UV Autoflow — smart automatic UV unwrap

Stop manually marking seams on every prop. UV Autoflow places seams using mesh signals (sharp angles, material boundaries, hidden faces), unwraps in one click, then straightens and mirror-symmetrises the result.

What it solves

Standard Smart UV Project is a black box that often produces over-cut or misaligned UVs. ZenUV and UVPackmaster solve the packing half of the problem. UV Autoflow solves the seam placement half — the part nobody else automates well.

Headline features

• Heuristic seam scoring. Each edge is scored on three signals: dihedral angle (curvature), material slot boundary, downward-facing visibility. Weights are user-configurable so you can lean on whichever signal matches your asset style.
• One-click pipeline. Score → mark seams → angle-based unwrap → repack. All in one button across a whole selection.
• Island straightening via PCA. Each UV island's principal axis is computed and rotated to horizontal, optionally snapped to the nearest 45° increment for clean rectangular packs.
• UV symmetry mirror. Detects mirrored vertex pairs along X/Y/Z, copies UVs from one side to the other with U-flip. Perfect for character faces, vehicles, hard-surface kit-bash.
• Mark seams only. Run the seam scoring without the unwrap — useful when you want to review and edit before committing.

Three seam signals

Signal	What it catches	Weight default
Curvature	Sharp angles like the edges of a cube, corners of buildings, fingers	1.0
Material boundary	Between two material slots — natural place to break islands	1.0
Visibility	Faces pointing downward — likely never seen, safe to seam	0.6

Why not Smart UV Project

Smart UV Project uses a single projection angle threshold and ignores material slots and visibility entirely. UV Autoflow combines three independent signals with user weights — you get UVs that respect both topology and intended look.

Compatibility

Blender 4.2 LTS and later on Windows / macOS / Linux. Works on any mesh, any topology.

License

GPL-3.0. No telemetry, no online activation.