Abstract: Feature edges identification for triangular meshes is widely used in digital geometry
processing and computer aided manufacturing (CAM) of dies. The shortcomings and corresponding
origin of the existing algorithms about feature edges detection are pointed out in the paper. Furthermore,
a new robust algorithm that identifies feature edges of triangular meshes is presented. The proposed
algorithm is based on the identification of feature vertices of the mesh, and it can identify the edges with
small dihedral angles which are often ignored by the existing algorithms. The proposed algorithm can
improve the accuracy of identifying mesh edges with C1 discontinuities. This conclusion is supported by
lots of examples in the paper．

Key words: feature edges, dihedral angles, normal curvature, triangular meshes