a_survey_of_shading_models

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1、ASurveyofShadingModelsforReal-timeRenderingorHowtostealcomponentsfromvariousBRDFsandcombinethemintoyourownKarstenSchwenkMarch14,2008AbstractThisarticlepresentsasurveyofpopularshadingmodelsusedin3Dcomputergraphics.Eachmodelisdiscussedonthebasisofanhardware-accel

2、eratedimplementationthatrunsontypicalconsumer-gradegraphicsboards.Thediscussionisfocusedoninteractivereal-timeapplications,where{besidesrealism{computationalcosts,scal-ability,andeasilytweakableparametersareimportantfactors.Furthermore,anattemptismadetoincorpor

3、atethestrengthsofsomeofthediscussedshadingmodelsintoanewone.Specialatten-tionhasbeenpaidtotheaforementionedfactorstomakethemodelparticularlysuitableforreal-timeapplicationssuchasvideogames.1Contents1Introduction32Shadingfundamentals32.1Radiometry...............

4、.............42.2Thebidirectionalre ectancedistributionfunction.......62.3Fresnelre ectance........................83Popularshadingmodels113.1Thetestframework........................113.2Lambert..............................133.3Phong...........................

5、....143.4Oren-Nayar............................163.5Cook-Torrance..........................203.6Ashikhmin-Shirley........................223.7Ward................................243.8Lafortune.............................263.9Strauss............................

6、...273.10Schlick...............................293.11Otherinterestingmodels.....................304Yetanothershadingmodel314.1Requirements...........................324.2Themodel.............................334.3Discussionofresults.......................395Conc

7、lusion4021IntroductionTheeldofcomputergraphicshasbrednumerousshadingmodelsoverthepastyears.Thisarticlepresentsasurveyofthemostpopular1ofthesemodels.Themainobjectiveofthisarticleistoassessthecostsandbenetsoftheseshadingmodelswithregardtotheirapplicationinhardw

8、are-acceleratedreal-timecomputergraphics.HLSL-implementationsofthemodelscanbefoundintheaccompanyingFXle.AprojectleforNVIDIA'sFXComposer2.0isincluded,too.Schlick[20]conduct