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Mathematical Problems in Engineering
Volume 2017, Article ID 5818627, 12 pages
https://doi.org/10.1155/2017/5818627
Research Article

Generating Free-Form Grid Truss Structures from 3D Scanned Point Clouds

1Department of Civil Engineering, Zhejiang University, A-818 Anzhong Building, 866 Yuhangtang Road, Hangzhou, Zhejiang 310058, China
2Housing and Construction Bureau of Futian District, Shenzhen, Guangdong 518048, China
3Department of Civil Engineering, Zhejiang University, A-823 Anzhong Building, 866 Yuhangtang Road, Hangzhou, Zhejiang 310058, China

Correspondence should be addressed to Xian Xu; nc.ude.ujz@ux_naix

Received 8 December 2016; Revised 5 August 2017; Accepted 13 August 2017; Published 20 September 2017

Academic Editor: Muhammad N. Akram

Copyright © 2017 Hui Ding et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Reconstruction, according to physical shape, is a novel way to generate free-form grid truss structures. 3D scanning is an effective means of acquiring physical form information and it generates dense point clouds on surfaces of objects. However, generating grid truss structures from point clouds is still a challenge. Based on the advancing front technique (AFT) which is widely used in Finite Element Method (FEM), a scheme for generating grid truss structures from 3D scanned point clouds is proposed in this paper. Based on the characteristics of point cloud data, the search box is adopted to reduce the search space in grid generating. A front advancing procedure suit for point clouds is established. Delaunay method and Laplacian method are used to improve the quality of the generated grids, and an adjustment strategy that locates grid nodes at appointed places is proposed. Several examples of generating grid truss structures from 3D scanned point clouds of seashells are carried out to verify the proposed scheme. Physical models of the grid truss structures generated in the examples are manufactured by 3D print, which solidifies the feasibility of the scheme.