Interactive summed-area table generation for glossy environmental reflections
Interactive summed-area table generation for glossy environmental reflections
复制标题
用于光泽环境反射的交互式求和面积表生成
DOI：
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发表时间：
2005
期刊：
影响因子：
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通讯作者：
A. Lastra
中科院分区：
文献类型：
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作者：
J. Hensley;T. Scheuermann;Montek Singh;A. Lastra
在计算机图形学中有许多应用，其中空间变化滤波器是有用的。一个示例是光泽反射的渲染。与完全反射材质不同，完全反射材质只需要反射向量方向上的单个辐射率采样，而光泽材质需要在立体角上进行积分。通过使用依赖于表面的BRDF的支持来过滤反射图像的模糊可以近似这种效果。目前，这是通过离线预过滤来完成的，这将该技术限制在静态环境中。Crow [1984]引入了面积和表，以实现比mip贴图更通用的纹理过滤。一旦生成，求和面积表提供了一种方法来评估具有恒定数量的纹理读取的空间变化的框过滤器。
There are many applications in computer graphics where spatially varying filters are useful. One example is the rendering of glossy reflections. Unlike perfectly reflective materials, which only require a single radiance sample in the direction of the reflection vector, glossy materials require integration over a solid angle. Blurring by filtering the reflected image with a support dependent on the surface‘s BRDF can approximate this effect. This is currently done by pre-filtering off-line, which limits the technique to static environments. Crow [1984] introduced summed-area tables to enable more general texture filtering than was possible with mip maps. Once generated, a summed-area table provides a means to evaluate a spatially varying box filter with a constant number of texture reads.