Objective To study the optimized method for precise modeling of virtual device, while using virtual reality in the simulation training of space flight.
研究在应用虚拟现实进行航天飞行模拟训练时，虚拟设备精确建模的实现与优化方法。
The research of the virtual crop is in the forward position of crop simulation study at present, and has broad prospects of application.
虚拟作物是目前作物模拟研究的前沿，具有广泛的应用前景。
In order to get stable and natural gait of numerical man with lower exoskeleton in the dynamic simulation of virtual man-machine system, the study of gait planning methods is required.
穿戴下肢外骨骼的数字人在虚拟人机系统运动仿真中应具有稳定自然的步态，因此需要研究步态规划方法。
Now better fog effect has been gained in practice and the archivement has far-reaching significance to the study of the fog simulation in 3D virtual scene.
在目前的实际应用中，我们已经取得了较好的雾化效果，这对虚拟场景中雾的模拟的研究有着深远的意义。
The study found that both at home and abroad, the current situation of support tools mostly in three ways, namely: the website or project site, The virtual simulation software, Special courseware.
综合国内外的研究现状发现，当前的探究支撑工具大多以三种方式，也即：网站或专题网站；虚拟仿真软件；专题课件。
At last, a case study of virtual maintenance simulation demonstration is conducted. The results of simulation experiments indicate the effectiveness and usability of the proposed method.
最后，设计实现了一个典型工作环境下的仿真演示实例，仿真和试验结果表明了所提算法的可行性与实用性。
At last, a case study of virtual maintenance simulation demonstration is conducted. The results of simulation experiments indicate the effectiveness and usability of the proposed method.
最后，设计实现了一个典型工作环境下的仿真演示实例，仿真和试验结果表明了所提算法的可行性与实用性。
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