海上夜间飞行的实时仿真

Real-time visual system of night-flying across the sea

自然场景仿真是虚拟现实技术的重要部分,夜间海上飞行时,星空、月亮以及海面的倒影是独具特色的自然场景.为营造沉浸感强的夜海飞行虚拟现实系统,用粒子系统实现了星空的模拟,将星体动态闪烁现象演化为粒子生命的概念,并按照主导算法加扰动的思想实现星空随机性模拟;用特殊纹理融合算法模拟月亮及星月在海面的镜像,特殊纹理经过制作、着色和融合3个过程,并根据夜空景像在海面倒影的亮度衰减规律确定融合因子,将纹理和背景按照融合因子进行深度融合;最终实现了较逼真的夜海飞行虚拟现实系统.

The natural scene simulation is a key technology in the field of virtual reality. Stars, the moon and their mirror images in water are all special natural scenes when pilots flying across the sea. In order to generate a high quality night flying virtual reality system, a particle system was adopted for star simulation, the dynamic twinkling phenomenon of stars was deduced to the concept of particle life, and a dominant algorithm appending random disturbance method was presented for simulating the night sky. An efficient texture blending method was introduced for simulating the moon and the mirror of night sky. The special texture was made up of three steps, such as texture-generating, scene-rendering and graph-blending. The blending gene parameters were confirmed according to light attenuation criterion of reflecting mirror and textures were blended with the background screen using the alpha method. Finally, a high quality virtual reality system of night flying over the sea was implemented.