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1、EurographicsSymposiumonRendering(2007)JanKautzandSumantaPattanaik(Editors)MicrofacetModelsforRefractionthroughRoughSurfacesBruceWalter1?StephenR.Marschner1HongsongLi1,2KennethE.Torrance11ProgramofComputerGraphics,CornellUniversity2BeijingInstituteofTechnologyAbstractMicrofacetm
2、odelshaveprovenverysuccessfulformodelinglightre?ectionfromroughsurfaces.Inthispaperwereviewmicrofacettheoryanddemonstratehowitcanbeextendedtosimulatetransmissionthroughroughsurfacessuchasetchedglass.Wecomparetheresultingtransmissionmodeltomeasureddatafromseveralrealsurfacesandd
3、iscussappropriatechoicesforthemicrofacetdistributionandshadowing-maskingfunctions.Sincerenderingtransmissionthroughmediarequirestrackinglightthatcrossesatleasttwointerfaces,goodimportancesamplingisapracticalnecessity.Therefore,wealsodescribeef?cientschemesforsamplingthemicrofac
4、etmodelsandthecorrespondingprobabilitydensityfunctions.CategoriesandSubjectDescriptors(accordingtoACMCCS):I.3.7[Three-DimensionalGraphicsandRealism]:Keywords:Refraction,MicrofacetBTDF,Cook-TorranceModel,GlobalIllumination,MonteCarloSampling1.Introductiontooff-specularpeaksinrou
5、ghre?ection),andthemicrofacetmodelsareabletosuccessfullypredictsucheffects.WealsoTransmissionintoorthroughrefractivemediaisanimpor-introduceanewmicrofacetdistribution,whichwecallGGX,tantcomponentintheappearanceofmanymaterials,includ-thatprovidesaclosermatchforsomeofoursurfacest
6、hantheingbothlargelytransparentmedia,suchasglassorwater,standardBeckmanndistributionfunction.andtranslucentmedia,suchasskinormarble.Whentheboundaryofamediumissmooth,thentransmissioniseasilyNextwewilldiscussrelatedwork,andthenreviewgen-modeledusingSnell’slawofrefraction.However,
7、whentheboundaryisrough,thereisalackofphysicallybasedandveri?edmodelsforuseincomputergraphics.Inthispaperwe?rstreviewmicrofacettheoryandshowhow,usingageneralizationofthehalfvector,itcanbeusedtomodelbothre?ectionandrefractionatroughboundariesbetweenmedia.Thisprovidesacompleteanal
8、yticBSDFmodelthatcanbeusedtosimulateroughtransmissivem
