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Hierarchical Lighting Simulation for Outdoor Scenes

  • Katja Daubert
  • Hartmut Schirmacher
  • François X. Sillion
  • George Drettakis
  • iMAGIS
Part of the Eurographics book series (EUROGRAPH)

Abstract

Lighting algorithms for outdoor scenes suffer from the sheer geometric and lighting complexity of such environments. In this paper we introduce an effi­cient, hierarchical solution to the problem of outdoor illumination. Data structures and sampling algorithms are presented, permitting the integration of complex and natural objects in a hierarchical radiosity simulation system. This new approach allows the hierarchical simulation of radiant energy exchanges in outdoor scenes for the first time, including terrain and botanical models as well as sunlight and skylight. This is accomplished by providing the necessary tools to treat terrain meshes as a hierarchy of light-exchanging objects, as well as an efficient hierar­chical representation for the sky dome. In addition, refinement criteria are adapted to the particular characteristics of natural lighting. Results of our implementation are presented including naturally-lit images of terrain-maps, trees and buildings.

Keywords

Global Illumination Outdoor Scene Lighting Simulation Generic Edge External Light Source 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag/Wien 1997

Authors and Affiliations

  • Katja Daubert
    • 1
    • 2
  • Hartmut Schirmacher
    • 1
    • 2
  • François X. Sillion
    • 1
  • George Drettakis
    • 1
  • iMAGIS
    • 1
    • 3
  1. 1.Laboratoire GRAVIR/IMAG-INRIAFrance
  2. 2.Computer Graphics GroupUniversity of Erlangen-NurembergGermany
  3. 3.CNRS/INRIA/INPG/UJFGrenoble Cedex 9France

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