The Open Cybernetics & Systemics Journal

2015, 9 : 2339-2343
Published online 2015 October 19. DOI: 10.2174/1874110X01509012339
Publisher ID: TOCSJ-9-2339

Geometry Modeling for Virtual Reality Based on CAD Data

Yong Tang , Yan Xu and Li-li Yuan
College of Automobile and Traffic Engineering, Nanjing Forestry University, Nanjing, 210037, P.R. China; Nanjing, 201137, P.R. China.

ABSTRACT

In order to satisfy the requirement of geometry modeling for virtual reality system, this study processed a modeling method based on CAD data. Firstly, the media file that is exported from the CAD data was parsed to gain the mesh data. Following this, the mesh data was simplified through the improved quadric error metrics algorithm, to obtain a better shape of triangle. At last, the mesh data was analyzed to establish a standard virtual reality model with Level of Details via OpenFlight API. Experiments showed that the triangular mesh shape obtained by using the proposed algorithm is more reasonable than QEM algorithm, but had higher quality of rendering. With extensive simplification, rendering frame rate and loading efficiency of model were observed to be highly improved, and visualization of the virtual reality model experienced almost no change, which will be sufficient to meet the demand of virtual reality system.

Keywords:

Virtual reality, CAD data, Quadric error metrics, Mesh simplification, Model conversion.