WaitForEndOfFrame

Description

Waits until the end of the frame after all cameras and GUI is rendered, just before displaying the frame on screen.

You can use it to read the display into a texture, encode it as an image file (see Texture2D.ReadPixels and Texture2D.EncodeToPNG) and send it somewhere.

yield new WaitForEndOfFrame ();

using UnityEngine;
using System.Collections;

public class ExampleClass : MonoBehaviour {
    IEnumerator Example() {
        yield return new WaitForEndOfFrame();
    }
}

Another example:

// Saves screenshot as PNG file.
import System.IO;

// Take a shot immediately
function Start() {
    UploadPNG();
}

function UploadPNG() {
    // We should only read the screen buffer after rendering is complete
    yield WaitForEndOfFrame();

    // Create a texture the size of the screen, RGB24 format
    var width = Screen.width;
    var height = Screen.height;
    var tex = new Texture2D( width, height, TextureFormat.RGB24, false );
    // Read screen contents into the texture
    tex.ReadPixels( Rect(0, 0, width, height), 0, 0 );
    tex.Apply();

    // Encode texture into PNG
    var bytes = tex.EncodeToPNG();
    Destroy( tex );

    // For testing purposes, also write to a file in the project folder
    // File.WriteAllBytes(Application.dataPath + "/../SavedScreen.png", bytes);


    // Create a Web Form
    var form = new WWWForm();
    form.AddField("frameCount", Time.frameCount.ToString());
    form.AddBinaryData("fileUpload",bytes);

    // Upload to a cgi script
    var w = WWW("http://localhost/cgi-bin/env.cgi?post", form);
    yield w;
    if (w.error != null)
        print(w.error);
    else
        print("Finished Uploading Screenshot");
}

using System.IO;
using UnityEngine;
using System.Collections;

public class ExampleClass : MonoBehaviour
{
    // Take a shot immediately
    IEnumerator Start()
    {
        UploadPNG();
        yield return null;
    }

    IEnumerator UploadPNG()
    {
        // We should only read the screen buffer after rendering is complete
        yield return new WaitForEndOfFrame();

        // Create a texture the size of the screen, RGB24 format
        int width = Screen.width;
        int height = Screen.height;
        Texture2D tex = new Texture2D(width, height, TextureFormat.RGB24, false);

        // Read screen contents into the texture
        tex.ReadPixels(new Rect(0, 0, width, height), 0, 0);
        tex.Apply();

        // Encode texture into PNG
        byte[] bytes = tex.EncodeToPNG();
        Destroy(tex);

        // For testing purposes, also write to a file in the project folder
        // File.WriteAllBytes(Application.dataPath + "/../SavedScreen.png", bytes);


        // Create a Web Form
        WWWForm form = new WWWForm();
        form.AddField("frameCount", Time.frameCount.ToString());
        form.AddBinaryData("fileUpload", bytes);

        // Upload to a cgi script
        WWW w = new WWW("http://localhost/cgi-bin/env.cgi?post", form);
        yield return w;
        if (w.error != null)
            print(w.error);
        else
            print("Finished Uploading Screenshot");
        yield return null;
    }
}

no example available in JavaScript

using UnityEngine;
using System.Collections;

public class ExampleScript : MonoBehaviour
{
    // A script that shows destination alpha channel in the game view.

    Material mat;

    void CreateMaterial()
    {
        // Unity has a built-in shader that is useful for drawing
        // simple colored things. In this case, we just want to use
        // a blend mode that inverts destination colors.
        var shader = Shader.Find("Hidden/Internal-Colored");
        mat = new Material(shader);
        mat.hideFlags = HideFlags.HideAndDontSave;
        // Set blend mode to show destination alpha channel.
        mat.SetInt("_SrcBlend", (int)UnityEngine.Rendering.BlendMode.DstAlpha);
        mat.SetInt("_DstBlend", (int)UnityEngine.Rendering.BlendMode.Zero);
        // Turn off backface culling, depth writes, depth test.
        mat.SetInt("_Cull", (int)UnityEngine.Rendering.CullMode.Off);
        mat.SetInt("_ZWrite", 0);
        mat.SetInt("_ZTest", (int)UnityEngine.Rendering.CompareFunction.Always);
    }

    public IEnumerator Start()
    {
        CreateMaterial();
        while (true)
        {
            // Wait until all rendering + UI is done.
            yield return new WaitForEndOfFrame();
            // Draw a quad that shows alpha channel.
            GL.PushMatrix();
            GL.LoadOrtho();
            mat.SetPass(0);
            GL.Begin(GL.QUADS);
            GL.Vertex3(0, 0, 0);
            GL.Vertex3(1, 0, 0);
            GL.Vertex3(1, 1, 0);
            GL.Vertex3(0, 1, 0);
            GL.End();
            GL.PopMatrix();
        }
        yield return null;
    }
}

Inherited Members