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Measuring Spatially- and Directionally-varying Light Scattering from Biological Material
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VisibilityCluster: average directional visibility for many-light rendering.

Yu-Ting Wu1, Yung-Yu Chuang

  • 1Department of Computer Science and Information Engineering, National Taiwan University, R503, CSIE Building, No. 1, Sec. 4, Roosevelt Rd., Taipei 106, Taiwan, ROC. kevincosner@cmlab.csie.ntu.edu.tw

IEEE Transactions on Visualization and Computer Graphics
|July 13, 2013
PubMed
Summary
This summary is machine-generated.

The VisibilityCluster algorithm efficiently approximates visibility in many-light rendering by clustering lights and shading points. This method reduces rendering variance and enhances realism, outperforming existing techniques.

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Area of Science:

  • Computer Graphics
  • Computational Geometry

Background:

  • Many-light rendering presents challenges in efficiently approximating visibility.
  • Visibility coherence between nearby lights and shading points is often observed.

Purpose of the Study:

  • To propose an efficient algorithm for visibility approximation and representation in many-light rendering.
  • To reduce variance in Monte Carlo rendering and enhance realism through directional occlusion effects.

Main Methods:

  • The VisibilityCluster algorithm clusters lights and shading points to form a visibility matrix.
  • It exploits the matrix's sparse structure for efficient average visibility estimation using few shadow rays.
  • Visibility variance is used as a quality measure for local refinement of clusters.

Main Results:

  • The algorithm successfully incorporates visibility into importance sampling for the many-light problem.
  • Significant reduction in variance for Monte Carlo rendering was achieved.
  • Directional occlusion effects were added to increase local shading realism.

Conclusions:

  • VisibilityCluster offers an efficient and effective solution for many-light rendering visibility problems.
  • The method outperforms current state-of-the-art importance sampling algorithms.
  • It enhances preview quality for lighting design applications.