Installation

1. Download the file Edge-to-seam-toolkit.py
2. In Blender, go to Edit > Preferences > Add-ons > Install, then select the downloaded file
3. Enable the checkbox next to the add-on in the list

Where to find it

Open the N-panel in the 3D Viewport (press N) while in Edit Mode on a mesh object. You will find a new tab called UV Tools containing the Sharp to Seam panel. The same action is also available from the edge context menu (right-click) in Edit Mode.

How to use it

1. Mark your sharp edges, either manually or using Mesh > Shading > Set Sharp by Angle
2. Select the object (or objects, if using All Selected Objects)
3. Open the Sharp to Seam panel and choose your unwrap method: Angle Based or Conformal
4. Click Apply Sharp to Seams + Unwrap

The add-on will clear existing seams and UV maps, convert every sharp edge into a seam, and generate a fresh UVMap using an automatic unwrap.