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Improved Half Vector Space Light Transport
Author(s) -
Hanika Johannes,
Kaplanyan Anton,
Dachsbacher Carsten
Publication year - 2015
Publication title -
computer graphics forum
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.578
H-Index - 120
eISSN - 1467-8659
pISSN - 0167-7055
DOI - 10.1111/cgf.12679
Subject(s) - computation , computer science , markov chain , perturbation (astronomy) , euclidean vector , ordered vector space , vector space , algorithm , topology (electrical circuits) , mathematics , geometry , physics , combinatorics , biochemistry , chemistry , quantum mechanics , functional analysis , machine learning , interpolation space , gene
In this paper, we present improvements to half vector space light transport (HSLT) [KHD14], which make this approach more practical, robust for difficult input geometry, and faster. Our first contribution is the computation of half vector space ray differentials in a different domain than the original work. This enables a more uniform stratification over the image plane during Markov chain exploration. Furthermore, we introduce a new multi chain perturbation in half vector space, which, if combined appropriately with half vector perturbation, makes the mutation strategy both more robust to geometric configurations with fine displacements and faster due to reduced number of ray casts. We provide and analyze the results of improved HSLT and discuss possible applications of our new half vector ray differentials.