odf posted at 12:51AM Mon, 02 August 2021 - #4424372

The thing is, that render uses the lo-res mesh with three levels of subdivision, so in a perfect world any distortion present in the lo-res should have been fixed by that. That's why I'm saying that Poser must be subdividing UVs differently than we "predicted".

It's the initial subdivision that's the shock to the low poly UVs. The distortion is baked in I imagine at the first subdivision, further steps wouldn't correct it. I don't think it's about steps or amount but the initial shock. Just guessing.