Partial retrieval of CAD models based on local surface region decomposition

Polynomial local shape descriptor on interest points for 3D part-in-whole matching

“…Liu et al [9] carried out a survey on part-in-whole matching. In engineering domain, most of the existing part-inwhole matching approaches [1,[10][11][12][13] focus on shapes with exact representations. For models with approximated representation, part-in-whole matching methods were primarily developed for general shapes, and can be classified into two categories: segments based methods and interest points based methods.…”

CAD Model Segmentation Algorithm Using the Fusion of PERT and Spectral Technology

“…ese segmentation methods may encounter both the resulting uncertainty problem and the efficiency problem. e region-based algorithms exhibit satisfying efficiency, but the results may not be unique, since the algorithm starts with different seed faces [1]. e cluster-based algorithms can yield a certain result, but their costs are high [1].…”

“…e region-based algorithms exhibit satisfying efficiency, but the results may not be unique, since the algorithm starts with different seed faces [1]. e cluster-based algorithms can yield a certain result, but their costs are high [1]. Meanwhile, they are less effective to find the meaningful components.…”

“…Subsequently, the efficiency of the partial retrieval is determined by the granularity of the model elements. When the models are complex, the triangles in mesh models are not sufficiently large as the face in b-rep models [1]. erefore, it is imperative to introduce model segmentation, where models are divided into several model components with some basic shape features, replacing triangles or faces.…”

“…Traditional segmentation methods are primarily used for mesh models instead of general mechanical CAD models [1]. eir core idea is to divide the model surface into a group of connected subgrids with a simple shape, i.e., by calculating the discrete curvature [2,3].…”