关键词: 图形处理器, 粒子系统, 视点坐标系, 几何着色器, 雨雪场景

Abstract: Three-dimensional effect of rain and snow scenery realized by means of particle system can be greatly enhanced. Traditionally, the particle system based on CPU will occupy a considerable amount of CPU operation time so that it is hard to satisfy the need of realtime simulation. To resolve this problem, a particle system based on GPU was put forward to simulate rain and snow scenery. In this system, dead time particles were reused to form new particles in the eye coordinates. In the meantime, point position of particles was transformed to rectangle position in the Geometry Shader, so as to relieve CPU from the complex voluminous geometry operation. The number of particles in the scenery was largely increased, and thus enhancing the realtime effect and fidelity of the simulation.

Key words: Graphic Processing Unit (GPU), particle system, view coordinate, geometry shader, rain and snow scene