RenderTexture on RawImage not displaying anything

I have a RenderTexture defined like so:

Code (CSharp):

1.  Render = new RenderTexture(512, 512, 8);
2. Render.enableRandomWrite = true;
3. Render.filterMode = FilterMode.Point;
4. Render.Create();

And a RawImage defined like so:

Code (CSharp):

1.  Img = gameobject.GetComponent<RawImage>();
2. Img.rectTransform.sizeDelta = new Vector2(1, 1);
3. Img.texture = Render;

I then have a compute shader which is simply the base code that unity provides:

Code (CSharp):

1.  // Each #kernel tells which function to compile; you can have many kernels
2. #pragma kernel CSMain
3. // Create a RenderTexture with enableRandomWrite flag and set it
4. // with cs.SetTexture
5. RWTexture2D<float4> Result;
6. [numthreads(1,1,1)]
7. void CSMain(uint3 id : SV_DispatchThreadID)
8. {
9.      // TODO: insert actual code here!
10.      Result[id.xy] = float4(id.x & id.y, (id.x & 15) / 15.0, (id.y & 15) / 15.0, 0.0);
11. }
12.  

I then call the compute shader such that it will render the sierpiński triangle that the unity base code generates onto my raw image.

Code (CSharp):

1. Compute.SetTexture(ComputeKernel, "Result", Render);
2. Compute.Dispatch(ComputeKernel, 512, 512, 1);

The problem is that the raw image remains blank. Using the inspect I can see that the render texture has generated the correct image, but for somereason raw image doesn't show it.

If I use a normal sprite image, or convert the render texture to a Texture2D using ReadPixels it works fine, however I should not need to do this with a render texture and raw image right?

Image of the raw image not working, but the render texture is successful as shown in the inspector:


For some reason, when I set the material of the raw image to Default-Line it works for some reason, but when the material is blank or Sprites-Default it does not work:



I have a thought that this is due to the texture format as unity uses DXT5 compression for Texture2D and Sprites, but I am not sure how to get this compression from the compute shader. I do not want to have to convert my render texture to a texture 2D either.

If someone could help me solve this issue that would be great

Additional information:

• Unity version 2020.1.4f1
  
  
• I am using Universal RP in my project (I have tested this in a separate project without Universal RP and the same problem occurs)
  

 

The images I sent in the previous post seemed to have not worked so I have attached them here again:

For some reason, when I set the material of the raw image to Default-Line it works for some reason, but when the material is blank or Sprites-Default it does not work:


Image of the raw image not working, but the render texture is successful as shown in the inspector:

 

Because the alpha channel value is zero.
Just need to change the code like below:
Result[id.xy] = float4((id.x / 255.0), (id.y / 255.0), 0.0, 1.0);

 

Might also be worth noting that RawImage needs to be part of a canvas, while a SpriteRenderer does not.