“Real-time wavelength-dependent rendering pipeline” by Lindsay and Agu

  • ©Clifford Lindsay and Emmanuel Agu

  • ©Clifford Lindsay and Emmanuel Agu

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Title:

    Real-time wavelength-dependent rendering pipeline

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Abstract:


    Iridescent colors such as diffraction, thin film interference, dispersive refraction and scattering are produced by wavelength dependent Bi-directional Reflectance Distribution Functions (BRDFs). Due to expensive per-wavelength sampling required, rendering wavelength-dependent BRDFs have historically been restricted to offline rendering techniques or real-time techniques that use color ramps and simplified BRDFs. We present a generalized real-time pipeline for physically accurate wavelength dependent phenomena that is independent of sampling cost, uses a wavelength-based color, and supports High Dynamic Range (HDR). Our pipeline converts the lighting environment and BRDF to per-wavelength Spherical Harmonics (SH) coefficients, rotates and uploads them to the rendering framework, then interactively renders the lighting integral with traditional scene geometry.

References:


    1. Lindsay, C., and Agu, E., 2005. Wavelength dependent rendering using spherical harmonics, in Proc. Eurographics, July.


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