Detection and Recovery of Sharp Features for 3D Mesh Models

The sharp features1, including edges, corners and boundaries, usually express the most important geometric information for triangular meshes. The purpose of this investigation is to reconstruct sharp edges from blended or chamfered features for mesh processing with high accuracy. The proposed approach involves two processes: sharpness-based region-recognizing, which identifies the feature vertices based on the vertex sharpness, and sharp-features reconstructing. In the process of region-recognizing, the angle variations of normal vectors are introduced to indicate the vertex sharpness. Then, the feature regions comprised of "sharp" vertices and facets could be identified. Furthermore, during the process of sharp feature reconstructing, the coordinates of concerned vertices are adjusted gradually using an iterative filtering algorithm depending on sharpness, which updates the feature regions from the inside-outside. Finally, the experimental results validate the effectiveness and robustness of the proposed method in sharpening meshes.