Graph.Blit won't apply material (I think)

So, this has been stressful, as I couldn't figure out how to do what I want for a whole day... Basically, I want, when my game is paused, to "take a screenshot", blur it and, then, exhibit it as the background for my pause menu! I'm not sure what is the best way to do this, but, after trying (and failing) a lot, I figured I could

Graphics.Blit

a texture drawn with

Texture2D.ReadPixels

into a

RenderTexture

, while, on that

Blit

call, passing a material with a shader blur to be applied to the texture. It looks a bit like this in my code:

Code (CSharp):

1. public class BgBlur : MonoBehaviour
2. {
3.     private RenderTexture renderTx;
4.     public Material blurMaterial;
5.     public RawImage img;
6.  
7.     private WaitForEndOfFrame frameEnd = new WaitForEndOfFrame();
8.  
9.  
10.     void Start()
11.     {
12.         renderTx = new RenderTexture(Screen.width, Screen.height, 0);
13.         img.texture = renderTx;
14.     }
15.  
16.     void OnEnable() {
17.         StartCoroutine(BlurBg());
18.     }
19.  
20.     public IEnumerator BlurBg() {
21.         yield return frameEnd;
22.  
23.         var scrnTx = new Texture2D(Screen.width, Screen.height);
24.         scrnTx.ReadPixels(new Rect(0, 0, Screen.width, Screen.height), 0, 0, false);
25.         scrnTx.Apply();
26.  
27.         Graphics.Blit(scrnTx, renderTx, blurMaterial);
28.        // img.texture = scrnTx;
29.  
30.         yield return null;
31.     }
32. }

That

blurMaterial

is assigned, via editor, to a material containing only a "Frosted Glass" shader I found on StackOverflow, but I guess it should work, because, when I put it directly on other stuff, via editor, that stuff actually gets blurred.


I started having doubts about

Texture2D.ReadPixels

, wondering if it, really, was reading those pixels, but, upon uncommenting that line below the

Blit

call, the image would render, although, obviously, without being blurred, suggesting the problem lies, once again, in the

Blit

call (maybe?).


I'm pretty much desperate at this point, as I've been trying to make this thing work since 1 PM and, now, it's 11:45 PM. HELP!