简介:Thispaperpresentsanewalgorithmforgenerating3DimagesofB-repsobjectswithtrimmedsurfaceboundaries.The3Dimageisadiscretevoxel-maprepresentationwithinaCubicFrameBuffer(CFB).Thedefinitionof3Dimagesforcurve,surfaceandsolidobjectareintroducedwhichimplytheconnectivityandfidelityrequirements.AdaptiveForwardDifferencingmatrix(AFD-matrix)for1D-3Dmanifoldsin3Dspaceisdeveloped.BysettingrulestoupdatetheAFD-matrix,theforwarddifferencedirectionandstepwisecanbeadjusted.Finally,anefficientalgorithmispresentedbasedontheAFD-matrixconceptforconvertingtheobjectin3Dspaceto3Dimagein3Ddiscretespace.
简介:Thetraditionalstrategyof3Dmodelreconstructionmainlyconcentratesonorthographicprojectionsorengineeringdrawings.Buttherearesomeshortcomings.Suchas,onlyfewkindsofsolidscanbereconstructed,thehighcomplexityoftimeandlessinformationaboutthe3Dmodel.Theresearchisextendedandprocesscardistreatedaspartofthe3Dreconstruction.Asetofprocessdataisasupersetof2Dengineeringdrawingsset.Thesetcomprisesprocessdrawingsandprocesssteps,andshowsasequencingandasymptoticcoursethatapartismadefromroughcastblanktofinalproduct.Accordingtothesecharacteristics,theobjecttobereconstructedistranslatedfromthecomplicatedengineeringdrawingsintoaseriesofmuchsimplerprocessdrawings.Withtheplentifulprocessinformationaddedforreconstruction,thedisturbancessuchasirrelevantgraph,symbolandlabel,etc.canbeavoided.Andmore,theformchangeofbothneighborprocessdrawingsissolittlethattheengineeringdrawingsinterpretationhasnodifficulty;inaddition,theabnormalsolutionandmulti-solutioncanbeavoidedduringreconstruction,andtheproblemsofbeingapplicabletomoreobjectsissolvedultimately.Therefore,theutilitymethodfor3Dreconstructionmodelwillbepossible.Ontheotherhand,thefeatureinformationinprocesscardsisprovidedforreconstructionmodel.Focusingonprocesscards,thefeasibilityandrequirementsofWorkingProcedureModelreconstructionisanalyzed,andthemethodtoapplyandimplementtheNaturalLanguageUnderstandingintothe3Dreconstructionisstudied.Themethodofasymptoticapproximationproductwasproposed,bywhicha3Dprocessmodelcanbeconstructedautomaticallyandintelligently.Theprocessmodelnotonlyincludestheinformationaboutpartscharacters,butalsocandelivertheinformationofdesign,processandengineeringtothedownstreamapplications.