A Combined Approach to Subsurface Scattering-Draft
نویسنده
چکیده
Current techniques for rendering multilayered translucent materials such as skin, marble, jade, and paper can achieve startling realism by modeling subsurface scattering. However, due to performance concerns, all of these techniques require fixing the material properties, including the depth and scattering parameters of each layer, before rendering begins. This makes it impractical to calculate scattering profiles on a per pixel basis to render objects that have spatially varying parameters. We introduce a new method that combines ideas from two techniques to enable the rendering of multilayered materials with spatially varying parameters. Specifically, we combine hierarchical integration with a sum of Gaussians approximation of subsurface scattering diffusion profiles. This speeds up the process of computing the interactions between individual layers by orders of magnitude, allowing parameters to vary across the surface. We show that this technique allows for rendering of translucent materials with spatially varying properties with relatively low overhead.
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