Unity实现Minecraft(七)——Chunk脚本
前言：前面一篇文章我们实现了ChunkRenderer脚本，主要是根据MeshData实现渲染。但是我们目前还没有任何一个类去填充MeshData(即MeshData的顶点List，三角形List等还没有数据)。所以我们将会在BlockHelper中进行MeshData的填充(因为BlockHelper是细化到Chunk中每个Block的每个面)，而今天要写的Chunk脚本更像是一个辅助类去提供一些便利的方法供BlockHelper调用以便更好在Chunk内遍历时填充数据。using System;
using UnityEngine;
public static class Chunk
{
//遍历一个Chunk中的所有Block
public static void LoopThroughTheBlocks(ChunkData chunkData, Action<int, int, int>
actionToPerform)
{
for (int index = 0; index < chunkData.blocks.Length; index++)
{
var position = GetPostitionFromIndex(chunkData, index);
actionToPerform(position.x, position.y, position.z);//对方块进行的改变
}
}
//一个根据block数组的index可以计算出相应block的(x,y,z)位置的算法(来源于StackOverFlow)
/* int zDirection=i%zLength;
int yDirection=(i/zLength)%yLength;
int xDirection=i/(ylength*zLength);
*/
//根据Block的位置得到在Block数组中的位置
private static Vector3Int GetPostitionFromIndex(ChunkData chunkData, int index)
{
int x = index % chunkData.chunkSize;
int y = (index / chunkData.chunkSize) % chunkData.chunkHeight;
int z = index / (chunkData.chunkSize * chunkData.chunkHeight);
return new Vector3Int(x, y, z);
}
//在Chunk坐标系下
//判断Block是否超出所属Chunk的界限
private static bool InRange(ChunkData chunkData, int axisCoordinate)
{
if (axisCoordinate < 0 || axisCoordinate >= chunkData.chunkSize)
return false;
return true;
}
//同上
private static bool InRangeHeight(ChunkData chunkData, int ycoordinate)
{
if (ycoordinate < 0 || ycoordinate >= chunkData.chunkHeight)
return false;
return true;
}
//根据Chunk坐标系的坐标得出该Block的类型
public static BlockType GetBlockFromChunkCoordinates(ChunkData chunkData, Vector3Int chunkCoordinates)
Vector3Int chunkCoordinates)
{
return GetBlockFromChunkCoordinates(chunkData, chunkCoordinates.x, chunkCoordinates.y,chunkCoordinates.z);
chunkCoordinates.z);
}
public static BlockType GetBlockFromChunkCoordinates(ChunkData chunkData, int x, int y, int z)
{
if (InRange(chunkData, x) && InRangeHeight(chunkData, y) && InRange(chunkData, z))
{
int index = GetIndexFromPosition(chunkData, x, y, z);
return chunkData.blocks;
}
return chunkData.worldReference.GetBlockFromChunkCoordinates(chunkData, chunkData.worldPosition.x + x, chunkData.worldPosition.y + y, chunkData.worldPosition.z + z);
}
//设置Block的类型
public static void SetBlock(ChunkData chunkData, Vector3Int localPosition, BlockType block)
{
if (InRange(chunkData, localPosition.x) && InRangeHeight(chunkData, localPosition.y) && InRange(chunkData, localPosition.z))
{
int index = GetIndexFromPosition(chunkData, localPosition.x, localPosition.y, localPosition.z);
chunkData.blocks = block;
}
else
{
throw new Exception(&#34;Need to ask World for appropiate chunk&#34;);
}
}
//从一个Block的坐标得到在数组中的位置
/*i (x,y,z)
0 (0,0,0)
1 (0,0,1)
2 (0,0,2)
3 (0,1,0)
4 (0,1,1)
5 (0,1,2)
6 (0,2,0)
......
19 (2,0,1)
26 (2,2,2)
i=z+y*ZSize+x*ZSize*YSize*/
private static int GetIndexFromPosition(ChunkData chunkData, int x, int y, int z)
{
return x + chunkData.chunkSize * y + chunkData.chunkSize * chunkData.chunkHeight * z;
}
//根据Chunk坐标系的坐标得到对应的Block
public static Vector3Int GetBlockInChunkCoordinates(ChunkData chunkData, Vector3Int pos)
{
return new Vector3Int
{
x = pos.x - chunkData.worldPosition.x,
y = pos.y - chunkData.worldPosition.y,
z = pos.z - chunkData.worldPosition.z
};
}
//获得MeshData的方法
public static MeshData GetChunkMeshData(ChunkData chunkData)
{
MeshData meshData = new MeshData(true);
LoopThroughTheBlocks(chunkData, (x, y, z) => meshData = BlockHelper.GetMeshData(chunkData, x, y, z, meshData, chunkData.blocks));
return meshData;
}
internal static Vector3Int ChunkPositionFromBlockCoords(World world, int x, int y, int z)
{
Vector3Int pos = new Vector3Int
{
x = Mathf.FloorToInt(x / (float)world.chunkSize) * world.chunkSize,
y = Mathf.FloorToInt(y / (float)world.chunkHeight) * world.chunkHeight,
z = Mathf.FloorToInt(z / (float)world.chunkSize) * world.chunkSize
};
return pos;
}
}
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