流体仿真是虚拟现实、军事仿真等领域的热点和难点。目前基于流体力学的方法计算量巨大，普通计算机难以满足实时性要求，而基于渲染的方法只能产生视觉效果，无法实现流体与物体的互动。为兼顾实时性与视觉真实性，所设计的互动数字台球系统利用改进的LBM方法对流体进行模拟。将虚拟水面投影到铺有专用幕布的台球桌上，并利用数字摄像机捕捉台球的运动轨迹。作为对水面的扰动，通过流体模拟，实现了真实台球与虚拟水面的交互，并可达到35帧以上的帧率。设计新颖合理，有很好的用户体验和娱乐效果。%Fluid simulation technology is a hot spot with many difficulties in virtual reality,military simulation,etc. The current simulation methods based on fluid mechanics need complex computation,which make real-time application impossible. In the meantime,the methods based on rendering can achieve visual effect only,but can not realize interaction of fluid with ob-jects. To achieve both real-time performance and visual reality,the interactive digital billiard system simulates fluid by an im-proved lattice Boltzmann method(LBM). First,the system projects virtual water surface onto a pool table attached with special projection screen,and then captures the movement of the billiards by a digital camera,and the disturbance on the water surface is implemented by a well developed fluid simulation method. The requirements of real-time,interaction and good visual quality are all met. The frame rate could reach more than 35. The system is well designed,which could bring much amusement to the users.
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