基本上抄的这篇，自己稍微改了一下
https://blog.csdn.net/qq_14903317/article/details/69835578
使用方法：选中地形文件右键。
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEditor;
using System.IO;
public class TerrainSlicing : Editor
{
//分割后存储的位置
public static string TerrainSavePath = "Assets/BigMap/Resources/Map";
//分割份数（必须是2整数幂）
public static int SLICING_NUM = 2;
//检查是否有地形信息
private static TerrainData Check(){
Debug.Log (Selection.activeObject.GetType());
TerrainData mainData = null;
if (Selection.activeObject != null ) {
if (Selection.activeObject.GetType () == typeof(GameObject)) {
var obj = (GameObject)Selection.activeObject;
mainData = obj.GetComponent ().terrainData;
}else if(Selection.activeObject.GetType () == typeof(TerrainData)){
mainData = (TerrainData)Selection.activeObject;
}
if (mainData == null) {
Debug.Log ("没有地形信息");
}
}else {
Debug.Log ("没有地形信息");
}
return mainData;
}
[MenuItem("Assets/TerrainAlignment(地形贴图校准防止有明显切线)")]
private static void Alignment(){
TerrainData mainData = Check ();
if (mainData == null)
return;
var alphamapX = mainData.alphamapWidth / SLICING_NUM;
var alphamapY = mainData.alphamapHeight / SLICING_NUM;
float[,,] alphamaps = mainData.GetAlphamaps (0, 0, mainData.alphamapWidth, mainData.alphamapHeight);
for (int x = 1; x < SLICING_NUM; x++) {
for (int y = 0; y < mainData.alphamapHeight; y++) {
for (int i = 0; i < mainData.splatPrototypes.Length; i++) {
alphamaps [x * alphamapX , y,i] = alphamaps [x * alphamapX- 1, y,i];
}
}
}
for (int y = 1; y < SLICING_NUM; y++) {
for (int x = 0; x < mainData.alphamapWidth; x++) {
for (int i = 0; i < mainData.splatPrototypes.Length; i++) {
alphamaps [x, y * alphamapY,i] = alphamaps [x, y * alphamapY - 1,i];
}
}
}
mainData.SetAlphamaps (0, 0, alphamaps);
}
[MenuItem("Assets/TerrainSlicing(分割地形)")]
private static void Slicing()
{
TerrainData mainData = Check ();
if (mainData != null) {
if (Directory.Exists (TerrainSavePath))
Directory.Delete (TerrainSavePath, true);
Directory.CreateDirectory (TerrainSavePath);
Directory.CreateDirectory (TerrainSavePath + "/TerrainData");
Directory.CreateDirectory (TerrainSavePath + "/Prefab");
//得到新地图 高度和贴图透明度纹理 范围
var alphamapX = mainData.alphamapWidth / SLICING_NUM;
var alphamapY = mainData.alphamapHeight / SLICING_NUM;
var heightX = (mainData.heightmapWidth - 1) / SLICING_NUM;
var heightY = (mainData.heightmapHeight - 1) / SLICING_NUM;
for (int x = 0; x < SLICING_NUM; x++) {
for (int y = 0; y < SLICING_NUM; y++) {
EditorUtility.DisplayProgressBar ("正在分割地形", mainData.name + " " + (x * SLICING_NUM + y) + "/" + (SLICING_NUM * SLICING_NUM), (float)(x * SLICING_NUM + y) / (float)(SLICING_NUM * SLICING_NUM));
var newData = new TerrainData ();
//必须先创建（否则 贴图透明度纹[不知道叫啥] 理无法储存）
AssetDatabase.CreateAsset (newData, string.Format ("{0}/TerrainData/{1}_{2}.asset", TerrainSavePath, x, y));
//赋值一些基本属性
newData.heightmapResolution = (mainData.heightmapResolution - 1) / SLICING_NUM;
newData.alphamapResolution = mainData.alphamapResolution / SLICING_NUM;
newData.baseMapResolution = mainData.baseMapResolution / SLICING_NUM;
newData.size = new Vector3 (mainData.size.x / SLICING_NUM, mainData.size.y, mainData.size.z / SLICING_NUM);
//设置地形原型（原始贴图）
var splatProtos = mainData.splatPrototypes;
SplatPrototype[] newSplats = new SplatPrototype[splatProtos.Length];
for (int i = 0; i < splatProtos.Length; ++i) {
newSplats [i] = new SplatPrototype ();
newSplats [i].texture = splatProtos [i].texture;
newSplats [i].tileSize = splatProtos [i].tileSize;
newSplats [i].normalMap = splatProtos [i].normalMap;
//计算贴图偏移
float offsetX = (newData.size.x * x) % splatProtos [i].tileSize.x + splatProtos [i].tileOffset.x;
float offsetY = (newData.size.z * y) % splatProtos [i].tileSize.y + splatProtos [i].tileOffset.y;
newSplats [i].tileOffset = new Vector2 (offsetX, offsetY);
}
newData.splatPrototypes = newSplats;
//赋值 高度 和 贴图透明度纹理 信息
float[,,] alphamaps = mainData.GetAlphamaps (x * alphamapX, y * alphamapY, alphamapX, alphamapY);
float[,] heights = mainData.GetHeights (x * heightX, y * heightY, heightX + 1, heightY + 1);//+1 防止边界高度为默认值0
newData.SetAlphamaps (0, 0, alphamaps);
newData.SetHeights (0, 0, heights);
//预览
GameObject parent = GameObject.Find ("BigMap");
if (parent == null) {
parent = new GameObject ("BigMap");
}
var name = string.Format ("{0}_{1}", x, y);
GameObject obj = new GameObject (name);
obj.transform.SetParent (parent.transform);
obj.transform.localPosition = new Vector3 (x * newData.size.x, 0, y * newData.size.z);
Terrain terrain = obj.AddComponent ();
terrain.terrainData = newData;
TerrainCollider terrainCollider = obj.AddComponent ();
terrainCollider.terrainData = newData;
//创建预制体
Object prefab = PrefabUtility.CreateEmptyPrefab (string.Format ("{0}/Prefab/{1}_{2}.prefab", TerrainSavePath, x, y));
PrefabUtility.ReplacePrefab (obj, prefab);
}
}
EditorUtility.ClearProgressBar ();
}
}
}
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