Polygon Smoothing Groups is a Blender addon designed to control polygon smoothing and sharp edges. It provides a system to assign, manage, and clear smoothing groups directly in Edit Mode. Users can assign groups with a single click, apply random groups while ensuring neighboring polygons do not share the same group ID, and isolate selections based on their group assignment status.

The addon includes tools to define smoothing groups based on specified angle thresholds. Unnecessary shared sharp edges are automatically removed when polygons are reassigned to the same group. An Auto Seam function is also available for UV unwrapping workflows, operating similarly to the auto-sharp edge generation.