Polish Surface is a modeling add-on for Blender that smooths mesh geometry while preserving specified edges. It allows you to select areas of a mesh and apply a smoothing operation that respects crease edges, making it useful for hard surface modeling and refining character clothing.

The tool operates in Edit Mode and provides several parameters to control the smoothing effect. You can adjust the overall amount of smoothing and use a 'straighten' function to align the edges of quad faces along edge loops. It includes options to maintain the volume of the model, preserve sharp corners on quads, and keep open boundary edges intact. It functions on both quad-based topology and triangulated meshes, such as those generated by sculpting.