基于光辐射预计算的场景实时绘制算法

Real-time rendering algorithm of scene based on precomputed radiance transfer

光辐射传输预计算对于提高场景绘制效果很关键。对光辐射传输预计算进行了研究,提出了一种基于SH的光辐射传输预计算的算法,在低频环境光照条件下实时生成漫反射物体。将光源分布函数和光辐射传输函数分别用SH进行分解,则出射光强为两者生成的系数向量点积。绘制的场景中包含了阴影,相互反射等全局光照效果。实验结果表明算法逼近程度好,绘制质量高,具有一定的实用价值。

precomputed radiance transfer is an important aspect to improve the reality of scenes.In this paper,it analyzes the algorithm of precomputed the radiance transfer and points out a real-time rendering algorithm of static scene based on precomputed radiance transfer.Use spherical harmonics to project the incident lighting and radiance transfer,then the exit radiance is the product of the resulting vertexes’coefficients,considering the shadows and interreflections simultaneously.Experimental results demonstrate that the algorithm approaches accurately with high quality and have some utility.