Three-Dimensional Modeling of Virtual Training System for Construction Machinery
Xiaoqiang Yang, Jinhua Han, Hongewi Li

Abstract
The construction and optimization of the three dimensional model of construction machinery are presented in this work. The decomposition hierarchical structure model of excavator, a kind of typical construction machinery, is accomplished. The reconstruction method for three views of machine parts is proposed based on rapid 3D surface fitting as well as NURBS composite surface. On the other hand, the optimization of 3D model is addressed in detail. The optimizing process of 3D model of construction machinery is first presented. Then the structure optimizing method and model optimizing method are introduced respectively. The essential principle of scene blocking, structure adjustment and some key technologies of structure optimization are demonstrated. Accounting for model optimization involves deleting redundant polygons, rational use of texture, instantiation LOD and external importing techniques. The study on resuming the object’s properties of shape, material and surface provides visual and realistic training objects for the virtual training system.

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