动态合并图片到一个图集

最近做mmo的时候发现有很多琐碎的icon，比如战场中的头像，小地图的icon之类的，占用了很多的draw call 为了节省draw call就找到了这个代码。

using DaVikingCode.AssetPacker;
using System.Collections;
using System.Collections.Generic;
using System.IO;
using UnityEngine;
using UnityEngine.UI;

public class AssetPackerExample : MonoBehaviour {
	
	public Image anim;

	AssetPacker assetPacker;
	
	void Start （） {

		// We just copy and paste files so you don‘t have to do it manually.
		CopyPasteFoldersAndPNG（Application.dataPath + “/RuntimeSpriteSheetsGenerator/Demos/Sprites“ Application.persistentDataPath）;

		string[] files = Directory.GetFiles（Application.persistentDataPath + “/Textures“ “*.png“）;

		assetPacker = GetComponent（）;

		assetPacker.OnProcessCompleted.AddListener（LaunchAnimations）;

		assetPacker.AddTexturesToPack（files）;
		assetPacker.Process（）;
	}

	void LaunchAnimations（） {

		StartCoroutine（LoadAnimation（））;
	}

	IEnumerator LoadAnimation（） {

		Sprite[] sprites = assetPacker.GetSprites（“walking“）;

		int j = 0;
		while （j < sprites.Length） {

			anim.sprite = sprites[j++];

			yield return new WaitForSeconds（0.1f）;

			if （j == sprites.Length）
				j = 0;
		}
	}

	void CopyPasteFoldersAndPNG（string SourcePath string DestinationPath） {

		foreach （string dirPath in Directory.GetDirectories（SourcePath “*“ SearchOption.AllDirectories））
			Directory.CreateDirectory（dirPath.Replace（SourcePath DestinationPath））;

		foreach （string newPath in Directory.GetFiles（SourcePath “*.png“ SearchOption.AllDirectories））
			File.Copy（newPath newPath.Replace（SourcePath DestinationPath） true）;
	}

}

 属性            大小     日期    时间   名称
----------- ---------  ---------- -----  ----
     目录           0  2019-04-30 10:37  UnityRuntimeSpriteSheetsGenerator-master\
     文件         449  2017-02-02 05:28  UnityRuntimeSpriteSheetsGenerator-master\.gitignore
     目录           0  2018-10-16 14:58  UnityRuntimeSpriteSheetsGenerator-master\.vs\
     目录           0  2018-10-16 14:58  UnityRuntimeSpriteSheetsGenerator-master\.vs\UnityRuntimeSpriteSheetsGenerator-master\
     目录           0  2018-10-16 15:00  UnityRuntimeSpriteSheetsGenerator-master\.vs\UnityRuntimeSpriteSheetsGenerator-master\v15\
     文件       27648  2018-10-16 15:00  UnityRuntimeSpriteSheetsGenerator-master\.vs\UnityRuntimeSpriteSheetsGenerator-master\v15\.suo
     目录           0  2018-10-16 14:58  UnityRuntimeSpriteSheetsGenerator-master\.vs\UnityRuntimeSpriteSheetsGenerator-master\v15\sqlite3\
     文件      552960  2018-10-16 14:58  UnityRuntimeSpriteSheetsGenerator-master\.vs\UnityRuntimeSpriteSheetsGenerator-master\v15\sqlite3\storage.ide
     目录           0  2018-10-15 17:09  UnityRuntimeSpriteSheetsGenerator-master\Assets\
     目录           0  2018-10-15 17:09  UnityRuntimeSpriteSheetsGenerator-master\Assets\RuntimeSpriteSheetsGenerator\
     目录           0  2018-10-15 17:09  UnityRuntimeSpriteSheetsGenerator-master\Assets\RuntimeSpriteSheetsGenerator\Demos\
     目录           0  2018-10-15 17:09  UnityRuntimeSpriteSheetsGenerator-master\Assets\RuntimeSpriteSheetsGenerator\Demos\Scenes\
     文件       12397  2017-02-02 05:28  UnityRuntimeSpriteSheetsGenerator-master\Assets\RuntimeSpriteSheetsGenerator\Demos\Scenes\AssetPacker.unity
     文件         174  2017-02-02 05:28  UnityRuntimeSpriteSheetsGenerator-master\Assets\RuntimeSpriteSheetsGenerator\Demos\Scenes\AssetPacker.unity.meta
     文件       34317  2017-02-02 05:28  UnityRuntimeSpriteSheetsGenerator-master\Assets\RuntimeSpriteSheetsGenerator\Demos\Scenes\RectanglePacking.unity
     文件         174  2017-02-02 05:28  UnityRuntimeSpriteSheetsGenerator-master\Assets\RuntimeSpriteSheetsGenerator\Demos\Scenes\RectanglePacking.unity.meta
     文件         191  2017-02-02 05:28  UnityRuntimeSpriteSheetsGenerator-master\Assets\RuntimeSpriteSheetsGenerator\Demos\Scenes.meta
     目录           0  2018-10-15 17:09  UnityRuntimeSpriteSheetsGenerator-master\Assets\RuntimeSpriteSheetsGenerator\Demos\scripts\
     文件        1505  2017-02-02 05:28  UnityRuntimeSpriteSheetsGenerator-master\Assets\RuntimeSpriteSheetsGenerator\Demos\scripts\AssetPackerExample.cs
     文件         262  2017-02-02 05:28  UnityRuntimeSpriteSheetsGenerator-master\Assets\RuntimeSpriteSheetsGenerator\Demos\scripts\AssetPackerExample.cs.meta
     文件        4805  2017-02-02 05:28  UnityRuntimeSpriteSheetsGenerator-master\Assets\RuntimeSpriteSheetsGenerator\Demos\scripts\RectanglePackingExample.cs
     文件         262  2017-02-02 05:28  UnityRuntimeSpriteSheetsGenerator-master\Assets\RuntimeSpriteSheetsGenerator\Demos\scripts\RectanglePackingExample.cs.meta
     文件         191  2017-02-02 05:28  UnityRuntimeSpriteSheetsGenerator-master\Assets\RuntimeSpriteSheetsGenerator\Demos\scripts.meta
     目录           0  2018-10-15 17:09  UnityRuntimeSpriteSheetsGenerator-master\Assets\RuntimeSpriteSheetsGenerator\Demos\Sprites\
     目录           0  2018-10-15 17:09  UnityRuntimeSpriteSheetsGenerator-master\Assets\RuntimeSpriteSheetsGenerator\Demos\Sprites\Textures\
     文件       13804  2017-02-02 05:28  UnityRuntimeSpriteSheetsGenerator-master\Assets\RuntimeSpriteSheetsGenerator\Demos\Sprites\Textures\walking0001.png
     文件        2265  2017-02-02 05:28  UnityRuntimeSpriteSheetsGenerator-master\Assets\RuntimeSpriteSheetsGenerator\Demos\Sprites\Textures\walking0001.png.meta
     文件       13810  2017-02-02 05:28  UnityRuntimeSpriteSheetsGenerator-master\Assets\RuntimeSpriteSheetsGenerator\Demos\Sprites\Textures\walking0002.png
     文件        2265  2017-02-02 05:28  UnityRuntimeSpriteSheetsGenerator-master\Assets\RuntimeSpriteSheetsGenerator\Demos\Sprites\Textures\walking0002.png.meta
     文件       13693  2017-02-02 05:28  UnityRuntimeSpriteSheetsGenerator-master\Assets\RuntimeSpriteSheetsGenerator\Demos\Sprites\Textures\walking0003.png
     文件        2265  2017-02-02 05:28  UnityRuntimeSpriteSheetsGenerator-master\Assets\RuntimeSpriteSheetsGenerator\Demos\Sprites\Textures\walking0003.png.meta
............此处省略58个文件信息