基于球面调和函数的环境映射技术

Environment mapping technology based on spherical harmonics function

摘要:

针对三维虚拟场景的光照一致性问题，以提高场景的真实感为目的，研究了一种基于环境映射的光照技术。此方法采用全景辐射度图对场景进行照明，并利用球面调和函数近似估计理想漫反射物体表面的光亮度，同时添加了漫反射阴影交互转移，实现了低频光照环境下漫反射物体捕获软阴影的实时渲染。实验结果表明，算法绘制质量高，具有一定的实用价值。

Abstract:

Focusing on the illumination coherence problem of the three-dimensional virtual scene, this study analyzed the environment mapping technology to improve the sense of reality. The light probe image was used to light the scene and the irradiance of the diffuse surface was approximated by using spherical harmonics function. By considering the shadowed diffuse transfer simultaneously, the soft shadow of diffuse objects was generated successfully under dynamic, low-frequency lighting environments. The experiment results showed that this algorithm approached accurately with high quality.