Spherical harmonic Gradients for Mid-Range Illumination

@inproceedings{Annen2004SphericalHG,
  title={Spherical harmonic Gradients for Mid-Range Illumination},
  author={Thomas Annen and Jan Kautz and Fr{\'e}do Durand and Hans-Peter Seidel},
  booktitle={Rendering Techniques},
  year={2004}
}
Spherical harmonics are often used for compact description of incident radiance in low-frequency but distant lighting environments. For interaction with nearby emitters, computing the incident radiance at the center of an object only is not sufficient. Previous techniques then require expensive sampling of the incident radiance field at many points distributed over the object. Our technique alleviates this costly requirement using a first-order Taylor expansion of the spherical-harmonic… CONTINUE READING
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