基于物理的图形建模研究

逼真性是虚拟现实的重要特性，也是虚拟现实研究的难点。基于物理的图形建模是实观虚拟环境中物体逼真运动的基本方法，它构建动画角色的动力学模型并通过仿真计算它们的运动。该方法在视频制作、虚拟仿真、虚拟漫游等领域中具有重要的应用价值。与其它运动表示方法相比，可以实现虚拟环境中多种更为逼真的物体运动效果。该文分别以不变形物体（刚体）和变性物体（柔体）为例，介绍了虚拟现实系统中实现逼真物体运动的基于物理的建模思想，分析了它们的特点以及各自存在的问题和局限性。最后指出了要想理想解决物体建模问题所必须进一步研究和突破的若干技术。

Research on Physical-based Graphics Modeling

The fidelity of virtual objects' motion is critical to a virtual environment, and is also a difficult subject in the area of virtual reality. Physical-based modeling method constructs the dynamics models of virtual objects and simulates their motion. It is of great significance in applications such as video production, virtual simulation, and virtual walkthroughs. Compared to other methods, it can improve the fidelity of virtual objects' motion greatly. In this paper, the main ideas about non-deformable and deformable virtual objects' physical-based modeling in virtual reality are introduced. The advantages, limitations of these methods are analyzed too. Finally, we also suggest some important areas for future research.