Modeling and rendering of metallic patinas

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Abstract
An important component that has been missing from image synthe- sis is the effect of weathering. In this paper, we present an approach for the modeling and rendering of one type of weathering — metal- lic patinas. A patina is a film or incrustation on a surface that is produced by the removal of material, the addition of material, or the chemical alteration of a surface. Oxidation, sulphidization, and painting are examples of phenomena that produce patinas. We represent a surface as a series of layers. Patinas are simulated with a collection of operators, such as "coat," "erode," and "pol- ish," which are applied to the layered structure. The development of patinas is modulated according to an object's geometry and lo- cal environmental factors. We introduce a technique to model the reflectance and transmission of light through the layered structure using the Kubelka-Munk model. This representation yields a model that can simulate many aspects of the time-dependent appearance of metals as they are exposed to the atmosphere or treated chemically. We demonstrate the approach with a collection of copper models. CR Categories and Subject Descriptors: I.3.7 (Computer Graph- ics): Three-Dimensional Graphics and Realism I.3.6 (Computer Graphics): Methodology and Techniques.

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