之前项目中需要用到截图功能，经过查找找到3种方式，这里做一个记录。

Application.CaptureScreenshot

Application 类下的 CaptureScreenshot 方法，截取的是某一帧时整个游戏的画面，或者说是全屏截图吧。
以下是两个重载的函数。其中 filename 参数为截图后保存下来的文件名； superSize 参数为增加分辨率的因数： 

//// 摘要://     Captures a screenshot at path filename as a PNG file.//// 参数://   filename://     Pathname to save the screenshot file to.////   superSize://     Factor by which to increase resolution.[Obsolete("Application.CaptureScreenshot is obsolete. Use ScreenCapture.CaptureScreenshot instead (UnityUpgradable) -> [UnityEngine] UnityEngine.ScreenCapture.CaptureScreenshot(*)",true)]publicstaticvoidCaptureScreenshot(string filename);//// 摘要://     Captures a screenshot at path filename as a PNG file.//// 参数://   filename://     Pathname to save the screenshot file to.////   superSize://     Factor by which to increase resolution.[Obsolete("Application.CaptureScreenshot is obsolete. Use ScreenCapture.CaptureScreenshot instead (UnityUpgradable) -> [UnityEngine] UnityEngine.ScreenCapture.CaptureScreenshot(*)",true)]publicstaticvoidCaptureScreenshot(string filename,int superSize);

通过上面的代码也可以看出，在新版的Unity中该函数被废弃了。新的系统函数类是 ScreenCapture 。

ScreenCapture

以下为系统类 ScreenCapture ： 

//// 摘要://     Functionality to take Screenshots.[NativeHeader("Modules/ScreenCapture/Public/CaptureScreenshot.h")]publicstaticclassScreenCapture{
   
   publicstaticvoidCaptureScreenshot(string filename);//// 摘要://     Captures a screenshot at path filename as a PNG file.//// 参数://   filename://     Pathname to save the screenshot file to.////   superSize://     Factor by which to increase resolution.////   stereoCaptureMode://     Specifies the eye texture to capture when stereo rendering is enabled.publicstaticvoidCaptureScreenshot(string filename,int superSize);publicstaticvoidCaptureScreenshot(string filename,StereoScreenCaptureMode stereoCaptureMode);publicstaticTexture2DCaptureScreenshotAsTexture