【SIGGRAPH Asia 2012专题*技术论文】材料和图像：高光泽材料的交互式双尺度编辑

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【SIGGRAPH Asia 2012专题*技术论文】
材料和图像：高光泽材料的交互式双尺度编辑
Interactive Bi-scale Editing of Highly Glossy Materials
Kei Iwasaki, Yoshinori Dobashi, Tomoyuki Nishita 摘要：提出了一种新的技术双尺度材料编辑使用球形高斯（认证）。代表大型，有效的双向反射分布函数，平均重flectance小细节是用。有效的双向反射分布函数的计算是从整体的产品的双向可视正态分布（bvndf）和brdfs小型几何。我们的方法是bvndf与一笔奖学金，它可以计算在fl交互编辑，使小型几何。由代表小型brdfs与一笔奖学金，有效brdfs可以计算分析卷积为bvndf和双向认证。我们提出了一种新的秘书长代表基于卷积双通，可以实时渲染下有效brdfs全环境照明和小型brdfs实时编辑。与以往的方法，我们的方法并不需要大量的预计算时间与大体积算数据单，这使得有可能实现的方法在一个图形，从而实时渲染。 Abstract：We present a new technique for bi-scale material editing using Spherical Gaussians (SGs). To represent large-scale appearances, an effective BRDF that is the average reflectance of small-scale details is used. The effective BRDF is calculated from the integral of the product of the Bidirectional Visible Normal Distribution (BVNDF) and BRDFs of small-scale geometry. Our method represents the BVNDF with a sum of SGs, which can be calculated on-the-fly, enabling interactive editing of small-scale geometry. By representing small-scale BRDFs with a sum of SGs, effective BRDFs can be calculated analytically by convolving the SGs for BVNDF and BRDF. We propose a new SG representation based on convolution of two SGs, which allows real-time rendering of effective BRDFs under all-frequency environment lighting and real-time editing of small-scale BRDFs. In contrast to the previous method, our method does not require extensive precomputation time and large volume of precomputed data per single BRDF, which makes it possible to implement our method on a GPU, resulting in real-time rendering.
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