基于几何建模的旗帜飘动模拟研究与实现

摘要

In order to enhance the immersion of virtual reality system, it is often necessary to simulate various natural phenomenon or some specific physical models in the virtual scene.Flag simulation is a branch of virtual reality technology simulation.Therefore, the study of flag simulation in virtual reality system has certain significance for the development of virtual reality technology.In order to simulate the dynamic effect of the flag fluttering under the wind, we propose a method of fast construction of the flag surface based on geometric modeling.This method utilizes sine/exponential function model to rapidly build and district flag surface grids.Then by using different refresh frequency, it controls the speed of the flag surface movement, showing the simulation effect of the flag surface movement under the wind.At last, the final effect is rendered by texture mapping, color fusion and lighting technology.Experiment shows that the proposed method is easy to implement with low memory consumption, which can achieve dynamic and vivid fidelity of continuous jitter effect of the flag.%为了增强虚拟现实系统的沉浸感, 常常需要在虚拟场景中模拟各种自然现象或者一些特定的物理模型, 旗帜模拟属于虚拟现实技术模拟中的一个分支.因此, 研究虚拟现实系统中旗帜模拟对于虚拟现实技术的发展具有一定的意义.为了真实地模拟旗帜在风力作用下飘动的动态效果, 提出了一种基于几何建模方式快速构建旗帜表面的方法.该方法利用正弦/指数函数模型快速构造旗帜表面网格, 将旗面网格进行分区, 然后采用不同的刷新频率控制旗面运动速度, 呈现出风力作用下旗帜表面运动模拟效果, 最后通过纹理映射、色彩融合以及光照技术渲染出最终效果.实验结果表明, 基于几何建模方式实现旗帜模拟具有实现简单, 内存消耗小等优点, 可以实现富有动感且视觉逼真的旗帜连续抖动效果.