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86 个结果
  • 简介:Resortingtocubicsplinefunctioninsteadofparametricsplinerepresentation,anexplicitfairnessindicatorandanefficientfairingalgorithmfor2Dcurvesarepresented.Theinputpointsequenceisfirstlypartitionedintoseveraloverlappedfunctionsegments.Foreachsegment,acubicsplinefunctionisusedastherepresentationtoolwhichentailsapolylineapproximationofcurvatureplot.Basedontheextrinsicrelationshipbetweenthepolylineandthepositionsofdatapoints,acoarse-to-finefaringmethodisproposedwhichefficientlyidentifiesandeliminatestheunnecessaryinflectionpoints.Ouralgorithmgeneratesthebestresultstodate,whichisvalidatedbynumerouspracticalexamples.

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  • 简介:在上一期中,我们已经介绍了X3D、PowerSketch等技术,这期我们再来看一下面向在线游戏的WildTangent、平面软件资深开发公司Adobe的Atmo-sphere以及EON、Virtools等Web3D的又一支力量。

  • 标签: 三维游戏 游戏制作 软件开发 动画制作
  • 简介:作为一套完整的3D解决方案,LightWave3D被遍及全球的用户广泛应用于广播图像、游戏、印刷、网络和影视特效等领域。就在前不久,NewTek公司凭借LightWave摘取了本年度“艾美”工程大奖,7月底的SIGGRAPH203产品展览会上,

  • 标签: LIGHTWAVE 3D 预览 Tek公司 影视特效 NEW
  • 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.

  • 标签: 3D模型 自然语言理解 计算机程序 加工处理
  • 简介:从本期起,CGReview将特别推出专题Review,以系统介绍CG中的专门领域。先号召一下,欢迎各位身怀“绝技”的发烧友们来此一展拳脚!投稿Mail:shitao@newcg.com。今天首先出场的是realrocking主持的Web3d

  • 标签: VR CG 系统 发烧友 领域 世界
  • 简介:Analgorithmforcompensatingthevaryingsectioncontourwithintheextentofeachlayerthicknessisproposedtoimprovetherapidprototypingpart’sshapeandsizeprecision.

  • 标签: RAPID PROTOTYPING (RP) 3D CAD model
  • 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?

  • 标签: 3D显示 视界 生活 3D效果 变形金刚
  • 简介:不久前,笔者狠下心花一大笔银子订购了一台戴尔的9100台式机,总算是鸟枪换炮了,但家中原有的P2450台式机和2001年添置的联宝笔记本一直不舍得扔到车库中去,怎说也可以让家人闲来无事上网玩玩。于是,利用一个双休日去电脑公司将D-Link的DI-504宽带路由器请回家,这是一台有线路由器,但是在使用和设置过程中遇到了一些棘手的问题,使笔者这个号称大虾的人物也走了一段弯路,这是怎么一回事呢?

  • 标签: D-LINK 宽带路由器 设置过程 台式机 笔记本 电脑
  • 简介:Thispaperpresentsanefficienttechniqueforprocessingof3Dmeshedsurfacesviasphericalwavelets.Morespecifically,aninput3Dmeshisfirstlytransformedintoasphericalvectorsignalbyafastlowdistortionsphericalparameterizationapproachbasedonsymmetryanalysisof3Dmeshes.Thissignalisthensampledonthespherewiththehelpofanadaptivesamplingscheme.Finally,thesampledsignalistransformedintothewaveletdomainaccordingtosphericalwavelettransformwheremany3Dmeshprocessingoperationscanbeimplementedsuchassmoothing,enhancement,compression,andsoon.Ourmaincontributionliesinincorporatingafastlowdistortionsphericalparameterizationapproachandanadaptivesamplingschemeintotheframeforprocessing3Dmeshedsurfacesbysphericalwavelets,whichcanhandlesurfaceswithcomplexshapes.Anumberofexperimentalexamplesdemonstratethatouralgorithmisrobustandefficient.

  • 标签: 三维网格 球面小波 表面加工 网状 自适应采样 参数化方法
  • 简介:Thispaperpresentsadirectmethodtofindtheinternalfaces.Itusesfoursetsofinformation:1getthecoordinatesofeachpointonthe3Dcompositeobjects;2basedonthe3Dcoordinatestocalculatealltheplaneequationoftwoobjects;3calculatealltheintersectinglinesofthetwoobjectsandexcludetheintersectinglineswhicharenotwithinthescopeoftheplane;4findingtheinternalface,theremainingintersectinglinesformedtheplaneistheinternalfaceofthetwoobjects.Weproposedanewalgorithmforfindinginternalfaces.Thisalgorithmcouldbeadaptedtoanyregularcompositeobjects.Thealgorithmworkswellforfindinginternalfaces.

  • 标签: 三维坐标 FACES 算法 基础 3D 平面方程
  • 简介:Aimingatachievingthehighaccuracy3Dmodelfromsliceimages,anewmodelreconstructionmethodusingsliceimagesisproposed.Wantingtoextracttheoutermostcontoursfromsliceimages,themethodoftheimprovedGVF-Snakemodelwithoptimizedforcefieldandraymethodisemployed.Andthen,the3Dmodelisreconstructedbycontourconnectionusingtheimprovedshortestdiagonalmethodandjudgmentfunctionofcontourfracture.Theresultsshowthattheaccuracyofreconstruction3Dmodelisimproved.

  • 标签: 切片图像 三维模型 重建方法 SNAKE模型 外轮廓 射线法
  • 简介:A3D-viewishelpfultoinstantlygraspwhatispresentedinadrawing.Thereexistavarietyofwaystopresentthesamepartwith3D-views.Tofacilitatethechoiceofanoptimumoneamongthem,theworkdividescompositesolidmodelsintothreecategories,soastoconveytheoriginalityofdesignconciselyandaccuratelybyusingtheleast'engineeringlanguage'.

  • 标签: 三维视图 固体模型 复合 配备 演示 优化