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Improved radiance gradient computation

Published: 12 May 2005 Publication History

Abstract

We describe a new and accurate algorithm for computing translational gradients of incoming radiance in the context of a ray tracing-based global illumination solution. The gradient characterizes how the incoming directional radiance function changes with displacement on a surface. We use the gradient for a smoother radiance interpolation over glossy surfaces in the framework of the radiance caching algorithm. The proposed algorithm generalizes the irradiance gradient computation by [Ward and Heckbert 1992] to allow its use for non-diffuse, glossy, surfaces. Compared to previous method for radiance gradient computation, the new algorithm yields better gradient estimates in the presence of significant occlusion changes in the sampled environment, allowing a smoother indirect illumination interpolation.

References

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Annen, T., Kautz, J., Durand, F., and Seidel, H.-P. 2004. Spherical harmonic gradients for mid-range illumination. In Proceedings of the Eurographics Symposium on Rendering 2004.
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Arvo, J. 1994. The irradiance jacobian for partially occluded polyhedral sources. In Proceedings of SIGGRAPH '94.
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Gautron, P., Křivánek, J., Pattanaik, S. N., and Bouatouch, K. 2004. A novel hemispherical basis for accurate and efficient rendering. In Eurographics Symposium on Rendering.
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Holzschuch, N., and Sillion, F. 1995. Accurate computation of the radiosity gradient with constant and linear emitters. In Sixth Eurographics Workshop on Rendering.
[5]
Křivánek, J., Gautron, P., Pattanaik, S., and Bouatouch, K. 2005. Radiance caching for efficient global illumination computation. Transactions on Visualization and Computer Graphics (accepted for publication). Also available as Technical Report #1623, IRISA, http://graphics.cs.ucf.edu/RCache/index.php.
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Lafortune, E. P. F., Foo, S.-C., Torrance, K. E., and Greenberg, D. P. 1997. Non-linear approximation of reflectance functions. In Proceedings of SIGGRAPH '97.
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Schröder, P., and Sweldens, W. 1995. Spherical wavelets: efficiently representing functions on the sphere. In Proceedings of SIGGRAPH, ACM Press, 161--172.
[8]
Ward, G. J., and Heckbert, P. S. 1992. Irradiance gradients. In Eurographics Workshop on Rendering.
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Ward, G. J., Rubinstein, F. M., and Clear, R. D. 1988. A ray tracing solution for diffuse interreflection. In Proceedings of SIGGRAPH '88, 85--92.
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Ward, G. J. 1992. Measuring and modeling anisotropic reflection. In Proceedings of SIGGRAPH '92, ACM Press, 265--272.
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Westin, S. H., 2000. Lafortune BRDF for RenderMan. http://www.graphics.cornell.edu/westin/lafortune/lefortune.html.

Cited By

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  • (2022)Recursive analytic spherical harmonics gradient for spherical lightsComputer Graphics Forum10.1111/cgf.1448241:2(393-406)Online publication date: 24-May-2022
  • (2020)Robust fitting of parallax-aware mixtures for path guidingACM Transactions on Graphics10.1145/3386569.339242139:4(147:1-147:15)Online publication date: 12-Aug-2020
  • (2018)Second-Order Occlusion-Aware Volumetric Radiance CachingACM Transactions on Graphics10.1145/318522537:2(1-14)Online publication date: 2-Jul-2018
  • Show More Cited By

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  1. Improved radiance gradient computation

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    cover image ACM Conferences
    SCCG '05: Proceedings of the 21st Spring Conference on Computer Graphics
    May 2005
    227 pages
    ISBN:1595932046
    DOI:10.1145/1090122
    • Conference Chair:
    • Bert Jüttler
    Permission to make digital or hard copies of all or part of this work for personal or classroom use is granted without fee provided that copies are not made or distributed for profit or commercial advantage and that copies bear this notice and the full citation on the first page. Copyrights for components of this work owned by others than ACM must be honored. Abstracting with credit is permitted. To copy otherwise, or republish, to post on servers or to redistribute to lists, requires prior specific permission and/or a fee. Request permissions from [email protected]

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    New York, NY, United States

    Publication History

    Published: 12 May 2005

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    Author Tags

    1. global illumination
    2. irradiance gradients
    3. radiance caching
    4. radiance gradients
    5. ray tracing

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    SCCG05
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    SCCG05: Spring Conference in Computer Graphics
    May 12 - 14, 2005
    Budmerice, Slovakia

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    Overall Acceptance Rate 67 of 115 submissions, 58%

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    Cited By

    View all
    • (2022)Recursive analytic spherical harmonics gradient for spherical lightsComputer Graphics Forum10.1111/cgf.1448241:2(393-406)Online publication date: 24-May-2022
    • (2020)Robust fitting of parallax-aware mixtures for path guidingACM Transactions on Graphics10.1145/3386569.339242139:4(147:1-147:15)Online publication date: 12-Aug-2020
    • (2018)Second-Order Occlusion-Aware Volumetric Radiance CachingACM Transactions on Graphics10.1145/318522537:2(1-14)Online publication date: 2-Jul-2018
    • (2017)Real-time global illumination by precomputed local reconstruction from sparse radiance probesACM Transactions on Graphics10.1145/3130800.313085236:6(1-13)Online publication date: 20-Nov-2017
    • (2015)Recent Advances in Adaptive Sampling and Reconstruction for Monte Carlo RenderingComputer Graphics Forum10.5555/2816723.281678134:2(667-681)Online publication date: 1-May-2015
    • (2015)Recent Advances in Adaptive Sampling and Reconstruction for Monte Carlo RenderingComputer Graphics Forum10.1111/cgf.1259234:2(667-681)Online publication date: 22-Jun-2015
    • (2012)Practical Hessian-based error control for irradiance cachingACM Transactions on Graphics10.1145/2366145.236621231:6(1-10)Online publication date: 1-Nov-2012
    • (2012)Theory, analysis and applications of 2D global illuminationACM Transactions on Graphics10.1145/2231816.223182331:5(1-21)Online publication date: 7-Sep-2012
    • (2011)Adaptive Records for Irradiance CachingComputer Graphics Forum10.1111/j.1467-8659.2010.01846.x30:6(1603-1616)Online publication date: 17-Jan-2011
    • (2009)Photon‐driven Irradiance CacheComputer Graphics Forum10.1111/j.1467-8659.2008.01346.x27:7(1971-1978)Online publication date: 23-Jan-2009
    • Show More Cited By

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