How to calculate PPU for perfect pixel fit?

Unity Engine
1

I’m making a pixel art game, using URP (12.1.7), and the built-in Pixel Perfect Camera that comes with URP (Unity 2021.3.7f1). I have my UI, game view, and pixel perfect camera all at 224x126 resolution.

How on earth do I determine what PPU to make my sprites so that they appear dot-for-dot in the game (1 sprite pixel = 1 camera pixel)?

The only thing I can find online that looks helpful is this , namely the replies by ShervinM. But the pixel perfect camera calculates the Orthographic size by its Assets Pixels Per Unit value. So I have no idea where to even begin.

2

I did some testing, and it seems if the Pixel Perfect Camera’s PPU and your sprites’ PPU is the same, it is dot-for-dot in relation to the reference resolution.

But that can still mess up the sprites. for example, if the PPU is something like 9 or 63, the sprites still appear incredibly distorted or compacted.

And I’m currently not sure how to calculate the sweetspot for the PPU based on the resolution.

Currently my PPU is 15, which so far looks perfect, haven’t tested others close to it yet (or if I have, I don’t remember the results).