From UVLayout Docs

UVLayout uses a dynamics based algorithm to flatten 3D geometry, along seams cut by the user, creating low distortion UVs for Poly or SUBD surfaces. It also supports the importing of geometry with existing UVs so they can be reflattened into these low distortion layouts. Originally developed as part of CySlice, UVLayout can now be run stand-alone, usable by anyone wanting to create UVs.

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