Efficient Sampling of Re-radiation Matrices in Fluorescence-capable Rendering Systems
Efektivní vzorkování matic reradiace v rendererech s podporou fluorescence
diploma thesis (DEFENDED)
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http://hdl.handle.net/20.500.11956/148663Identifiers
Study Information System: 224049
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- Kvalifikační práce [11233]
Author
Advisor
Referee
Iser, Tomáš
Faculty / Institute
Faculty of Mathematics and Physics
Discipline
Computer Graphics and Game Development
Department
Department of Software and Computer Science Education
Date of defense
13. 9. 2021
Publisher
Univerzita Karlova, Matematicko-fyzikální fakultaLanguage
English
Grade
Excellent
Keywords (Czech)
počítačová grafika|renderování|simulace transportu světla|fluorescenceKeywords (English)
computer graphics|rendering|light transport simulation|fluorescenceFluorescence is a common effect in nature, it re-emits light by absorbing photons, caus- ing a wavelength shift from a shorter wavelength to a longer one. In recent years, there is an increased interest in including fluorescence in physically-based rendering. Fluorescence behavior is properly represented as a re-radiation matrix: for a given input wavelength, this matrix indicates how much energy is re-emitted at all other wavelengths. However, such a 2D representation has a significant memory footprint, especially when a scene con- tains a high number of fluorescent objects or fluorescent textures. This thesis proposes using Gaussian Mixture Domain to model re-radiation, which allows us to significantly reduce the memory footprint. Instead of storing the full matrix, we work with a set of Gaussian parameters that also allow direct importance sampling. When accuracy is a concern, one can still use the re-radiation matrix data and just benefit from impor- tance sampling provided by the Gaussian Mixture. Our method is useful when numerous fluorescent materials are present in a scene, particularly for textures with fluorescent components. 1