Capture a (screen shot) scene shot with alpha

i want to take a screen shot with transparent background
i use this code but if my object was particles / additive it dosen’t show them or if i use antialiasing …
code :

			RenderTexture rt = new RenderTexture (resWidth, resHeight, 24); = rt;
			Texture2D screenShot = new Texture2D (resWidth, resHeight, TextureFormat.ARGB32, false); (); = rt;
			screenShot.ReadPixels (new Rect (0, 0, resWidth, resHeight), 0, 0); = null; = null; 
			Destroy (rt);
			byte[] bytes = screenShot.EncodeToPNG ();
			//string filename = ScreenShotName (resWidth, resHeight);
			string filename = string.Format ("{0}/mypic/screen_{1}x{2}_{3}.png",
		Application.dataPath, resWidth, resHeight, counter);
			counter = counter + 1;
			System.IO.File.WriteAllBytes (filename, bytes);

The property of the camera

Clear Flags = Depth only


public static Texture2D TakeScreenShot()
		return Screenshot ();
	static Texture2D Screenshot() {
		int resWidth = Camera.main.pixelWidth;
		int resHeight = Camera.main.pixelHeight;
		Camera camera = Camera.main;
		RenderTexture rt = new RenderTexture(resWidth, resHeight, 32);
		camera.targetTexture = rt;
		Texture2D screenShot = new Texture2D(resWidth, resHeight, TextureFormat.ARGB32, false);
		camera.Render(); = rt;
		screenShot.ReadPixels(new Rect(0, 0, resWidth, resHeight), 0, 0);
		screenShot.Apply ();
		camera.targetTexture = null; = null; // JC: added to avoid errors
		return screenShot;

	public static Texture2D SaveScreenshotToFile(string fileName)
		Texture2D screenShot = Screenshot ();
		byte[] bytes = screenShot.EncodeToPNG();
		System.IO.File.WriteAllBytes(fileName, bytes);
		return screenShot;

I’m not sure this is possible since when you screen shot you basically just capture what the camera is rendering, so know, you could try converting a certain color to transparency after you save the file. How you would do that I have know idea though…

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

public class Screenshot : MonoBehaviour

    private void Start()
        string filename = string.Format("Assets/Screenshots/capture_{0}.png", DateTime.Now.ToString("yyyy-MM-dd_HH-mm-ss-fff"));
        if (!Directory.Exists("Assets/Screenshots"))
        TakeTransparentScreenshot(Camera.main, Screen.width, Screen.height, filename);

    public static void TakeTransparentScreenshot(Camera cam, int width, int height, string savePath)
        // Depending on your render pipeline, this may not work.
        var bak_cam_targetTexture = cam.targetTexture;
        var bak_cam_clearFlags = cam.clearFlags;
        var bak_RenderTexture_active =;

        var tex_transparent = new Texture2D(width, height, TextureFormat.ARGB32, false);
        // Must use 24-bit depth buffer to be able to fill background.
        var render_texture = RenderTexture.GetTemporary(width, height, 24, RenderTextureFormat.ARGB32);
        var grab_area = new Rect(0, 0, width, height); = render_texture;
        cam.targetTexture = render_texture;
        cam.clearFlags = CameraClearFlags.SolidColor;

        // Simple: use a clear background
        cam.backgroundColor = Color.clear;
        tex_transparent.ReadPixels(grab_area, 0, 0);

        // Encode the resulting output texture to a byte array then write to the file
        byte[] pngShot = ImageConversion.EncodeToPNG(tex_transparent);
        File.WriteAllBytes(savePath, pngShot);

        cam.clearFlags = bak_cam_clearFlags;
        cam.targetTexture = bak_cam_targetTexture; = bak_RenderTexture_active;