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Research Papers

Triangular Mesh and Boundary Representation Combined Approach for 3D CAD Lightweight Representation for Collaborative Product Development

[+] Author and Article Information
Cong Hong Phong Nguyen

3D Digital Engineering Laboratory,
Department of Mechanical Engineering,
Graduate School,
Chung-Ang University,
Seoul 06974, South Korea
e-mail: hphong1990@cau.ac.kr

Young Choi

3D Digital Engineering Laboratory,
School of Mechanical Engineering,
College of Engineering,
Chung-Ang University,
Seoul 06974, South Korea
e-mail: yychoi@cau.ac.kr

1Corresponding author.

Contributed by the Computers and Information Division of ASME for publication in the JOURNAL OF COMPUTING AND INFORMATION SCIENCE IN ENGINEERING. Manuscript received July 23, 2018; final manuscript received October 9, 2018; published online November 19, 2018. Assoc. Editor: Charlie C.L. Wang.

J. Comput. Inf. Sci. Eng 19(1), 011009 (Nov 19, 2018) (11 pages) Paper No: JCISE-18-1181; doi: 10.1115/1.4041777 History: Received July 23, 2018; Revised October 09, 2018

The lightweight representation of three-dimensional computer-aided design (3D CAD) models has drawn much attention from researchers as its usefulness in collaborative product development is vast. Existing approaches are mostly based on feature depression or mesh-based simplification. In this article, a new approach for 3D CAD lightweight representation based on combining triangular mesh representation and boundary representation (B-rep) is proposed. The corresponding data structure as well as the conversion method from original data given in B-rep was developed. Considered as an essential application in collaborative product development, a case study on the visualization process of large-scale assembly models represented in the proposed lightweight representation was also conducted. The validation of the approach was performed via experiments with 3D CAD models in SAT format and by benchmarking with the conventional all-faceted approach with the same level of mesh resolution.

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Figures

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Fig. 1

Related approaches to lightweight representation of 3D CAD

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Fig. 2

The size difference of a 3D model represented in B-rep and mesh representation

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Fig. 3

Approaches for 3D data representation in the combined mesh and B-rep combined model

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Fig. 4

Proposed mesh and B-rep combined representation data structure

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Fig. 5

The three different 3D model representation schemes: (a) mesh representation, (b) B-rep, and (c) mesh and B-rep combined

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Fig. 6

The proposed lightweight file structure and its representation in XML format

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Fig. 7

Lightweight format conversion process from B-rep data

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Fig. 8

Visualization pipeline of the mesh and B-rep combined model

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Fig. 9

Test model visualizations: (a) test model 1—the Bulldozer, (b) test model 2—the sand filter system, and (c) test model 3—the jet engine

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Fig. 10

Adjusted visualization pipeline

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