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A BRDF postprocess to integrate porosity on rendered surfaces

机译:BRDF后处理,可在渲染表面上整合孔隙率

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The behavior of light interacting with materials is a crucialnfactor in achieving a high degree of realism in image synthesis. Localnillumination processes, describing the interactions between a point ofnthe surface and a shading ray, are evaluated by bidirectionalnreflectance distribution functions (BRDFs). Current theoretical BRDFsnuse surface models restricted to roughness only, sometimes at differentnscales. We present a more complete surface micro-geometry description,nsuitable for some common surface defects, including porosity andnmicro-cracks; both of them are crucial surface features since theynstrongly influence light reflection properties. These new features arenmodeled by holes inserted in the surface profile, depending on twonparameters: the proportion of surface covered by the defects and thenmean geometric characteristic of these defects. In order to preserve thenadvantages and characteristics of existing BRDFs, a postprocessingnmethod is adopted (we integrate our technique into existing models,ninstead of defining a completely new one). Beyond providing graphicalnresults closely matching real behaviors, this method moreover opens thenway to various important new considerations in computer graphics (fornexample, changes of appearance due to the degree of humidity)
机译:光与材料相互作用的行为是在图像合成中实现高度真实感的关键因素。通过双向反射分布函数(BRDF)评估局部照明过程,该过程描述了曲面的一个点与阴影光线之间的相互作用。当前的理论BRDF只能使用表面模型,有时仅在粗糙度上使用粗糙度。我们提供了更完整的表面微观几何描述,适用于一些常见的表面缺陷,包括孔隙率和微裂纹;由于它们强烈影响光反射特性,因此它们都是至关重要的表面特征。这些新特征不是通过以下两个参数来建模的:在表面轮廓中插入孔:缺陷所覆盖的表面比例和这些缺陷的纳米几何特征。为了保留现有BRDF的优点和特性,采用了后处理方法(我们将技术集成到现有模型中,而不是定义一个全新的模型)。除了提供与实际行为紧密匹配的图形结果之外,该方法还为计算机图形学中的各种重要新考虑开辟了道路(例如,湿度引起的外观变化)

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