简介：Thehumanvisionsystemcanreconstructa3Dobjecteasilyfromsingle2Dlinedrawingsevenifthehiddenlinesoftheobjectareinvisible.Now,therearemanymethodshaveemulatedthisability,butwhenthehiddenlinesoftheobjectareinvisible,thesemethodscannotreconstructacomplete3Dobject.Therefore,weputforwardanewalgorithmtosettlethishardproblem.Ourapproachconsistsoftwosteps:(1)infertheinvisibleverticesandedgestocompletethelinedrawing,(2)proposeavertex-basedoptimizationmethodtoreconstructa3Dobject.

简介：今年暑期的大片一定还在你脑海中，不管是功夫熊猫2还是加勒比海盗4，变形金刚3或哈利波特7——我们都能感受到3D效果带给我们的震撼，貌似如果没有在名字后面加上3D，都不好意思称自己是大片。那么3D是什么，3D将为我们带来什么样的新生活体验呢？

简介：Thispaperpresentsanefficienttechniqueforprocessingof3Dmeshedsurfacesviasphericalwavelets.Morespecifically,aninput3Dmeshisfirstlytransformedintoasphericalvectorsignalbyafastlowdistortionsphericalparameterizationapproachbasedonsymmetryanalysisof3Dmeshes.Thissignalisthensampledonthespherewiththehelpofanadaptivesamplingscheme.Finally,thesampledsignalistransformedintothewaveletdomainaccordingtosphericalwavelettransformwheremany3Dmeshprocessingoperationscanbeimplementedsuchassmoothing,enhancement,compression,andsoon.Ourmaincontributionliesinincorporatingafastlowdistortionsphericalparameterizationapproachandanadaptivesamplingschemeintotheframeforprocessing3Dmeshedsurfacesbysphericalwavelets,whichcanhandlesurfaceswithcomplexshapes.Anumberofexperimentalexamplesdemonstratethatouralgorithmisrobustandefficient.

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简介：Thispaperpresentsadirectmethodtofindtheinternalfaces.Itusesfoursetsofinformation:1getthecoordinatesofeachpointonthe3Dcompositeobjects;2basedonthe3Dcoordinatestocalculatealltheplaneequationoftwoobjects;3calculatealltheintersectinglinesofthetwoobjectsandexcludetheintersectinglineswhicharenotwithinthescopeoftheplane;4findingtheinternalface,theremainingintersectinglinesformedtheplaneistheinternalfaceofthetwoobjects.Weproposedanewalgorithmforfindinginternalfaces.Thisalgorithmcouldbeadaptedtoanyregularcompositeobjects.Thealgorithmworkswellforfindinginternalfaces.

简介：要介绍Voxel3D,先得作个名词解释：Voxel是VolumeElement这两个词的缩写，我们把Voxel叫做“体元”，它就相当于二维图像中的“像素”，是三维空间中的基本小方块。

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简介：Aimingatachievingthehighaccuracy3Dmodelfromsliceimages,anewmodelreconstructionmethodusingsliceimagesisproposed.Wantingtoextracttheoutermostcontoursfromsliceimages,themethodoftheimprovedGVF-Snakemodelwithoptimizedforcefieldandraymethodisemployed.Andthen,the3Dmodelisreconstructedbycontourconnectionusingtheimprovedshortestdiagonalmethodandjudgmentfunctionofcontourfracture.Theresultsshowthattheaccuracyofreconstruction3Dmodelisimproved.

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简介：A3D-viewishelpfultoinstantlygraspwhatispresentedinadrawing.Thereexistavarietyofwaystopresentthesamepartwith3D-views.Tofacilitatethechoiceofanoptimumoneamongthem,theworkdividescompositesolidmodelsintothreecategories,soastoconveytheoriginalityofdesignconciselyandaccuratelybyusingtheleast'engineeringlanguage'.

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简介：7月27-31日，Siggraph2003——计算机图形图像业界最大规模的年度盛会，在美国加州的圣地亚哥举行，来自世界各地的动画师、艺术家、设计师、DV创作者、游戏开发者、教育者、后期制作专业人员，程序设计师、科学家和网络开发者齐聚一堂，共襄盛举。

简介：WormandwormgeararemodeledunderdevelopmentenvironmentinAutoCADbasedontheprincipleofordinarycylindricalwormdrive.ThedrawingcommandsavailableinAutoCADareusedtodevelopwormblankandcuttermodels.Thesolidmodelsofwormandwormgearareobtainedthroughtheuseofthecommands,move,rotateandsubtract,tosimulatethegeneratingcuttingmovementonthegearcuttingmachine.Autolisplanguageisutilizedinprogrammingforparametricmodelingofwormandwormgear.Thedevelopedprogramcanautomaticallydrawwormandwormgearwhenusersloadthewlwgprogram,inputthemodulusandthenumberofthreads,handedness,andotherparameters.Theoperationissimpleandaccurate,providingpotentialstospeedupproductdesignprocessandimproveefficiency.

简介：RapidForm2002是一款功能强大、易于使用的软件，使用户能够利用核磁共振或CT产生的3D扫描数据快速生成数字化模型，如果结合制模工艺，RapidForm就可以把设计和加工过程大大优化，可应用于包括航天、自动化、消费品、电子、娱乐、科研、医疗和牙齿矫正等相当广泛的领域。RapidForm2002在任何3D扫描处理中都将是一个关键组成部分一它先进的多边形和表面生成工具能使扫描数据被应用于任何3D软件中，从而充分释放了3D扫描的能量。

简介：3Dobjectscanbestoredincomputerofdifferentdescribingways,suchaspointset,polyline,polygonalsurfaceandEuclideandistancemap.Momentinvariantsofdifferentordersmayhavethedifferentmagnitude.Amethodfornormalizingmomentsof3Dobjectsisproposed,whichcansetthevaluesofmomentsofdifferentordersroughlyinthesamerangeandbeappliedtodifferent3Ddataformatsuniversally.Thenaccuratecomputationofmomentsforseveralobjectsispresentedandexperimentsshowthatthiskindofnormalizationisveryusefulformomentinvariantsin3Dobjectsanalysisandrecognition.

简介：Basedonthenecessityofthreedimensionalmodelingwithcomputerinteachingreform,thispaperisthesummarizationofreformpracticeofteachingengineeringdrawinginourinstitute.Theteachingreformbeginswiththreedimensionalmodelingthatusedcomputerinsteadofboard.Onthebasisoftargetofteachingreform,setofteachingcontent,arrangementofclasshourandteachingmethod,theresearchofteachingpracticehavebeendone,andverygoodeffectsinteachingofengineeringdrawinghavebeenachieved.

简介：据报道．欧洲知名的显卡厂商Club3D日前证实将与Ageia合作推出基于PhysX物理加速芯片(PPu)的游戏加速子卡产品．而这也应该是Ageia目前唯一曝光的PhysX子卡合作厂商。

简介：三维技术以前给人们的印象就是三维动画和CG作品，特别是三维动画，最深入人心，不过三维动画不具有交互性，不能指望依靠它实现什么互动功能。实时三维技术虽然在很早以前就有了，但主要用于游戏开发、军事科研、大型仿真等领域。

简介：网络为我们带来了新的学习方式,但是其平面的知识呈现方式激发不了学习者太多兴趣,X3D技术以其逼真的三维体验给学习者带来了前所未有的乐趣,本文探讨了X3D技术在网络体验式教学中的应用前景。