一个高效的动态场景算法

An Efficient Algorithm for Dynamic Scenes

为了实现动态场景下的局部光源照明,本文提出一种叫做软阴影的技术。这种技术的主要思想是预先计算每一个场景实体的阴影区域,描述实体在某点处的阴影效果。光源的阴影域称为源辐射度域,它记录了一个光源采用立方体采样向外发射的辐射图。本文提供的技术与其它软阴影生成技术有一个根本的区别:预先计算与场景结构完全独立开来。本文所提供的技术可以使实时的动态场景中产生低频的阴影效果,也能产生全频阴影。

This paper presents a soft shadow technique for dynamic scenes with moving objects under the combined illumination of moving local light sources and dynamic environment maps. The shadow field for a light source, called a source radiance field （SRF）, records radiance from an illuminant as cube maps at sampled points in its surrounding space. A fundamental difference between shadow fields can be prccomputed independent of scene configuration. The technique enables low-frequency shadowing effects in dynamic scenes in real-time and all-frequency shadows at interactive rates.