基于点云的自由形态网格生成方法分析

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1、万方数据浙江大学硕士学位论文AbstractFree—formspatialgridstructureisthegddstructurethathasnoanalyticexpressionanditsformsCanchangeinanyway．negridgenerationofthiskindofstructureisdi伍cultbecauseofthecharactericsofitsvariousandfreeforms．Thispaperproposedanewmethodtogenerategridsfrompointcloud

2、whichdevelopedtheexistingmethodsofgridgenerationandgridoptimization．Basedontheexistingresearch，thispapersummarizedtheapplicationsofreversemodelingonflee·form鲥dstructures．Anoverviewofthemethodofgridgenerationofpointcloud，featuredetectionofpointcloudandgridoptimizationisgiven．

3、．Thequadrilateralgrid·generationisdevelopedbasedon3Dpointcloud．111ePavingMethodwidelyusedinFEMisapplied．AneffectivewaytosearchfortheKnearestneighboringpointsofthecloudpointisstatedandthewaytodetectpointcloudboundaryandcalculatenormalsofpointsisintroduced．Thestrategyofcreatin

4、gnewnodeswhenadvancingfrontsandclosuredetectionisperfectedandfinallydeveloptheprogramwhichCallbeappliedtogenerate酊dsfrompointcloud，Thedetectionandextractionofpointcloudistheimportantfunmentalof鲥dgeneration．Thispaperemployedthecurvatureasthestandardtodetectsharppointsandelabo

5、ratedthefundamentalsandnecessarysteps．Afterextractingthesharppointsfrompointcloud，thegridoptimizationmethodreservingfeaturesconsideringinternalboundariesandpointconstraintsisresearched．The鲥dqualitycriteriaissummarized．Twostepstooptimizethegridsareputforwardincludingtopologic

6、aloptimizationandgeometryoptimization．ThetopologicaloptimizationCanimprovelocal西dqualitywhiletheLaplacianoptimizationCanimproveoverall酣dquality．Intheend，examplesareproposedtoshowthequalityimprovementofgadsaftergridoptimizationwhilereservingfeatures．Aprogramtogeneratequadrila

7、teralmeshesfrompointcloudandoptimizegridsreservingfeaturesisdevelopedbasedontheabovetheoryandmethods．ThisprogramcalIgenerategirdseffectively．Thispapersummarizedtheexistingresearchandconcludedthreedifferentapproachestogenerategridsoffree—formstructures．Adiscussionandcategoriz

8、ationofthefundamentalmethodscurrentlyinusetogenerategridsoffree—formstructu