https://www.cs.cornell.edu/~srm/publications/EGSR07-btdf.pdf
http://jbit.net/~sparky/academic/mm_brdf.pdf
https://digibug.ugr.es/bitstream/handle/10481/19751/rmontes_LSI-2012-001TR.pdf;jsessionid=FD46E42CC1065E1834DC9F9F112869A2?sequence=1
https://hal.archives-ouvertes.fr/tel-01291974/file/TH2015DupuyJonathan2.pdf