1991参考链接：
http://www.xuanyusong.com/archives/3304
http://www.xuanyusong.com/archives/3315
Sprite Packer的使用：
http://liweizhaolili.blog.163.com/blog/static/1623074420131151303310/
关键点：
1.在unity5中，Statistics面板中的Batches即为drawcall。并且，新建一个空场景，drawcall的初始值为2，所以一般drawcall的计算要从2开始
2.在导入图片时，最好就是一个图集对应一个文件夹，文件夹的名字即为图集的名字
[csharp]view plaincopy
usingUnityEngine;
usingUnityEditor;
usingSystem.IO;
publicclassAutoSetPackingTag : AssetPostprocessor {
voidOnPostprocessTexture(Texture2D texture)
{
stringatlasName =newDirectoryInfo(Path.GetDirectoryName(assetPath)).Name;
TextureImporter textureImporter = assetImporterasTextureImporter;
textureImporter.textureType = TextureImporterType.Sprite;
textureImporter.spritePackingTag = atlasName;
textureImporter.mipmapEnabled =false;
}
}
3.需要打包成图集的图片不能放在Resources文件夹内，也就是说，我们无法通过Resources.Load的方式加载图片。对此，有两种解决方法：
a.将图片保存到prefab中，prefab放到Resources文件夹内。不过当需要加载的图片比较多时，这种方法就比较麻烦。可以使用ScriptableObject把图片序列化保存，这样会比较方便一些
[csharp]view plaincopy
usingUnityEngine;
usingSystem.Collections.Generic;
usingSystem.IO;
usingUnityEditor;
publicclassSpriteScriptableObject : ScriptableObject {
publicList list =newList();
//字典无法被序列化
publicDictionary nameSpriteDir =newDictionary();
publicvoidReadData(stringdataDir)
{
list =newList();
string[] filePaths = Directory.GetFiles(dataDir);
foreach(stringsinfilePaths)
{
if(!s.EndsWith(".meta"))
{
Sprite sprite = AssetDatabase.LoadAssetAtPath(s);
list.Add(sprite);
Debug.Log(sprite.name);
}
}
}
publicvoidInit()
{
for(inti = 0; i < list.Count; i++)
{
nameSpriteDir.Add(list[i].name, list[i]);
}
}
}
[csharp]view plaincopy
usingUnityEngine;
usingSystem.Collections;
usingUnityEditor;
usingSystem.IO;
usingSystem.Reflection;
usingSystem;
publicenumScriptableObjectType
{
SpriteScriptableObject,
}
publicclassCreateScriptableObject : EditorWindow {
staticstringdataDir;
staticstringoutputDir ="Assets/";
staticstringname;
staticScriptableObjectType scriptableObjectType;
[MenuItem("Window/CreateScriptableObject")]
staticvoidInit()
{
EditorWindow.GetWindow(typeof(CreateScriptableObject));
}
voidOnGUI()
{
EditorGUILayout.BeginHorizontal();
dataDir = EditorGUILayout.TextField("数据目录", dataDir);
if(GUILayout.Button("拾取路径")) dataDir = AssetDatabase.GetAssetPath(Selection.objects[0]);
EditorGUILayout.EndHorizontal();
EditorGUILayout.BeginHorizontal();
outputDir = EditorGUILayout.TextField("输出目录", outputDir);
if(GUILayout.Button("拾取路径")) outputDir = AssetDatabase.GetAssetPath(Selection.objects[0]);
EditorGUILayout.EndHorizontal();
name = EditorGUILayout.TextField("名字", name);
scriptableObjectType = (ScriptableObjectType)EditorGUILayout.EnumPopup("类型", scriptableObjectType);
if(GUILayout.Button("输出"))
{
//Type.GetType对于继承UnityEngine.Object的类会返回空
//string className = scriptableObjectType.ToString();
//Debug.Log(className);
//Type t = Type.GetType(className);
//if (t == null) Debug.Log("null");
switch(scriptableObjectType)
{
caseScriptableObjectType.SpriteScriptableObject :
SpriteScriptableObject so = ScriptableObject.CreateInstance();
so.ReadData(dataDir);
AssetDatabase.CreateAsset(so, outputDir + name +".asset");
break;
default:
break;
}
AssetDatabase.Refresh();
}
}
}
[csharp]view plaincopy
usingUnityEngine;
usingSystem.Collections;
usingSystem.Collections.Generic;
usingUnityEngine.UI;
publicclassNewBehaviourScript1 : MonoBehaviour {
publicImage[] images;
// Use this for initialization
voidStart ()
{
SpriteScriptableObject sso = Resources.Load("2");
sso.Init();
Debug.Log(sso.list.Count);
Debug.Log(sso.nameSpriteDir.Count);
images[0].sprite = sso.nameSpriteDir["a"];
images[1].sprite = sso.nameSpriteDir["b"];
images[2].sprite = sso.nameSpriteDir["c"];
}
}
b.使用AB包的形式。将同一个图集的小图的AB包名字设置为相同的，即可将这些小图打包到同一个AB包中
[csharp]view plaincopy
usingUnityEngine;
usingSystem.Collections;
usingUnityEngine.UI;
publicclassNewBehaviourScript : MonoBehaviour {
publicImage[] images;
// Use this for initialization
voidStart ()
{
AssetbBundleManager.Instance.Load(@"file:///"+ Application.dataPath +"/AB/","2.unity3d",
(ab, name) =>
{
Sprite a = AssetbBundleManager.Instance.GetAsset(ab,"a");
images[0].sprite = a;
Sprite b = AssetbBundleManager.Instance.GetAsset(ab,"b");
images[1].sprite = b;
Sprite c = AssetbBundleManager.Instance.GetAsset(ab,"c");
images[2].sprite = c;
});
}
}
4.图集占内存的计算：对于一张1024*1024的RGBA图集，占4M内存(1024*1024*4)
5.如果把带透明通道和不带透明通道的小图打包到同一图集，unity会把它分成两组