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TexturePacker是一款非常牛逼的打图集软件，是一款收费软件。这是它的官网：https://www.codeandweb.com/texturepacker，大家可以下到最新版本。即便如此，网上还是有很多破解版的（虽然不是最新版的），但是已经够用了。
其实Unity本身也有图集打包功能，但Unity并不想让开发者知道图集这个概念。开发的过程中，如果你不想知道图集的存在，Unity完全可以帮你隐藏得很深，但其实它还在帮你打图集。对于这种打图集方式，我很不放心。我还是想像传统那样的自己打图集，并且能看到打好的图集在哪里，长什么样，但又能被Unity所识别，即在Unity里能用。那TP就可以派上用场了。这是我用的3.0.3版本的TP。大家可以到这里下载
：http://pan.baidu.com/s/1bgjlHs。关于TP的用法，本文并不做介绍。本文要做的就是利用TP的命令行来实现完全自动化的图集打包。
打开命令行工具并CD到TexturePacker的安装目录，输入 TexturePacker –help,会出现该版本的TP的一些命令行参数。
下面我们写代码来用上这些命令行参数。写代码之前先看看我们要打成图集的小图们：
好的，上代码：
#if UNITY_EDITOR
using UnityEngine;
using System.IO;
using UnityEditor;
using System.Text;
using System.Diagnostics;
public class CommandBuild : Editor
{[MenuItem("Tools/SpritesPacker/CommandBuild")]public static void BuildTexturePacker(){//选择并设置TP命令行的参数和参数值string commandText = " --sheet {0}.png --data {1}.xml --format sparrow --trim-mode None --pack-mode Best --algorithm MaxRects --max-size 2048 --size-constraints POT --disable-rotation --scale 1 {2}" ;string inputPath = string.Format ("{0}/Images", Application.dataPath);//小图目录string outputPath = string.Format ("{0}/TexturePacker", Application.dataPath);//用TP打包好的图集存放目录string[] imagePath = Directory.GetDirectories (inputPath); for (int i = 0; i < imagePath.Length; i++) {UnityEngine.Debug.Log (imagePath [i]);StringBuilder sb = new StringBuilder("");string[] fileName = Directory.GetFiles(imagePath[i]);for (int j = 0; j < fileName.Length; j++){string extenstion = Path.GetExtension(fileName[j]);if (extenstion == ".png"){sb.Append(fileName[j]);sb.Append(" ");}UnityEngine.Debug.Log("fileName [j]:" + fileName[j]);}string name = Path.GetFileName(imagePath [i]);string outputName = string.Format ("{0}/TexturePacker/{1}/{2}", Application.dataPath,name,name);string sheetName = string.Format("{0}/SheetsByTP/{1}", Application.dataPath, name);//执行命令行processCommand("D:\\Program Files (x86)\\CodeAndWeb\\TexturePacker\\bin\\TexturePacker.exe", string.Format(commandText, sheetName, sheetName, sb.ToString()));}AssetDatabase.Refresh();}private static void processCommand(string command, string argument){ProcessStartInfo start = new ProcessStartInfo(command);start.Arguments = argument;start.CreateNoWindow = false;start.ErrorDialog = true;start.UseShellExecute = false;if(start.UseShellExecute){start.RedirectStandardOutput = false;start.RedirectStandardError = false;start.RedirectStandardInput = false;} else{start.RedirectStandardOutput = true;start.RedirectStandardError = true;start.RedirectStandardInput = true;start.StandardOutputEncoding = System.Text.UTF8Encoding.UTF8;start.StandardErrorEncoding = System.Text.UTF8Encoding.UTF8;}Process p = Process.Start(start);if(!start.UseShellExecute){UnityEngine.Debug.Log(p.StandardOutput.ReadToEnd());UnityEngine.Debug.Log(p.StandardError.ReadToEnd());}p.WaitForExit();p.Close();}}
#endif运行 Tools/SpritesPacker/CommandBuild，并查看SheetsByTP目录下打包好的图集：
发现得到了两个文件，一个就是打包好的大图，及一个XML格式的配置文件：
但这样子的图集，unity并不能用，还需要做进一步的处理。这里先说下原理。在Unity里，一张图片的格式很多
不同格式有着不同的用途（UGUI用的是Sprite的格式），当我们往Unity里导入图片时，这张图片是什么格式由TextureImporter类决定，大家可以去看看这个类的API。然后我们再在Unity里随便找到一张图片的 .meta文件，用你喜欢的文本编辑器打开它：
fileFormatVersion: 2
guid: 542eed357a373ac4186621aa69a5ae78
timeCreated: 1456884951
licenseType: Pro
TextureImporter:fileIDToRecycleName: {}serializedVersion: 2mipmaps:mipMapMode: 0enableMipMap: 1linearTexture: 0correctGamma: 0fadeOut: 0borderMipMap: 0mipMapFadeDistanceStart: 1mipMapFadeDistanceEnd: 3bumpmap:convertToNormalMap: 0externalNormalMap: 0heightScale: .25normalMapFilter: 0isReadable: 0grayScaleToAlpha: 0generateCubemap: 0cubemapConvolution: 0cubemapConvolutionSteps: 8cubemapConvolutionExponent: 1.5seamlessCubemap: 0textureFormat: -1maxTextureSize: 2048textureSettings:filterMode: -1aniso: -1mipBias: -1wrapMode: -1nPOTScale: 1lightmap: 0rGBM: 0compressionQuality: 50allowsAlphaSplitting: 0spriteMode: 0spriteExtrude: 1spriteMeshType: 1alignment: 0spritePivot: {x: .5, y: .5}spriteBorder: {x: 0, y: 0, z: 0, w: 0}spritePixelsToUnits: 100alphaIsTransparency: 0textureType: -1buildTargetSettings: []spriteSheet:sprites: []spritePackingTag: userData: assetBundleName: assetBundleVariant:
里边有个spriteSheet的项，在 TextureImporter的API里对应
发现是一个SpriteMetaData的数组。在看看SpriteMetaData有什么
我们只要把这些信息填好就行。上代码：
#if UNITY_EDITOR
using UnityEngine;
using System;
using System.IO;
using UnityEditor;
using System.Collections.Generic;
using System.Xml;
public class MySpritesPacker : Editor
{[MenuItem("Tools/SpritesPacker/TexturePacker")]public static void BuildTexturePacker(){string inputPath = string.Format("{0}/SheetsByTP/", Application.dataPath);string[] imagePath = Directory.GetFiles(inputPath);foreach (string path in imagePath){if (Path.GetExtension(path) == ".png" || Path.GetExtension(path) == ".PNG"){string sheetPath = GetAssetPath(path);Texture2D texture = AssetDatabase.LoadAssetAtPath<Texture2D>(sheetPath);Debug.Log(texture.name);string rootPath = string.Format("{0}/TexturePacker/{1}", Application.dataPath,texture.name);string pngPath = rootPath + "/" + texture.name + ".png";TextureImporter asetImp = null;Dictionary<string, Vector4> tIpterMap = new Dictionary<string,Vector4>();if (Directory.Exists(rootPath)){if(File.Exists(pngPath)){Debug.Log("exite: " + pngPath);asetImp = GetTextureIpter(pngPath);SaveBoreder(tIpterMap, asetImp);File.Delete(pngPath);}File.Copy(inputPath + texture.name + ".png", pngPath);}else{Directory.CreateDirectory(rootPath);File.Copy(inputPath + texture.name + ".png", pngPath);}AssetDatabase.Refresh();FileStream fs = new FileStream(inputPath + texture.name + ".xml", FileMode.Open);StreamReader sr = new StreamReader(fs);string jText = sr.ReadToEnd();fs.Close();sr.Close();XmlDocument xml = new XmlDocument();xml.LoadXml(jText);XmlNodeList elemList = xml.GetElementsByTagName("SubTexture");WriteMeta(elemList, texture.name, tIpterMap);}}AssetDatabase.Refresh();}//如果这张图集已经拉好了9宫格，需要先保存起来static void SaveBoreder(Dictionary<string,Vector4> tIpterMap,TextureImporter tIpter){for(int i = 0,size = tIpter.spritesheet.Length; i < size; i++){tIpterMap.Add(tIpter.spritesheet[i].name, tIpter.spritesheet[i].border);}}static TextureImporter GetTextureIpter(Texture2D texture){TextureImporter textureIpter = null;string impPath = AssetDatabase.GetAssetPath(texture);textureIpter = TextureImporter.GetAtPath(impPath) as TextureImporter;return textureIpter;}static TextureImporter GetTextureIpter(string path){TextureImporter textureIpter = null;Texture2D textureOrg = AssetDatabase.LoadAssetAtPath<Texture2D>(GetAssetPath(path));string impPath = AssetDatabase.GetAssetPath(textureOrg);textureIpter = TextureImporter.GetAtPath(impPath) as TextureImporter;return textureIpter;}//写信息到SpritesSheet里static void WriteMeta(XmlNodeList elemList, string sheetName,Dictionary<string,Vector4> borders){string path = string.Format("Assets/TexturePacker/{0}/{1}.png", sheetName, sheetName);Texture2D texture = AssetDatabase.LoadAssetAtPath <Texture2D>(path);string impPath = AssetDatabase.GetAssetPath(texture);TextureImporter asetImp = TextureImporter.GetAtPath(impPath) as TextureImporter;SpriteMetaData[] metaData = new SpriteMetaData[elemList.Count];for (int i = 0, size = elemList.Count; i < size; i++){XmlElement node = (XmlElement)elemList.Item(i);Rect rect = new Rect();rect.x = int.Parse(node.GetAttribute("x"));rect.y = texture.height - int.Parse(node.GetAttribute("y")) - int.Parse(node.GetAttribute("height"));rect.width = int.Parse(node.GetAttribute("width"));rect.height = int.Parse(node.GetAttribute("height"));metaData[i].rect = rect;metaData[i].pivot = new Vector2(0.5f, 0.5f);metaData[i].name = node.GetAttribute("name");if (borders.ContainsKey(metaData[i].name)){metaData[i].border = borders[metaData[i].name];}}asetImp.spritesheet = metaData;asetImp.textureType = TextureImporterType.Sprite;asetImp.spriteImportMode = SpriteImportMode.Multiple;asetImp.mipmapEnabled = false;asetImp.SaveAndReimport();}static string GetAssetPath(string path){string[] seperator = { "Assets" };string p = "Assets" + path.Split(seperator, StringSplitOptions.RemoveEmptyEntries)[1];return p;}}internal class TextureIpter
{public string spriteName = "";public Vector4 border = new Vector4();public TextureIpter() { }public TextureIpter(string spriteName, Vector4 border){this.spriteName = spriteName;this.border = border;}
}
#endif然后点击 Tools/SpritesPacker/TexturePacker，看看 TexturePacker文件夹，会发现
这样Unity就用了，为了验证能用，我们把原来的小图和在TP里打包的图集都删掉，然后创建一些Image，用上我们打包好的图集里的图片。
到此就成功地在Unity用上了用TP打包好的图集了。
图片用到的九宫格信息也在这里哦！