Render texture stretched as I resize the game view

HI all, first post here.

I've been trying to follow Brackeys tutorial on creating portals but instead of the script shader, I'm using a graph shader similar to the one in this video. Thus I made my project use the URP, rather than the standard one I suspect the Brackeys video was using.

Overall, I got it working. Except that when I resize the game view, the render texture seems to stretch out:

Stretched out:


Normal aspect ratio:


Here's what the shader graph looks like:

In the Brackeys video, he mentions a way to fix this:

Code (CSharp):

1. void Start()
2. {
3.         if (otherCamera.targetTexture != null)
4.         {
5.              otherCamera.targetTexture.Release();
6.         }
7.         RenderTexture renderTexture = new RenderTexture(Screen.width, Screen.height, 24);
8.         otherCamera.targetTexture = renderTexture;
9.         otherMaterial.mainTexture = renderTexture;
10. }

Where

otherCamera

is the camera whose target texture is the render texture, and

otherMaterial

is the material for the render texture.

I tried this, but sadyl the result is just a black texture:


I also tried other things like calling

Create()

on the render texture, but nothing seems to work.

Any ideas?

 

Ironically, just a few minutes after I posted this I figured out the solution:

Code (CSharp):

1. void Start()
2. {
3.         otherCamera.aspect = ((float) Screen.width) / Screen.height;
4. }

This fixes the problem for me. Note that this only works if you start the game with the new game view size, not when you change it while the game is running.

 

I need to point out that the aspect solution doesn't always work, for example on pixel games where the target texture is a smaller size than the screen, you need somehow to fit the final textureRender on the screen with UV stretching to compensate but can't find any information on this. Looks like this is how Unity does it internally with cameras even if you render to texture

 

I fixed this by right clicking my Input Texture2D and setting it to Main Texture.
I also made sure there was no texture on the camera to begin with.