【转】将图集切割成单个单个的图片

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假设有一张png/tga图集，导入到unity，放置目录"Assets/Resources/UI"（UI文件夹可替换成其他的，重要的是要在"Assets/Resources/"路径下），默认为如下设置：

为了可以使用Unity自带的精灵切割，要将纹理类型改成"Sprite"，"Sprite Mode"改成"Multiple"，"Format"改成"Truecolor"，点击"Apply"按钮进行应用。

接着，点击"Sprite Editor"打开精灵编辑器，点击左上角的"Slice"按钮，弹出切片设置，再次点击里面的"Slice"按钮，就会自动对图片进行切割，如下图所示：

在对切割不完整的地方进行修正后，点击右上角的"Apply"按钮，进行保存。可以看到Project视图下这个图集，已经被分割出许多小图了，如下图所示：

接下来，因为要对图片进行读写操作，要更改图片的属性才能进行，否则会提示如下：

UnityException: Texture 'testUI' is not readable, the texture memory can not be accessed from scripts. You can make the texture readable in the Texture Import Settings.

将图片纹理类型更改为"Advanced"，将"Read/Write Enabled"属性进行打勾，如下图所示：

创建一个脚本文件，代码如下：

[C#] 纯文本查看复制代码

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usingUnityEngine;
usingUnityEditor;
 
publicclass TestSaveSprite
{
    [MenuItem("Tools/导出精灵")]
    staticvoid SaveSprite()
    {
        stringresourcesPath = "Assets/Resources/";
        foreach(Object obj inSelection.objects)
        {
            stringselectionPath = AssetDatabase.GetAssetPath(obj);
 
            // 必须最上级是"Assets/Resources/"
            if(selectionPath.StartsWith(resourcesPath))
            {
                stringselectionExt = System.IO.Path.GetExtension(selectionPath);
                if(selectionExt.Length == 0)
                {
                    continue;
                }
 
                // 从路径"Assets/Resources/UI/testUI.png"得到路径"UI/testUI"
                stringloadPath = selectionPath.Remove(selectionPath.Length - selectionExt.Length);
                loadPath = loadPath.Substring(resourcesPath.Length);
 
                // 加载此文件下的所有资源
                Sprite[] sprites = Resources.LoadAll<Sprite>(loadPath);
                if(sprites.Length > 0)
                {
                    // 创建导出文件夹
                    stringoutPath = Application.dataPath + "/outSprite/"+ loadPath;
                    System.IO.Directory.CreateDirectory(outPath);
 
                    foreach(Sprite sprite insprites)
                    {
                        // 创建单独的纹理
                        Texture2D tex = newTexture2D((int)sprite.rect.width, (int)sprite.rect.height, sprite.texture.format, false);
                        tex.SetPixels(sprite.texture.GetPixels((int)sprite.rect.xMin, (int)sprite.rect.yMin,
                            (int)sprite.rect.width, (int)sprite.rect.height));
                        tex.Apply();
 
                        // 写入成PNG文件
                        System.IO.File.WriteAllBytes(outPath + "/"+ sprite.name + ".png", tex.EncodeToPNG());
                    }
                    Debug.Log("SaveSprite to " + outPath);
                }
            }
        }
        Debug.Log("SaveSprite Finished");
    }
}

在Unity编辑器将会看到Tools菜单下多了"导出精灵"项，选中图集，然后点击"导出精灵"菜单项，即可导出子图成功。如下图所示：

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