Making radiance and irradiance caching practical: adaptive caching and neighbor clamping
Making radiance and irradiance caching practical: adaptive caching and neighbor clamping
复制标题
使辐射率和辐照度缓存变得实用：自适应缓存和邻居钳位
DOI：
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发表时间：
2006
期刊：
影响因子：
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通讯作者：
J. Zára
中科院分区：
文献类型：
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作者：
Jaroslav Křivánek;K. Bouatouch;S. Pattanaik;J. Zára
Radiance和Irradiance缓存是一种高效的全局照明算法，它基于从稀疏的缓存值集插值间接照明。在本文中，我们提出了一种自适应算法，指导空间密度的缓存值的辐射和辐照度缓存。密度适应于间接照明的变化率，以避免可见的插值伪影并产生平滑的插值照明。此外，我们还讨论了在实现辐射和辐照度缓存中出现的一些实际问题，并提出了解决这些问题的技术。也就是说，邻居钳位启发式提出了一个强大的手段，用于检测小的间接照明源，并处理所造成的问题，通过相邻多边形之间的小间隙的光线泄漏。
Radiance and irradiance caching are efficient global illumination algorithms based on interpolating indirect illumination from a sparse set of cached values. In this paper we propose an adaptive algorithm for guiding spatial density of the cached values in radiance and irradiance caching. The density is adapted to the rate of change of indirect illumination in order to avoid visible interpolation artifacts and produce smooth interpolated illumination. In addition, we discuss some practical problems arising in the implementation of radiance and irradiance caching, and propose techniques for solving those problems. Namely, the neighbor clamping heuristic is proposed as a robust means for detecting small sources of indirect illumination and for dealing with problems caused by ray leaking through small gaps between adjacent polygons.