【Unity3D】Unity3D开发《我的世界》之六、创建地形（视频 + 源码）

转载请注明出处：http://www.cnblogs.com/shamoyuu/p/unity_minecraft_06.html

一、引入LibNoise

虽然Unity3D里也有一个Mathf.PerlinNoise，但是只能是2D的，这个可以生成3D的柏林噪音

https://github.com/ricardojmendez/LibNoise.Unity

二、创建GameManager对象

这个对象很简单，就是用来管理随机数种子

using System;
using UnityEngine;

public class GameManager : MonoBehaviour
{
    public static int randomSeed;

    void Awake()
    {
        //让默认的随机数种子为当前的时间戳
        TimeSpan timeSpan = DateTime.UtcNow - new DateTime(1970, 1, 1, 0, 0, 0, 0);
        randomSeed = (int)timeSpan.TotalSeconds;
    }
}

三、创建Terrain对象

这个对象就是负责生成地形的，我们这里只是简单地通过世界坐标来获取一个噪音的值，然后通过这个值判断这个坐标上是什么方块。

using LibNoise;
using LibNoise.Generator;
using Soultia.Util;
using UnityEngine;

public class Terrain : MonoBehaviour
{
    //通过方块的世界坐标获取它的方块类型
    public static byte GetTerrainBlock(Vector3i worldPosition)
    {
        //LibNoise噪音对象
        Perlin noise = new LibNoise.Generator.Perlin(1f, 1f, 1f, 8, GameManager.randomSeed, QualityMode.High);

        //为随机数指定种子，这样每次随机的都是同样的值
        Random.InitState(GameManager.randomSeed);
        //因为柏林噪音在(0,0)点是上下左右对称的，所以我们设置一个很远很远的地方作为新的(0,0)点
        Vector3 offset = new Vector3(Random.value * 100000, Random.value * 100000, Random.value * 100000);

        float noiseX = Mathf.Abs((worldPosition.x + offset.x) / 20);
        float noiseY = Mathf.Abs((worldPosition.y + offset.y) / 20);
        float noiseZ = Mathf.Abs((worldPosition.z + offset.z) / 20);
        double noiseValue = noise.GetValue(noiseX, noiseY, noiseZ);

        noiseValue += (20 - worldPosition.y) / 15f;
        noiseValue /= worldPosition.y / 5f;

        if (noiseValue > 0.5f)
        {
            return 1;
        }

        return 0;
    }
}

四、修改PlayerController，添加Y轴的Chunk生成

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 y = transform.position.y - Chunk.height * 3; y < transform.position.y + Chunk.height * 3; y += Chunk.height)
            {
                //Y轴上是允许最大16个Chunk，方块高度最大是256
                if (y <= Chunk.height * 16 && y > 0)
                {
                    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 yy = Chunk.height * Mathf.FloorToInt(y / Chunk.height);
                        int zz = Chunk.width * Mathf.FloorToInt(z / Chunk.width);
                        if (!Map.instance.ChunkExists(xx, yy, zz))
                        {
                            Map.instance.CreateChunk(new Vector3i(xx, yy, zz));
                        }
                    }
                }
            }
        }
    }
}

五、修改Chunk对象

1.修改CreateMap方法来通过噪音生成地形

2.修改Chunk生成地形的方法

using Soultia.Util;
using System.Collections;
using System.Collections.Generic;
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
        public static bool isWorking = false;
        private bool isFinished = 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 Update()
        {
            if (isWorking == false && isFinished == false)
            {
                isFinished = true;
                StartFunction();
            }
        }


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

            StartCoroutine(CreateMap());
        }

        IEnumerator CreateMap()
        {
            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++)
                    {
                        byte blockid = Terrain.GetTerrainBlock(new Vector3i(x, y, z) + position);
                        if (blockid == 1 && Terrain.GetTerrainBlock(new Vector3i(x, y + 1, z) + position) == 0)
                        {
                            blocks[x, y, z] = 2;
                        }
                        else
                        {
                            blocks[x, y, z] = Terrain.GetTerrainBlock(new Vector3i(x, y, z) + position);
                        }
                    }
                }
            }

            yield return null;
            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));
        }
    }
}

源码下载地址

链接: https://pan.baidu.com/s/1o8uqNY6
密码: hgar

---

放置和破坏方块是比较简单的，算是留给读者的一个小作业吧，如果你理解了我这整个系列教程中每一个知识点的话。提示：改变Chunk中blocks的值，然后重新绘制。

 

至此，我们Unity3D开发《我的世界》的教程就到此结束了。

但是我们离《我的世界》还差得很远很远很远很远。。。。。

《我的世界》中的五大难点

1.方块构成地形

2.通过生态构成自然的地形

3.液体

4.光照

5.红石电路

我们只勉勉强强完成了1，其他4个每一个都是极大的挑战，如果读者感兴趣，可以自己试一下。

《我的世界》这么火，真的不无道理。

 

完结，散花