基于Catmull-Clark模式自適應(yīng)細(xì)分技術(shù)研究.pdf

1、大連理工大學(xué)碩士學(xué)位論文基于CatmullClark模式自適應(yīng)細(xì)分技術(shù)研究姓名：戴晨光申請(qǐng)學(xué)位級(jí)別：碩士專業(yè)：機(jī)械制造及其自動(dòng)化指導(dǎo)教師：王敏杰20071201基于cat哪!1clarl【模式白適應(yīng)細(xì)分技術(shù)研究ResearchonTechnologyofAdaptiveSubdivisionSurfaceBasedonCatmullClarkScheme／IbstractSubdivisionschemeisan刪discretemod

2、elingtechnologywhichdescribesthemodelingsurfacethroughcontrollingmeshandsubdivisionrulesIthasmanyadvantagessuch笛localnessand緬neinvarianceoftraditionalB—spline5urfaccadaptabilitytoarbitrarytopologywhichparametersurfacesno

3、thave，andbecomingoneofthemostpowerfulgeometricmodelingtoolsSubdivisionschemeforsurfaceisgradllalsubdivisionwhichobtain5fmalsurfacebydiscretetodiscretemethodandthedisadvantageofconventionalmethodfromdiscretetocontinuousan

4、dthenfromcontinuoustodiscreteisavoidedDuetoitssimplenessandconveniencetoimplement。thesubdivision踮hemehasbecomeafocustopicOllcomputeraidedgeome伍cdesignandcomputergraphicsrecentlyTherearemanysubdivisionschemessuchasCalmull

5、ClarksubdivisionDooSabinsubdivisionloopsubdivisionandetcTbeCatmullClarksubdivisionschemeisgeneralizedofB—splinesulfal七sitcanbeblentwithⅫ瓜BSsurfaceseasilyandbeunifiedwiththeNCprocessingcommendablyThepaperfocusesontheCatmu

6、llClarksubdivisionsurfacesmodelingtechniquesandtheadaptivesubdivisionmethodisadaptedtoimprovemodelingabilitiesofsubdivisionsurfacefromdifferentviewpointsandconsⅡuctsmorerelationsbetweensubdivisionsurf∞esand啊瓜BSsurfacesTh

7、emaincontentsa托asfoUOWS：1TheCalmullClarksubdivisionschemeisemphasizedincludingitsbasictheoriesdevelopmentresearchandrulesofsubdivision11他relatedresearchaboutadaptivesubdivisionissummarizedandanalyzedfromthesubdivisioncri

8、terionhandlmgstrategyofcracksandcalculatingofmeshvertexes2AnewadaptiveSubdivisionmethodbasedonCaUnull—Clarkforquadrilateralmeshisapplying111edihedralanglevalueissetasthethresholdtoevaluatetheflatnessofthemeshandthroughth

9、evaluetocommandthepartialsubdivisiondepthsnlismethodcanlimitthenumberofthemeshesandamethodisalsopresentedtoavoidgeneratingcracksbydifferentsubdivisiondepthsThroughsimulationitprovesthatthismethodcanreducedataquantityandi

10、ncreasecomputingS1)∞d3Adaptivesubdivisionmethodhasaninfluenceonthecontinuityofsurfacemeshes，amodifiedadaptivesubdivisionschcmewhichbasedonCatmullClark∞hemeisdiscussedforquadrilateralmesllThemethodu∞stheinscribedpolygonre