1、南京航空航天大學碩士學位論文基于手繪草圖三維建模方法研究姓名：韓紅波申請學位級別：碩士專業(yè)：機械設計及理論指導教師：王靜秋20081201一種基于手繪草圖的三維建模方法研究IIABSTRACTConceptualdesignistheearlierstageoftheproductdesignprocess.Itplaysadecisiveroleinthewholeprocessofproductdesign.Inthispapert

2、hemainpurposeoftheresearchistodesignacomputeraidedconceptualdesignsystemwhichcanbeusedtohelpdesignersexpresstheircreativityintentionbettermeefficiently.Sothatthissystemcangivethedesignersgreaterhelpinproductdesignespecia

3、llyintheconceptdesignstage.Inthispaperthethreedimensionalmodelingtechnologybasedonsketchisthefoundationoftheconceptualdesignsystem.Theinterfaceofthissystemisthepenstyleinterfacewhichhasbeenresearchedinthepastfewyears.The

4、userinterfaceisdividedintoseveraldifferentareassuchasthegestureareathecontourareathecontrolinfmationareasoon.Atfirstthesketchinputtedinthegestureareashouldbeidentifiedbythissystemtocomprehendconfirmtheintentionoftheuser.

5、thenthethreedimensionalmodelcanbeconstructedaccdingtotheinfmationinputtedinthecontourareacontrolinfmationarea.ToidentifythegesturesuchasExtrudeRotateasimplifiedtemplatematchingalgithmisadoptedinthisresearch.Torecognizeso

6、mebasicgraphicelementssuchastherectanglecirclearecognitionalgithmbasedontolerancecircuitispresented.Withthisalgithmthesystemcanrecognizethesketchinputtedbytheuser，understthesemanticscreatetheinfmationofthethreedimensiona

7、lmodel.Tocreatethethreedimensionalmodeltwomethodsareadoptedinthispaper.Thefirstoneismodelingbasedongesturefeature.Anotheroneismodelingoffreefmsurfacebasedon2Dcontour.Atlastthe3Ddefminggridtechnologyisstudiedinthispaperth