Image-Guided Weathering: A New Approach Applied to Flow Phenomena

The simulation of weathered appearance is essential in the realistic modeling of urban environments. A representative and particularly difficult effect to produce on a large scale is the effect of fluid flow. Changes in appearance due to flow are the result of both the global effect of large-scale shape, and local effects, such as the detailed roughness of a surface. With digital photography and Internet image collections, visual examples of flow effects are readily available. These images, however, mix the appearance of flows with the specific local context. We present a methodology to extract parameters and detail maps from existing imagery in a form that allows new target-specific flow effects to be produced, with natural variations in the effects as they are applied in different locations in a new scene. In this paper, we focus on producing a library of parameters and detail maps for generating flow patterns – and this methodology can be used to extend the library with additional image exemplars. To illustrate our methodology, we show a rich collection of patterns applied to urban models.

@Article{BLRDD11,
  author       = "Bosch, Carles and Laffont, Pierre-Yves and Rushmeier, Holly and Dorsey, Julie and Drettakis, George",
  title        = "Image-Guided Weathering: A New Approach Applied to Flow Phenomena",
  journal      = "ACM Transactions on Graphics",
  year         = "2011",
  note         = "(Accepted; To appear at SIGGRAPH 2011)",
  url          = "http://www-sop.inria.fr/reves/Basilic/2011/BLRDD11"
}