Abstract: Weathering modeling introduces blemishes such as dirt, rust, cracks and scratches to virtual scenery. In this paper we present a visual stimulation technique that works well for a wide variety of weathering phenomena. Our technique, called gamma-ton tracing, is based on a type of aging-inducing particles called gamma-tons. Modeling a weathering effect with gamma-ton tracing involves tracing a large number of gamma-tons through the scene in a way similar to photon tracing and then generating the weathering effect using the recorded gamma-ton transport information. With this technique, we can produce weathering effects that are customized to the scene geometry and tailored to the weathering sources. Several effects that are challenging for existing techniques can be readily captured by gamma-ton tracing. These include global transport effects. or "stainbleeding." gamma-ton tracing also enables visual simulations of complex multi-weathering effects. Lastly gamma-ton tracing can generate weathering effects that not only involve texture changes but also large-scale geometry changes. We demonstrate our technique with a variety of examples.