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We have been developing a product model and a virtual reality (VR) CAD for steel girder bridges. The previously developed model had a problem of being unable to represent elements such as flanges and webs of plate girders and being unable to define the information of connections. Further, it was impossible to select a design member by mouse clicking and it was not easy to move the viewpoint for a long distance. Therefore, in this research in order to solve these problems, the product model was modified and the VR-CAD system was improved by using Java 3D. Next, to investigate the effectiveness of the visualization of virtual reality, comparison between a 3D CAD system and VR CAD system was executed. キ ー ワー ド:プ ロ ダ ク トモ デ ル,IFC2x2,プ ロパ テ ィセ ッ ト,VR-CAD,立 体 視

Development of a Product Model for Steel Girder Bridges and VR-CAD and Investigation on the Effectiveness of Stereoscopic Vision in Virtual Reality