Hash-based hierarchical caching and layered filtering for interactive previews in global illumination rendering

Thorsten Roth, Martin Weier, Pablo Bauszat, André Hinkenjann, Yongmin Li

Research output: Contribution to journalArticleScientificpeer-review

Abstract

Modern Monte-Carlo-based rendering systems still suffer from the computational complexity involved in the generation of noise-free images, making it challenging to synthesize interactive previews. We present a framework suited for rendering such previews of static scenes using a caching technique that builds upon a linkless octree. Our approach allows for memory-efficient storage and constant-time lookup to cache diffuse illumination at multiple hitpoints along the traced paths. Non-diffuse surfaces are dealt with in a hybrid way in order to reconstruct view-dependent illumination while maintaining interactive frame rates. By evaluating the visual fidelity against ground truth sequences and by benchmarking, we show that our approach compares well to low-noise path-traced results, but with a greatly reduced computational complexity, allowing for interactive frame rates. This way, our caching technique provides a useful tool for global illumination previews and multi-view rendering.

Original languageEnglish
Article number17
Number of pages25
JournalComputers
Volume9
Issue number1
DOIs
Publication statusPublished - 1 Mar 2020

Keywords

  • Caching
  • Global illumination
  • Level-of-detail
  • Ray tracing
  • Rendering

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