Fast Global Illumination with Discrete Stochastic Microfacets Using a Filterable Model
Fast Global Illumination with Discrete Stochastic Microfacets Using a Filterable Model
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DOI：
10.1111/cgf.13547
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发表时间：
2018-10
影响因子：
2.5
通讯作者：
Beibei Wang;Lu Wang-;Nicolas Holzschuch
中科院分区：
文献类型：
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作者：
Beibei Wang;Lu Wang-;Nicolas Holzschuch
许多现实生活中的材料都具有闪闪发光的外观，无论是设计原因还是本质原因。例如金属涂料、闪闪发光的清漆以及雪。这些闪光对应于在材料表面或嵌入材料内部沿特定方向反射光的小而孤立的闪亮颗粒。造成这些闪光的粒子通常很小且不连续。这些特性使得很难将它们有效地集成到标准渲染管道中，特别是对于间接照明。现有方法使用 4 维层次结构，在空间和方向上同时搜索光反射粒子。该方法是准确的，但仍然昂贵。在本文中，我们证明这种 4 维搜索可以使用单独的 2 维步骤来近似。这种近似允许快速集成大足迹的闪烁贡献，从而将与闪烁相关的额外成本降低一个数量级。
Many real‐life materials have a sparkling appearance, whether by design or by nature. Examples include metallic paints, sparkling varnish but also snow. These sparkles correspond to small, isolated, shiny particles reflecting light in a specific direction, on the surface or embedded inside the material. The particles responsible for these sparkles are usually small and discontinuous. These characteristics make it difficult to integrate them efficiently in a standard rendering pipeline, especially for indirect illumination. Existing approaches use a 4‐dimensional hierarchy, searching for light‐reflecting particles simultaneously in space and direction. The approach is accurate, but still expensive. In this paper, we show that this 4‐dimensional search can be approximated using separate 2‐dimensional steps. This approximation allows fast integration of glint contributions for large footprints, reducing the extra cost associated with glints be an order of magnitude.