Irradiance gradients

@inproceedings{Ward2008IrradianceG,
  title={Irradiance gradients},
  author={Gregory J. Ward and Paul S. Heckbert},
  booktitle={SIGGRAPH '08},
  year={2008}
}
A new method for improving the accuracy of a diffuse interreflection calculation is introduced in a ray tracing context. The information from a hemispherical sampling of the luminous environment is interpreted in a new way to predict the change in irradiance as a function of position and surface orientation. The additional computation involved is modest and the benefit is substantial. An improved interpolation of irradiance resulting from the gradient calculation produces smoother, more… CONTINUE READING
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