Automatic hole-filling of CAD models with feature-preserving

In this paper, we propose an automatic hole-filling method, particularly for recovering missing feature curves and corners. We first extract the feature vertices around a hole of a CAD model and classify them into different feature sets. These feature sets are then automatically paired, using ordered double normals, Gaussian mapping and convex/concave analysis, to produce missing feature curves. Additionally, by minimizing a newly defined energy, the missing corners can be efficiently recovered as well. The hole is consequently divided into simple sub-holes according to the produced feature curves and recovered corners. Finally, each sub-hole is filled by a modified advancing front method individually. The experiments show that our approach is simple, efficient, and suitable for CAD systems.

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► A feature preserved hole-filling method is proposed for triangular meshes.
► Missing feature curves can be automatically restored from the detected features.
► Missing corners can be effectively recovered by minimizing a new presented energy.
► Cube spline interpolation guarantees the accuracy of the recovered feature curves.