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LinSSS: linear decomposition of heterogeneous subsurface scattering for real-time screen-space rendering
The Visual Computer ( IF 3.5 ) Pub Date : 2020-07-28 , DOI: 10.1007/s00371-020-01915-4
Tatsuya Yatagawa , Yasushi Yamaguchi , Shigeo Morishima

Screen-space subsurface scattering is currently the most common approach to represent translucent materials in real-time rendering. However, most of the current approaches approximate the diffuse reflectance profile of translucent materials as a symmetric function, whereas the profile has an asymmetric shape in nature. To address this problem, we propose LinSSS, a numerical representation of heterogeneous subsurface scattering for real-time screen-space rendering. Although our representation is built upon a previous method, it makes two contributions. First, LinSSS formulates the diffuse reflectance profile as a linear combination of radially symmetric Gaussian functions. Nevertheless, it can also represent the spatial variation and the radial asymmetry of the profile. Second, since LinSSS is formulated using only the Gaussian functions, the convolution of the diffuse reflectance profile can be efficiently calculated in screen space. To further improve the efficiency, we deform the rendering equation obtained using LinSSS by factoring common convolution terms and approximate the convolution processes using a MIP map. Consequently, our method works as fast as the state-of-the-art method, while our method successfully represents the heterogeneity of scattering.

中文翻译:

LinSSS:用于实时屏幕空间渲染的异构次表面散射的线性分解

屏幕空间次表面散射是当前在实时渲染中表示半透明材质的最常用方法。然而,大多数当前方法将半透明材料的漫反射曲线近似为对称函数,而该曲线在本质上具有不对称形状。为了解决这个问题,我们提出了 LinSSS,这是一种用于实时屏幕空间渲染的异构次表面散射的数值表示。尽管我们的表示建立在先前的方法之上,但它有两个贡献。首先,LinSSS 将漫反射曲线表示为径向对称高斯函数的线性组合。然而,它也可以代表轮廓的空间变化和径向不对称。其次,由于 LinSSS 仅使用高斯函数进行公式化,漫反射曲线的卷积可以在屏幕空间中有效地计算。为了进一步提高效率,我们通过分解公共卷积项和使用 MIP 映射近似卷积过程来变形使用 LinSSS 获得的渲染方程。因此,我们的方法与最先进的方法一样快,而我们的方法成功地代表了散射的异质性。
更新日期:2020-07-28
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