Volume-based indirect illumination with irradiance decomposition

Ruirui Li; Kaihuai Qin

doi:10.1117/12.2064399

16 April 2014 Volume-based indirect illumination with irradiance decomposition

Ruirui Li, Kaihuai Qin

Proceedings Volume 9159, Sixth International Conference on Digital Image Processing (ICDIP 2014); 91591C (2014) https://doi.org/10.1117/12.2064399
Event: Sixth International Conference on Digital Image Processing, 2014, Athens, Greece

Abstract

This paper proposes a fast and accurate algorithm for indirect illumination. It uses volumes of different resolutions to sample and cache the geometric information and the secondary lights. By dividing the irradiance into two parts, it treats the lights coming from the far-field and that coming from the near-field differently. For the far-field ones, it propagates sphere harmonic represented lights on coarse voxels. For the near-field ones, it shoots rays and collects their contributions on fine voxels. By doing this, the algorithm in this paper avoids using many rays to march long distance. In the experiments, it renders about ten times faster than the VGI algorithm to get the same image qualities, especially for the large and complex scenes. Meanwhile, it further accelerates the rendering by inventing an incremental multi-resolution gathering. The experiments illustrate fast and accurate indirect light effects.

Citation Download Citation

Ruirui Li and Kaihuai Qin "Volume-based indirect illumination with irradiance decomposition", Proc. SPIE 9159, Sixth International Conference on Digital Image Processing (ICDIP 2014), 91591C (16 April 2014); https://doi.org/10.1117/12.2064399

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