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1、CEIG-SpanishComputerGraphicsConference(2016)AlejandroGarcía-AlonsoandBelenMasia(Editors)BidirectionalRenderingofPolarizedLightTransportAdrianJaraboandDiegoGutierrezUniversidaddeZaragozaI3AInstituteAbstractOnthefoundationsofmanyrenderingalgorithmisthesymmetrybetweenthe
2、pathtraversedbylightanditsadjointfromthecamera.However,severaleffects,includingpolarizationorfluorescence,breakthatsymmetryandaredefinedonlyonthedirectionoflight.Thiscomplicatestheapplicabilityofbidirectionalmethods,thatexploitthesymmetryforeffectiverenderinglighttransp
3、ort.Inthisworkwefocusonhowtoincludepolarizationwithinabidirectionalrenderingalgorithm.Forthat,wegeneralizethepathintegraltosupporttheconstraintsimposedbynon-symmetriclighttransport.Basedonthistheoreticalframework,weproposemodificationsontwobidirectionalmethods,namelybi
4、directionalpathtracingandphotonmapping,extendingthemtosupportpolarization.CategoriesandSubjectDescriptors(accordingtoACMCCS):I.3.7[ComputerGraphics]:Three-DimensionalGraphicsandRealism—Raytracing1.Introductiontemporaldomain.Therefore,whilefortraditionallighttransportt
5、heymightbeimportant,theybecomecrucialwhencomputingFormanyyearslighttransportsimulationhasexploitedthesym-lighttransportintransient-state[JMM14].Includingtheseeffectsmetryofmostcommonscatteringoperatorsforbuildingefficientishowevernon-trivialin(steady-andtransient-stat
6、e)bidirectionalmethodsforrendering.Thissymmetryinvolvesthat,independentlymethods,duetotheneedoftrackingthestateofthesubpath,andonwhetherthescatteringiscomputedfromthepropagationdi-becausetheoperationordermatters.rectionofthelight,orfromitsadjoint(i.e.thedirectionfromt
7、hecamera),thethroughputofthelighttransportwouldbeexactlytheInthiswork,wefocusondevelopinganon-symmetric,butsame[Vea97].bidirectionalrenderingsystem,inparticularfocusedonpolariza-tion.Wefirstformalizenon-symmetricpolarizedlighttransportStartingfromraytracing(asopposedto
8、lighttracing),thesebygeneralizingthewell-knownpathintegralformulation[Vea97]methodshavetakenadvantageofthissymmetrytocompute
