Algorithms for Spherical Harmonic Lighting

Ian Lisle, Tracy Huang

Research output: A Conference proceeding or a Chapter in BookConference contributionpeer-review

8 Citations (Scopus)
52 Downloads (Pure)


Spherical harmonic (SH) lighting models require efficient and general libraries for evaluation of SH functions and of Wigner matrices for rotation. We introduce an efficient algebraic recurrence for evaluation of SH functions, and also implement SH rotation via Wigner matrices constructed for the real SH basis by a recurrence. Using these algorithms, we provide a freely distributable C / OpenGL implementation for SH diffuse unshadowed, shadowed and inter-reflected models. Our implementation allows flexible switching of scene, light probe, SH degree and lighting model at run time.
Original languageEnglish
Title of host publicationGRAPHITE 2007: Proceedings of the 5th International Conference on Computer Graphics and Interactive Techniques in Australia and Southeast Asia
EditorsS Spencer
Place of PublicationNew York
PublisherAssociation for Computing Machinery (ACM)
Number of pages4
ISBN (Print)9781595939128
Publication statusPublished - 2007
EventGRAPHITE 2007 - Perth, Australia
Duration: 1 Dec 20074 Dec 2007


ConferenceGRAPHITE 2007


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