I think it's just inconsistency between the 2 meeting edges. If you want nice looking edges, the 2 need to have the same form with equal amount of spacing all the way through. Your high-poly source mesh could go a lot higher to get that nice, even edge flow.
You are way overthinking this. Zoom out to a 'game view' distance. I bet those details drop down to not even be represented by more then 1 or 2 pixels.
I decided to stop caring as much and as long as I did my best and it looks good enough. It's better to have a finished good enough (but done as best you can) collection of assets in a scene than a few super polished assets in a half finished scene. Just my opinion.
I have found breaking out of what you're doing to be hard. Just keep going!
while it's true that this is a small error that doesn't really matter in context, everything happens for a reason and understanding it will make you a better worker. the problem is coming from your high-poly and how you're constructing those corners. post a wire of the unsubdivided HP if you want.
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I have found breaking out of what you're doing to be hard. Just keep going!