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Dealing with tiles "squareness"
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Am I missing something about shaders?

Hi everyone,

I've came back to unity after a couple of years, and tried to add a simple full-screen effect on my 2D game. The idea is simple: take the current frame, take the previous frame, and display the pixel wise difference between the two.

I've looked at at least 5 different tutorials about Shaders, Render Features, Volume Render Features, Shader Graph etc. and none of them have given me a working result. I even tried to use ChatGPT as a last resort to try to get a minimal example working, but to no avail. Something was always wrong, incompatible, or not working. I am therefore asking the question:

Is there something fundamentally complicated with Unity's URP, or am I missing something obvious to create simple custom post-processing effects?


Thank you in advance, for context I'm a Software Engineer by trade, and manage to get most of what I want in Unity to work, but I'm stumped that I wasted hours on something that I expected to be simple.

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