutine(SpawnChunk(pos));
        }

        private IEnumerator SpawnChunk(Vector3i pos)
        {
            spawningChunk = true;
            Instantiate(chunkPrefab, pos, Quaternion.identity);
            yield return null;
            spawningChunk = false;
        }

        //通过Chunk的坐标来判断它是否存在
        public bool ChunkExists(Vector3i worldPosition)
        {
            return this.ChunkExists(worldPosition.x, worldPosition.y, worldPosition.z);
        }
        //通过Chunk的坐标来判断它是否存在
        public bool ChunkExists(int x, int y, int z)
        {
            return chunks.ContainsKey(new Vector3i(x, y, z));
        }
    }
}

上上一章用来测试的Start方法也删掉了，我们下面会通过玩家的位置来生成

三、添加草方块

using System.Collections.Generic;
using UnityEngine;

/// <summary>
/// 存储所有的Block对象的信息
/// </summary>
public class BlockList : MonoBehaviour
{
    public static Dictionary<byte, Block> blocks = new Dictionary<byte, Block>();

    void Awake()
    {
        Block dirt = new Block(1, "Dirt", 2, 31);
        blocks.Add(dirt.id, dirt);

        Block grass = new Block(2, "Grass", 3, 31, 0, 31, 2, 31);
        blocks.Add(grass.id, grass);
    }

    public static Block GetBlock(byte id)
    {
        return blocks.ContainsKey(id) ? blocks[id] : null;
    }
}

四、修改Chunk

using Soultia.Util;
using System.Collections;
using System.Collections.Generic;
using System.Runtime.CompilerServices;
using UnityEngine;

namespace Soultia.Voxel
{
    [RequireComponent(typeof(MeshFilter))]
    [RequireComponent(typeof(MeshRenderer))]
    [RequireComponent(typeof(MeshCollider))]
    public class Chunk : MonoBehaviour
    {
        public static int width = 16;
        public static int height = 16;

        public byte[,,] blocks;
        public Vector3i position;

        private Mesh mesh;

        //面需要的点
        private List<Vector3> vertices = new List<Vector3>();
        //生成三边面时用到的vertices的index
        private List<int> triangles = new List<int>();
        //所有的uv信息
        private List<Vector2> uv = new List<Vector2>();
        //uv贴图每行每列的宽度(0~1)，这里我的贴图是32×32的，所以是1/32
        public static float textureOffset = 1 / 32f;
        //让UV稍微缩小一点，避免出现它旁边的贴图
        public static float shrinkSize = 0.001f;


        //当前Chunk是否正在生成中
        private bool isWorking = false;

        void Start()
        {
            position = new Vector3i(this.transform.position);
            if (Map.instance.ChunkExists(position))
            {
                Debug.Log("此方块已存在" + position);
                Destroy(this);
            }
            else
            {
                Map.instance.chunks.Add(position, this.gameObject);
                this.name = "(" + position.x + "," + position.y + "," + position.z + ")";
                StartFunction();
            }
        }


        void StartFunction()
        {
            mesh = new Mesh();
            mesh.name = "Chunk";

            StartCoroutine(CreateMap());
        }

        IEnumerator CreateMap()
        {
            while (isWorking)
            {
                yield return null;
            }
            isWorking = true;
            blocks = new byte[width, height, width];
            for (int x = 0; x < Chunk.width; x++)
            {
                for (int y = 0; y < Chunk.height; y++)
                {
                    for (int z = 0; z < Chunk.width; z++)
                    {
                        if (y == Chunk.height - 1)
                        {
                            if (Random.Range(1, 5) == 1)
                            {
                                blocks[x, y, z] = 2;
                            }
                        }
                        else
                        {
                            blocks[x, y, z] = 1;
                        }
                    }
                }
            }

            StartCoroutine(CreateMesh());
        }

        IEnumerator CreateMesh()
        {
            vertices.Clear();
            triangles.Clear();

            //把所有面的点和面的索引添加进去
            for (int x = 0; x < Chunk.width; x++)
            {
                for (int y = 0; y < Chunk.height; y++)
                {
                    for (int z = 0; z < Chunk.width; z++)
                    {
                        //获取当前坐标的Block对象
                        Block block = BlockList.GetBlock(this.blocks[x, y, z]);
                        if (block == null) continue;

                        if (IsBlockTransparent(x + 1, y, z))
                        {
                            AddFrontFace(x, y, z, block);
                        }
                        if (IsBlockTransparent(x - 1, y, z))
                        {
                            AddBackFace(x, y, z, block);
                        }
                        if (IsBlockTransparent(x, y, z + 1))
                        {
                            AddRightFace(x, y, z, block);
                        }
                        if (IsBlockTransparent(x, y, z - 1))
                        {
                            AddLeftFace(x, y, z, block);
                        }
                        if (IsBlockTransparent(x, y + 1, z))
                        {
                            AddTopFace(x, y, z, block);
                        }
                        if (IsBlockTransparent(x, y - 1, z))
                        {
                            AddBottomFace(x, y, z, block);
                        }
                    }
                }
            }


            //为点和index赋值
            mesh.vertices = vertices.ToArray();
            mesh.triangles = triangles.ToArray();
            mesh.uv = uv.ToArray();

            //重新计算顶点和法线
            mesh.RecalculateBounds();
            mesh.RecalculateNormals();

            //将生成好的面赋值给组件
            this.GetComponent<MeshFilter>().mesh = mesh;
            this.GetComponent<MeshCollider>().sharedMesh = mesh;

            yield return null;
            isWorking = false;
        }

        //此坐标方块是否透明，Chunk中的局部坐标
        public bool IsBlockTransparent(int x, int y, int z)
        {
            if (x >= width || y >= height || z >= width || x < 0 || y < 0 || z < 0)
            {
                return true;
            }
            else
            {
                //如果当前方块的id是0，那的确是透明的
                return this.blocks[x, y, z] == 0;
            }
        }


        
        //前面
        void AddFrontFace(int x, int y, int z, Block block)
        {
            //第一个三角面
            triangles.Add(0 + vertices.Count);
            triangles.Add(3 + vertices.Count);
            triangles.Add(2 + vertices.Count);

            //第二个三角面
            triangles.Add(2 + vertices.Count);
            triangles.Add(1 + vertices.Count);
            triangles.Add(0 + vertices.Count);


            //添加4个点
            vertices.Add(new Vector3(0 + x, 0 + y, 0 + z));
            vertices.Add(new Vector3(0 + x, 0 + y, 1 + z));
            vertices.Add(new Vector3(0 + x, 1 + y, 1 + z));
            vertices.Add(new Vector3(0 + x, 1 + y, 0 + z));

            //添加UV坐标点，跟上面4个点循环的顺序一致
            uv.Add(new Vector2(block.textureFrontX * textureOffset, block.textureFrontY * textureOffset) + new Vector2(shrinkSize, shrinkSize));
            uv.Add(new Vector2(block.textureFrontX * textureOffset + textureOffset, block.textureFrontY * textureOffset) + new Vector2(-shrinkSize, shrinkSize));
            uv.Add(new Vector2(block.textureFrontX * textureOffset + textureOffset, block.textureFrontY * textureOffset + textureOffset) + new Vector2(-shrinkSize, -shrinkSize));
            uv.Add(new Vector2(block.textureFrontX * textureOffset, block.textureFrontY * textureOffset + textureOffset) + new Vector2(shrinkSize, -shrinkSize));
        }

        //背面
        void AddBackFace(int x, int y, int z, Block block)
        {
            //第一个三角面
            triangles.Add(0 + vertices.Count);
            triangles.Add(3 + vertices.Count);
            triangles.Add(2 + vertices.Count);

            //第二个三角面
            triangles.Add(2 + vertices.Count);
            triangles.Add(1 + vertices.Count);
            triangles.Add(0 + vertices.Count);


            //添加4个点
            vertices.Add(new Vector3(-1 + x, 0 + y, 1 + z));
            vertices.Add(new Vector3(-1 + x, 0 + y, 0 + z));
            vertices.Add(new Vector3(-1 + x, 1 + y, 0 + z));
            vertices.Add(new Vector3(-1 + x, 1 + y, 1 + z));

            //添加UV坐标点，跟上面4个点循环的顺序一致
            uv.Add(new Vector2(block.textureBackX * textureOffset, block.textureBackY * textureOffset) + new Vector2(shrinkSize, shrinkSize));
            uv.Add(new Vector2(block.textureBackX * textureOffset + textureOffset, block.textureBackY * textureOffset) + new Vector2(-shrinkSize, shrinkSize));
            uv.Add(new Vector2(block.textureBackX * textureOffset + textureOffset, block.textureBackY * textureOffset + textureOffset) + new Vector2(-shrinkSize, -shrinkSize));
            uv.Add(new Vector2(block.textureBackX * textureOffset, block.textureBackY * textureOffset + textureOffset) + new Vector2(shrinkSize, -shrinkSize));
        }

        //右面
        void AddRightFace(int x, int y, int z, Block block)
        {
            //第一个三角面
            triangles.Add(0 + vertices.Count);
            triangles.Add(3 + vertices.Count);
            triangles.Add(2 + vertices.Count);

            //第二个三角面
            triangles.Add(2 + vertices.Count);
            triangles.Add(1 + vertices.Count);
            triangles.Add(0 + vertices.Count);


            //添加4个点
            vertices.Add(new Vector3(0 + x, 0 + y, 1 + z));
            vertices.Add(new Vector3(-1 + x, 0 + y, 1 + z));
            vertices.Add(new Vector3(-1 + x, 1 + y, 1 + z));
            vertices.Add(new Vector3(0 + x, 1 + y, 1 + z));

            //添加UV坐标点，跟上面4个点循环的顺序一致
            uv.Add(new Vector2(block.textureRightX * textureOffset, block.textureRightY * textureOffset) + new Vector2(shrinkSize, shrinkSize));
            uv.Add(new Vector2(block.textureRightX * textureOffset + textureOffset, block.textureRightY * textureOffset) + new Vector2(-shrinkSize, shrinkSize));
            uv.Add(new Vector2(block.textureRightX * textureOffset + textureOffset, block.textureRightY * textureOffset + textureOffset) + new Vector2(-shrinkSize, -shrinkSize));
            uv.Add(new Vector2(block.textureRightX * textureOffset, block.textureRightY * textureOffset + textureOffset) + new Vector2(shrinkSize, -shrinkSize));
        }

        //左面
        void AddLeftFace(int x, int y, int z, Block block)
        {
            //第一个三角面
            triangles.Add(0 + vertices.Count);
            triangles.Add(3 + vertices.Count);
            triangles.Add(2 + vertices.Count);

            //第二个三角面
            triangles.Add(2 + vertices.Count);
            triangles.Add(1 + vertices.Count);
            triangles.Add(0 + vertices.Count);


            //添加4个点
            vertices.Add(new Vector3(-1 + x, 0 + y, 0 + z));
            vertices.Add(new Vector3(0 + x, 0 + y, 0 + z));
            vertices.Add(new Vector3(0 + x, 1 + y, 0 + z));
            vertices.Add(new Vector3(-1 + x, 1 + y, 0 + z));

            //添加UV坐标点，跟上面4个点循环的顺序一致
            uv.Add(new Vector2(block.textureLeftX * textureOffset, block.textureLeftY * textureOffset) + new Vector2(shrinkSize, shrinkSize));
            uv.Add(new Vector2(block.textureLeftX * textureOffset + textureOffset, block.textureLeftY * textureOffset) + new Vector2(-shrinkSize, shrinkSize));
            uv.Add(new Vector2(block.textureLeftX * textureOffset + textureOffset, block.textureLeftY * textureOffset + textureOffset) + new Vector2(-shrinkSize, -shrinkSize));
            uv.Add(new Vector2(block.textureLeftX * textureOffset, block.textureLeftY * textureOffset + textureOffset) + new Vector2(shrinkSize, -shrinkSize));
        }

        //上面
        void AddTopFace(int x, int y, int z, Block block)
        {
            //第一个三角面
            triangles.Add(1 + vertices.Count);
            triangles.Add(0 + vertices.Count);
            triangles.Add(3 + vertices.Count);

            //第二个三角面
            triangles.Add(3 + vertices.Count);
            triangles.Add(2 + vertices.Count);
            triangles.Add(1 + vertices.Count);


            //添加4个点
            vertices.Add(new Vector3(0 + x, 1 + y, 0 + z));
            vertices.Add(new Vector3(0 + x, 1 + y, 1 + z));
            vertices.Add(new Vector3(-1 + x, 1 + y, 1 + z));
            vertices.Add(new Vector3(-1 + x, 1 + y, 0 + z));

            //添加UV坐标点，跟上面4个点循环的顺序一致
            uv.Add(new Vector2(block.textureTopX * textureOffset, block.textureTopY * textureOffset) + new Vector2(shrinkSize, shrinkSize));
            uv.Add(new Vector2(block.textureTopX * textureOffset + textureOffset, block.textureTopY * textureOffset) + new Vector2(-shrinkSize, shrinkSize));
            uv.Add(new Vector2(block.textureTopX * textureOffset + textureOffset, block.textureTopY * textureOffset + textureOffset) + new Vector2(-shrinkSize, -shrinkSize));
            uv.Add(new Vector2(block.textureTopX * textureOffset, block.textureTopY * textureOffset + textureOffset) + new Vector2(shrinkSize, -shrinkSize));
        }

        //下面
        void AddBottomFace(int x, int y, int z, Block block)
        {
            //第一个三角面
            triangles.Add(1 + vertices.Count);
            triangles.Add(0 + vertices.Count);
            triangles.Add(3 + vertices.Count);

            //第二个三角面
            triangles.Add(3 + vertices.Count);
            triangles.Add(2 + vertices.Count);
            triangles.Add(1 + vertices.Count);


            //添加4个点
            vertices.Add(new Vector3(-1 + x, 0 + y, 0 + z));
            vertices.Add(new Vector3(-1 + x, 0 + y, 1 + z));
            vertices.Add(new Vector3(0 + x, 0 + y, 1 + z));
            vertices.Add(new Vector3(0 + x, 0 + y, 0 + z));

            //添加UV坐标点，跟上面4个点循环的顺序一致
            uv.Add(new Vector2(block.textureBottomX * textureOffset, block.textureBottomY * textureOffset) + new Vector2(shrinkSize, shrinkSize));
            uv.Add(new Vector2(block.textureBottomX * textureOffset + textureOffset, block.textureBottomY * textureOffset) + new Vector2(-shrinkSize, shrinkSize));
            uv.Add(new Vector2(block.textureBottomX * textureOffset + textureOffset, block.textureBottomY * textureOffset + textureOffset) + new Vector2(-shrinkSize, -shrinkSize));
            uv.Add(new Vector2(block.textureBottomX * textureOffset, block.textureBottomY * textureOffset + textureOffset) + new Vector2(shrinkSize, -shrinkSize));
        }
    }
}

我们修改了Chunk的CreateMap方法，让它在最顶部有一定几率生成草方块，便于我们直观地看到无限地形的生成。

然后修改了Start方法，判断了它是否存在，如果不存在，就把它添加到Map的chunks里，如果已经存在了，就销毁它。

五、添加PlayerController

这个对象就是用来检测玩家周围一定范围内的Chunk是否已经生成，如果没有生成就会生成它。

using Soultia.Util;
using Soultia.Voxel;
using UnityEngine;

public class PlayerController : MonoBehaviour
{
    //视线范围
    public int viewRange = 30;


    void Update()
    {
        for (float x = transform.position.x - Chunk.width * 3; x < transform.position.x + Chunk.width * 3; x += Chunk.width)
        {
            for (float z = transform.position.z - Chunk.width * 3; z < transform.position.z + Chunk.width * 3; z += Chunk.width)
            {
                int xx = Chunk.width * Mathf.FloorToInt(x / Chunk.width);
                int zz = Chunk.width * Mathf.FloorToInt(z / Chunk.width);
                if (!Map.instance.ChunkExists(xx, 0, zz))
                {
                    Map.instance.CreateChunk(new Vector3i(xx, 0, zz));
                }
            }
        }
    }
}

然后把它拖给玩家

到这里就已经可以生成无限地形了，按住Shift一直跑，已经可以当成小小的跑酷游戏玩了~