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1、ComparingSimplificationandImage-BasedTechniquesfor3DClient-ServerRenderingSystemsW.Pasman,F.W.JansenDelftUniversityofTechnologyABSTRACTAmathematicalmodelispresentedforcomparinggeometricandimage-basedsimplificationmethods.Geometricsimplificationreducesthenumbe
2、rofpolygonsinthevirtualobjectandimage-basedsimplificationreplacestheobjectwithanimage.Ourmodelintegratesandextrapolatesexistingaccuracyestimates,enablingthecomparisonofdifferentsimplificationmethodsinordertochoosethemostefficientmethodinagivensituation.Themod
3、elcomparesdatatransferandrenderingloadofthemethods.Bytesizeandexpectedlifetimeofsimplificationsarecalculatedasafunctionofthedesiredvisualqualityandthepositionandmovementoftheviewer.Anexampleresultisthatintypicalviewingandrenderingconditionsandforobjectswithar
4、adiusintheorderofonemeter,impostertechniquescanbeusedatviewingdistancesabovefifteenmeters.Belowthat,simplifiedpolygonobjectsarerequired,andbelowonemeterdistancethefull-resolutionvirtualobjecthastoberendered.Anelectronicversionofthemodelisavailableontheweb.IND
5、EXTERMS:realtimerendering,dynamicgeometrysimplification,imposters,resourceload,thinclient,mathematicalmodel1INTRODUCTIONVariousgeometricandimage-basedsimplificationtechniques,suchassimpleimposters[Schaufler96,Maciel95],meshedimposters[Sillion97,Decoret99]ands
6、implifiedpolygonmodels[Schroeder92]havebeendevelopedtoadaptthecomplexityofascenetotheavailablebandwidthandcapacityoftherenderingengineandnetwork.Thesesimplificationandimpostertechniquesoftenpreserve,foragivenviewpoint,crucialaspectsoftheobjectssuchascontouran
7、dfrontimage,whilesacrificinggeometricaccuracyforotherviewpoints.Thisintroducesthenotionoflifetimeforthesimplifiedrepresentation:astheviewpointchanges,thevisualdistortionwillgrowandwillrunthesimplificationobsolete.Therepresentationthenwillhavetoberefreshedorre
8、placedwithanotherformofgeometricsimplification.Weassumethattherenderingandsimplificationareseparatedandcanbecharacterisedasaserver-clientarchitecture,wheretheserverholdsthecompletescenemo
