关键词: 重要性面片采样, 全局光照, 遮挡, 图形处理器, 统一计算架构

Abstract: This paper presents a real-time global illumination computation method.One-bound indirect illumination can be computed by this method in dynamic light source and dynamic view point environment，and the materials of object surface can be modified in real-time.This method pre-computes the form factor of all faces to solve the occlusion problem and records some importance faces with larger form factor as indirect light sources.During the real-time rendering，the method generates an extend shadow map of the scene through the direction of light source，which records the id and flux of the faces，and then computes indirect illumination from the sampled indirect light sources.The whole indirect illumination computation is implemented in GPU using CUDA，so this method can render the static scene in real-time and reach the realistic result.

Key words: importance faces sampling, global illumination, occlusion, Graphic Processing Unit（GPU）, Compute Unified Device Architecture（CUDA）