逆向模型重建技术的研究

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1、首都师范大学硕士学位论文逆向模型重建技术的研究姓名：孙永锋申请学位级别：硕士专业：计算机应用技术指导教师：刘旭敏20080516首都师范大学硕士学位论文逆向模型重建技术的研究AbstractReverseengineeringisflFlEWsubjectandtechnologycoiningupwiththedevelopmentofcomputerscienceanddatadigitization．It：ShelptochangethedesignmodefromdrafttomodelsinconventionalC

2、ADsystems．It’Sanewapproachforrapidprototypemanufacture．Curveandsurfacereconstructionaretwobasilicaquestionsinreverseengineering．Withthedataacquiredfromoreexistentobject，thegeometricalmodelscanbereconstructedwhichisausefultoolstostudytheexistentobjectsuchfitsanalysis

3、，computingandrendering．TriangulationofscattereddataisthefirstimportantstepandthebaseoflaterstepofreconstructingcurvedSurfaceinReverseEngineering．Meanwhile,withtherecentdevelopmentof3Ddatacollectiontechnologiesandhardwarefacilities，peoplec组getthedatainformationofthep

4、hysicalmodelbyusingtheadvancedmeasurementtools．Thedataoftenisscattered,andthevolumeofthedataisverylarge．ItisverydifficulttodirectlyreconstructNURBSsurfaogfromsuchdata,SOpeopledivertattentiontothePolynomialmeshes．Meshescandeseriptcomplexshapeobjects，especiallytriangu

5、larmeshiswiththeadvantagesofsimplecalculation,greatnumericalstabmtyandhi曲showingefficiency,butwiththevoluihaeofthedatasignificantlyincreasing,thegeometrydetailsgotbyscanningandtheshapeisbecomingrichgraduany,theneedton哪methodwhichc,aneffectivelypI：oI面Iccandprocessult

6、ra-large-scalegeometricmodelisgrowingdaybyday．Itisverydifficultformeetingtherequirementsofauthenticityreal-timeperformanceandinteractiveperformanceonlytousethetraditionalrenderingmethodbased011triangularmeskitisanothernewfieldtoploducetriangularmeshandtosimplifythet

7、riangularmesh．．Thispaperintroducesthebackgroundofarticletopic．,significanceandthemaintechnologyinrevol'∞engineering．1．ConsideringtheBrzierc铷a'veasanexample,itistoresearchOnthere-parametricandoptimalparameterizationandusetheoptimalparameterizationmethodintotheeUl'VOr

8、e∞mtruction．2．Judgingthepolygon弱concaveorconvex，atriangulationmethodofpolygonisproposed．3．ConsideringEdgecollapseandimprovedQuadric—errorm