三维云场景的模拟

为了模拟逼真且实时的三维云场景,把云团看成是受太阳光照射的粒子集,采用基于粒子系统的技术对三维云模型进行构建。通过比较云粒子、太阳和视点三者的关系,引入光照散射函数对云进行渲染。对现有的多重前向散射光照模型进行了简化和改进,使用纹理映射和O penGL函数进行加速。实现了三维天空背景的实时漫游。仿真结果表明,生成的三维云场景既有较好的真实感,又具有良好的实时性。

Simulation of 3D cloud scene

In order to simulate the lifelike and real-time three dimensional cloud scene,cloud was considered to be a collection of particles collecting light from the sun,and the three dimensional cloud was modeled based on the particle system.The relationship between the particles in cloud,the sun and the viewpoint was compared,and the scattering illumination model was used to render cloud.The exiting multiple forward scattering illumination models were simplified and improved, and the texture mapping and the OpenGL were used to enhance the operation speed. Finally,the roamed 3D sky background was realized.The results show that the visual effect of 3D cloud scene is true to life and real-time.