@inproceedings{1994-reinhard,
  title={Environment Mapping for Efficient Sampling of the Diffuse Interreflection},
  author={Erik Reinhard and Lucas U. Tijssen and Frederik W. Jansen},
  Booktitle={Photorealistic Rendering Techniques},
  ISBN={3-540-58475-7},
  publisher={Springer-Verlag},
  pages={410--422},
  month={June},
  year={1994},
  keywords={Graphics},
  abstract={Environment mapping is a technique to compute specular
reflections for a glossy object. Originally proposed as a cheap alternative
for ray tracing, the method is well suited to be incorporated in a
hybrid rendering algorithm. In this paper environment mapping is introduced
to reduce the amount of computations involved in tracing sec-ondary
rays. During rendering, instead of tracing the secondary rays all through
the scene, values are taken from the maps for the rays that would otherwise
hit distant ob-jects. This way the quality of the image is retained
while providing a cheap alternative to stochastic brute force sampling
methods. An additional advantage is that due to the local representation
of the entire 3D scene in a map, parallelising this algorithm should
result in a good speed-up and high efficiency.},
  source={tech-reports/1994/1994-reinhard.pdf},
  pubtype={4}
}