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Why are seams visible on a 3d model?

I'm not asking about any particular model, I'm just asking why seams are visible on any given model in general. I'm guessing it has something to do with the way the textures work, but obviously I'm not sure and I've gotten really curious and can't find any article on it. Why are seams visible, especially from greater distances?

Can anyone explain or link proper literature on the subject?
They aren't if you do it right. Visible lined seams are generally a result of scaling/interpolation/mip mapping that results in some of the background colour of the texture to seep through at the edges... Making perfect ups is one thing, but guaranteeing an unwrap still works perfectly at 10% of the resolution is the tricky part without going crazy wasteful with your margins.

So you're saying that I can technically fix any seam by additionally texturing background around the edge of the uv islands?

Well thanks a lot. I thought this issue was more complex and was expecting some info about lighting. Have a nice day or night or whatever's more adequate to your timezone.
Any decent baking software you use will have a "fill seams" or "island overdraw" option to do this for you automatically. And if you're doing hand painted, then of course just paint past the UV edges...
I don't know

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