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Modeling and rendering of metallic patinas
SIGGRAPH '96 Proceedings of the 23rd annual conference on Computer graphics and interactive techniques
Flow and changes in appearance
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Monte Carlo evaluation of non-linear scattering equations for subsurface reflection
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Proceedings of the 28th annual conference on Computer graphics and interactive techniques
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GRIN'01 No description on Graphics interface 2001
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Rendering of clean transparent objects has been well studied in computer graphics. However, real-world transparent objects are seldom clean—their surfaces have a variety of contaminants such as dust, dirt, and lipids. These contaminants produce a number of complex volumetric scattering effects that must be taken into account when creating photorealistic renderings. In this paper, we take a step toward modeling and rendering these effects. We make the assumption that the contaminant is an optically thin layer and construct an analytic model following results in radiative transport theory and computer graphics. Moreover, the spatial textures created by the different types of contamination are also important in achieving visual realism. To this end, we measure the spatially varying thicknesses and the scattering parameters of a number of glass panes with various types of dust, dirt, and lipids. We also develop a simple interactive synthesis tool to create novel instances of the measured contamination patterns. We show several results that demonstrate the use of our scattering model for rendering 3D scenes, as well as modifying real 2D photographs.