Precomputed Radiance Transfer Field for Rendering Interreflections in Dynamic Scenes
Precomputed Radiance Transfer Field for Rendering Interreflections in Dynamic Scenes
复制标题
用于渲染动态场景中相互反射的预计算辐射传输场
DOI：
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发表时间：
2007
期刊：
影响因子：
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通讯作者：
H. Bao
中科院分区：
文献类型：
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作者：
Minghao Pan;Rui Wang;Xinguo Liu;Qunsheng Peng;H. Bao
本文介绍了一种新的表示方法--辐射度传输场(RTF)，用于在低频光照下渲染动态场景中的交互反射。RTF描述了单个物体传递到其周围空间的辐射作为入射辐射的函数。RTF的一个重要特性是它独立于场景配置，可以在动态场景中进行互反射计算。其次，RTF自然符合预计算阴影场的渲染框架，增加交互反射效果的成本可以忽略不计。此外，RTF可用于计算漫反射和光泽对象的互反射。实验还表明，聚类主成分分析(CPCA)可以对RTF数据进行高度压缩，这不仅降低了内存开销，而且加快了渲染速度。最后，我们给出了一些实验结果来演示我们的技术。
In this paper, we introduce a new representation – radiance transfer fields (RTF) – for rendering interreflections in dynamic scenes under low frequency illumination. The RTF describes the radiance transferred by an individual object to its surrounding space as a function of the incident radiance. An important property of RTF is its independence of the scene configuration, enabling interreflection computation in dynamic scenes. Secondly, RTFs naturally fit in with the rendering framework of precomputed shadow fields, incurring negligible cost to add interreflection effects. In addition, RTFs can be used to compute interreflections for both diffuse and glossy objects. We also show that RTF data can be highly compressed by clustered principal component analysis (CPCA), which not only reduces the memory cost but also accelerates rendering. Finally, we present some experimental results demonstrating our techniques.