摘要
为了提高三维场景中烟雾模拟的真实性,以粒子系统为基础,对烟雾的运动模型与渲染方法进行了研究。为模拟烟雾扩散特性,提出预定义扩散范围的方法来近似控制烟雾的整体扩散区域,并通过线性增大粒子半径来模拟烟雾粒子的自身扩散。在烟雾运动过程中,基于动力学原理,建立了一种较准确的烟雾运动模型,并分析了烟雾粒子扩散过程中风对粒子的影响。在渲染时,为避免传统粒子系统渲染出的颜色过于平滑,利用图形处理器可编程特性,引入法线贴图计算粒子表面的散射光叠加到粒子本身颜色上,增加了烟雾的层次感和颗粒感。实验结果表明,该实现方法粒子运动更加真实,视觉效果更加逼真。
In order to improve the realism of the simulation of smoke, the movement model of smoke and the rendering methods based on particle system are studied. To simulate the diffusion of smoke, an approach ofpre-defined diffuse range is presented to approximate the area of smoke diffusion, and linear increase of particle radius to simulate the self-diffusion of smoke particle. In the process of smoke movement, a more accurate model of the smoke movement is created based on physical dynamics, and the impact of wind on the particles is analyzed in the process of smoke diffusion. In rendering, in order to avoid the flat-looking of traditional particle rendering, the diffuse lighting color that is calculated by using a normal texture in GPU programs is blended with the origin color of the particle surface, the detail of the smoke is enhanced. The result of experiments show that the movement of particle is more accurate and the visual effects is more realistic.
出处
《计算机工程与设计》
CSCD
北大核心
2010年第22期4855-4857,4928,共4页
Computer Engineering and Design
基金
国家863高技术研究发展计划基金项目(2009AA01Z332)
国家自然科学基金项目(60903118
60832011)
