Fig. 1. Neighborhood comparison algorithm to determine critical points. (a) Peak; (b) pit; (c) saddle

Fig. 2. Morse-Smale complex construction. (a) Rising Morse complex; (b) falling Morse complex; (c) Morse-Smale complex

Fig. 3. Feature extraction result graph. (a) Raw point cloud data; (b) Delaunaytriangulationconstruction; (c) piecewise linear Morse feature extraction

Fig. 4. Diagram of Experimental results. (a) Falling Morse Complex; (b) rising Morse Complex; (c) Morse-Smale complex and triangulation fitting; (d) partial details of Morse-Smale complex