Question Baking shader/material output into image. Texture2D.ReadPixels not working correctly.

Hi,

I try to bake a shader material into a PNG. For this, I use the following code

Code (CSharp):

1.  
2. void BakeTexture()
3. {
4.     var renderTexture = RenderTexture.GetTemporary(this._resolution.x, this._resolution.y, 0, GraphicsFormat.R8G8B8A8_UNorm, 1);
5.  
6.     Graphics.Blit(null, renderTexture, this._material);
7.  
8.     var texture = new Texture2D(this._resolution.x, this._resolution.y);
9.  
10.     RenderTexture.active = renderTexture;
11.     var start = new Vector2(-this._resolution.x / 2f, -this._resolution.y / 2f);
12.     var rect = new Rect(start, this._resolution);
13.     Debug.Log($"Draw rect: {rect}");
14.     texture.ReadPixels(rect, 0, 0);
15.     texture.Apply();
16.  
17.     var png = texture.EncodeToPNG();
18.     File.WriteAllBytes($"{this._folderPath}/{this._files}.png", png);
19.     AssetDatabase.Refresh();
20.  
21.     RenderTexture.active = null;
22.     RenderTexture.ReleaseTemporary(renderTexture);
23.     DestroyImmediate(texture);
24. }
25.  
26.  

The shader applied to a sprite looks like this (example):
View attachment 1112415

As you can see, in this case, it's a 60x30 units sized sprite which is centered at 0x0 (Lower-Left should be at -30x-15).

When I run the code above I get the following output:
View attachment 1112418

I already figured out, that when I use Vector2.zero as start (instead of the x/y-offset), it renders the full image like this
View attachment 1112421

but as you can see it is only the area in the world from 0x0 to 1x1 and not the whole area from -30x-15 to 30x15.

What am I doing wrong?