4.5 Article Proceedings Paper

Merged Multiresolution Hierarchies for Shadow Map Compression

Journal

COMPUTER GRAPHICS FORUM
Volume 35, Issue 7, Pages 383-390

Publisher

WILEY
DOI: 10.1111/cgf.13035

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Multiresolution Hierarchies (MH) and Directed Acyclic Graphs (DAG) are two recent approaches for the compression of high-resolution shadow information. In this paper, we introduce Merged Multiresolution Hierarchies (MMH), a novel data structure that unifies both concepts. An MMH leverages both hierarchical homogeneity exploited in MHs, as well as topological similarities exploited in DAG representations. We propose an efficient hash-based technique to quickly identify and remove redundant subtree instances in a modified relative MH representation. Our solution remains lossless and significantly improves the compression rate compared to both preceding shadow map compression algorithms, while retaining the full run-time performance of traditional MH representations.

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