Unity 多图片（带透明通道）合成

取个巧，利用Camera和Render Texture
在这里插入图片描述
多个2d图片组合成型

每个Square都单独设置一个层级

相机设置

RenderTexture设置，然后将RenderTexture放在一个RawImage上

以下是生成图片的代码


using UnityEngine.UI;
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using System.IO;
using System;
public class test2 : MonoBehaviour
{public RawImage rawImage;public RawImage rawImage2;void Start(){AAAAAA();}[ContextMenu("合成图片")]void AAAAAA(){Texture2D texture2D = TextureToTexture2D(rawImage2.texture);rawImage.texture = texture2D;rawImage.SetNativeSize();SavePicture(texture2D);}private Texture2D TextureToTexture2D(Texture texture){Texture2D texture2D = new Texture2D(texture.width, texture.height, TextureFormat.RGBA32, false);RenderTexture currentRT = RenderTexture.active;RenderTexture renderTexture = RenderTexture.GetTemporary(texture.width, texture.height, 32);Graphics.Blit(texture, renderTexture);RenderTexture.active = renderTexture;texture2D.ReadPixels(new Rect(0, 0, renderTexture.width, renderTexture.height), 0, 0);texture2D.Apply();RenderTexture.active = currentRT;RenderTexture.ReleaseTemporary(renderTexture);return texture2D;}private void SavePicture(Texture2D texture2D){byte[] bytes = texture2D.EncodeToPNG();//然后将这些纹理数据，成一个png图片文件string filename = Application.dataPath + "/" + GetDateName() + ".png";FileInfo[] fileInfos = new DirectoryInfo(QuickConfig.instance._照片保存路径).GetFiles();for (int i = 0; i < fileInfos.Length; i++){File.Delete(fileInfos[i].FullName);}System.IO.File.WriteAllBytes(filename, bytes);Debug.Log(string.Format("截屏了一张图片: {0}", filename, bytes));}/// <summary>/// 获取以日期命名的名称/// </summary>/// <returns>日期命名</returns>public static string GetDateName(){int hour = DateTime.Now.Hour;int minute = DateTime.Now.Minute;int second = DateTime.Now.Second;int year = DateTime.Now.Year;int month = DateTime.Now.Month;int day = DateTime.Now.Day;return string.Format("{0:D4}{1:D2}{2:D2}{3:D2}{4:D2}{5:D2}", year, month, day, hour, minute, second);}
}