基于MultiGen的虚拟现实三维建模技术研究与实现77

重庆大学硕士学位论文基于MultiGen的虚拟现实三维建模技术研究与实现姓名：翟丽平申请学位级别：硕士专业：控制理论与控制工程指导教师：柴毅20050501IVRMultiGenCreatorMultiGenCreatorMultiGenCreatorMultiGenCreatorMultiGenCreatorVegaVegaMultiGenCreatorMultiGenvegaIIABSTRACTInrecentyears,VirtualReality(VR)technologyhasbeenpaidextensiveattentionincomputerfield.Virtualrealitytechnologyisdesigningalifelikevirtualenvironmentbasedonthecomputertechnology,whichcanaccessinteractionbetweentheuserandtheenvironmentbyuseoftheessentialdevice.Itisanessentialconditiontodesignalifelikemodelforuserfeelingthelifelikevirtualenvironment.3DmodelingtechnologyisthefoundationoftheVRsystemandthekeystepandtechnologyoftheapplication.itisanimportantpartinvirtualrealitysystemwhendevelopingavirtualrealitysystem.TheauthordevelopedthevirtualrealitysystemofthedigitallaunchsiteinMultiGenCreatorandVegaenvironment,whichrealizedthedigitalizationoflaunchsite,real-timesimulationofSatelliteLaunchandassistantofSatellitelaunchmission.Thepapercarriedoutstudyataspectofthecomplicatedmodeling,thevisualscencedesigning,thereal-timeoptimizingandthesystemestablishingtorealingsomeimportantconceptionsandmethodsofVRmodeling.OnthebasisofthetheorystudyofVRmodelingandcharacteristicofsystemthepaperchoosegeometry-basedmodelingandrenderingschemetocreatethedigitalspacelaunchsitewiththeoutstanding3DmodelingandpresentedsoftwareofMultiGenandVegainthefieldofvisualscenesimulation.Thepaperputsupthemodelingprocessandimplementschemeofthecomplicated3Dscencesystemintegrationandattempermanage.Forsolvingthecontradictionbetweenreal-timeandreality,thepaperresearchedthekeymodelingtechnologyandthenthepaperproposedtheeffectiveapproachesforreal-timeimprovementbasedonMultiGenfromtheaspectofstructureoptimizingandmodelingoptimizing.ThelastpartfirstlydiscussedtheVegasoftwareandtherendingelements,andthenpresentedtheactualizingschemeofthedigitalspacelaunchsitesystemwiththehighscenecomplexity,real-timeandinteraction.Thesystemcandisplayscence,walkthrough,drivethemotionmodelanddisplaythespecialeffect,andsoon.ThespecializationofthedigitalspacelaunchsiteandvisualflightsimulationsystemmakesthethesispossesstherepresentativenessofVirtualRealitymodeling.JustsotheproposedtheoryandmethodsinthepaperhasacertainextentreferenceworthIIIfor3Dmodelingtechnology,real-timevisualscenesimulationandvirtualrealitysystem.KeywordsVirtualReality,3DModeling,MultiGenCreator,MultiGenvega1111.11.1.1863GISMultiGen-ParadigmMultiGenCreatorVega1.1.2VirtualRealityVR[1][2][3]VRVRVRVRCAVEVR2VRVRMultiGenParadigmMultiGenCreator/VegaVR1.21965VRIvanSutherlandIFIP[1]TheUltimateDisplay1966MIT1970HMD60JaronLanier80VirtualReality[2]80NASA13902090DVISIONSuperVisiosDVSSense8WorldToolKitWorldUpSGIOpenInventorOpenGLPerformerAutodeskLightscapeMultiGenMultiGenCreatorVegaEONEONVRMLVirtualRealityModelingLanguageOpenGLHTML1.2.1[4][5][6][7]VRNASAVRMultiGen-Paradigm/MultiGenCreator/VegaMultiGen-ParadigmOpenFlightSGIOpenGLCG2INCVtreeMaKTechnologiesVR-LinkMAKVR-LinkDODDISHLABristolDVS4DVSDimensionInternationalPC4863VirtualPrototypesVPISTAGEInfotronINC.VSIVegaStageInterfaceVegaStage1.2.2[1-7]VRVRVRCAD&CG15CAD863CAD/CAMVR1.31.3.1MultiGenCreator/VegaVRVRMultiGenCreator/VegaMultiGenMultiGenCreator/VegaMultiGen6MultiGenVega1.3.2MultiGen12MultiGenOpenFlightwallloft3MultiGenMultiGenCreator4MultiGen5VegaVega62722.12.1.1VirtualRealityJaronLanier80[1]3I[2]ImmersionInteractionImagination2.1.2[2]2.1Fig.2.1VirtualRealitySystemComponent3D8VRVRCAVEVRVR2.1.3[2][1]2.2VRVR292.2Fig.2.2VirtualRealitySystemResearchContents///102.22.2.1VRVRVRCADVRDOFDegreeofFreedomLOD2.12.1Table2.1ComparisonbetweenVirtualRealityand3DAutomation2112.2.2.VR[8]12VR122.2.3VRVR[9][10]MBR(IBR)[9]Geometry-BasedModelingandRenderingGBMR(Graphic-BasedModelingandRenderingGBMR)()2.32.3Fig.2.3FlowChartofModelingMethod213123123(Image-BasedModelingandRenderingIBMR)2.4Fig.2.4FlowChartofImagingMethod14[11][12]1234RealWorldImages123IBMRGBMR[13][13]GBMRIBMR2.2.4VR2151LevelOfDetaiLODLODLODMophingLOD2Image-basedRendering345123z-bufferBSP3DOFDOF162.3MultiGenCreatorMultiGenCreatorOpenFlight.flt2.3.1MultiGenCreator[14][15][16]MultiGenCreatorMultiGenparadigmMultiGenCreatorMultiGenCreator25OpenFlightVRMultiGenCreator2.3.2MultiGenCreatorOpenFlight[17]()CADOpenFlightMultiGenParadigmSceneDescriptionDatabaseSpecificationGroupLODSwitchDOF217LightsourceGroup2.5OpenFlightFig.2.5NodeofOpenFlightDatabaseOpenFlightMultiGenOpenFlight64kb340IDOpenFlightOpenFlight1HeaderLevelOpenFlight2(GroupLevel)dbGroupLODSwitchDOFLightsourceObjectFaceSubFace183(ObjectLevel)//4(FaceLevel)5VertexLevelMultiGenCreatorUSGSDEM()USGSDLGNIMADFED.dxf.obj.3ds(rgba)2.12.1Table2.1ModelandDataFormatofSoftwareDXFAliasOpenFlightRwRwRw.int/inta.rgb/rgba.tiff.gif.iff/.ilm.pcx.jpeg.wavefront/.rla.Alias/.pixRwRwRoRoRoRoRoRoRo219HierarchyView(MultiGen)()MultiGen2.6MultiGen2.6Fig.2.6HierarchyView(HierarchyView)(HierarchyTools)1()2()34202.3.3Creator[18]CreatorCreator{}kppp...,,21()()(){}k2211,,...,,,,yxyxyxkmpnp2.7Fig.2.7TheExampleChartoftheRandomCurvilinearFacenmppnmnmmmxxyyxxyy−−−−(2.1)0=++CByAx(2.2)DyyAnm−=DxxBnm−=DyxyxCmnnm−=()(