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Updated: Jul 8, 2026

Scattering And Absorption of Light in Planetary Regoliths

Scattering And Absorption of Light in Planetary Regoliths

Published on: July 1, 2019

Spherical piecewise constant basis functions for all-frequency precomputed radiance transfer.

Kun Xu¹, Yun-Tao Jia, Hongbo Fu

¹Department of Computer Science and Technology, Tsinghua University, Beijing, People's Republic of China. xu-k@mails.tsinghua.ed.cn

IEEE Transactions on Visualization and Computer Graphics

|January 15, 2008

Summary

This study introduces spherical piecewise constant basis functions (SPCBFs) for efficient precomputed radiance transfer. These functions enable real-time rendering of dynamic scenes with object rotation and on-the-fly material editing.

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Area of Science:

Computer Graphics
Rendering Techniques

Background:

Precomputed radiance transfer (PRT) is crucial for realistic rendering.
Efficiently handling dynamic scenes and material properties in PRT remains a challenge.

Purpose of the Study:

To introduce a novel basis function for PRT.
To enable efficient all-frequency rendering with dynamic elements.

Main Methods:

Developed spherical piecewise constant basis functions (SPCBFs).
Partitioned the illumination sphere and precomputed light coefficients.
Utilized summed-area tables (SAT) and visibility distance tables (VDT) for runtime approximation.

Main Results:

SPCBFs support efficient rotation and all-frequency signal representation.
Achieved real-time frame rates with graphics hardware acceleration.
Enabled dynamic scene rendering with object rotation and BRDF editing.

Conclusions:

SPCBFs offer a robust solution for advanced PRT.
The method facilitates novel real-time rendering effects.