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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。

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简介：一般而言选取3-D建模及渲染程序时有两种选择，一整套丰富功能或者是廉价的产品（不足400美元）。但售价仅为399美元的PixelsDigital的Pixels3D5.0版却打破了这一规律，同Eovia'sCarraraSrudio（2002年11月）等低端3-D程序类似Pixels3D具有用户友好的界面，便于访问各种工具和功能。其弹出菜单功能在很大程度上同Alias的MayaComplete中的对象选取模式下的HotBox弹出菜单非常相似（2003年1月）。

简介：２Ｄ／３ＤＩｓｏｍｅｔｒｉｃＴｒａｎｓｆｏｒｍａｔｉｏｎＵｓｉｎｇＳｐｒｉｎｇ＿ＭａｓＳｙｓｔｅｍＦａｎＪｉｎ１ＭａｔｈｅｗＭ．Ｆ．Ｙｕｅｎ２ＱｉｆｕＷａｎｇ１ＺｈｏｕＪｉ１１ＴｈｅＣＡＤＣｅｎｔｅｒｏｆＴｈｅＨｕａｚｈｏｎｇＵｎｖｉｅｒｓｉｔｙｏｆ...

简介：Theboundaryelementmethodforthemodalanalysisoffreevibrationfor3-Danisotropicstructuresusingparticularsolutionshasbeendeveloped.Thecompletepolynomialsofordertwoareusedtoconstructtheparticularsolutionsforgeneralanisotropicmaterials.Thenumericalresultsfor3-Dfreevibra-tionanalysisofanisotropiecantileverbeambythemethodpresentedisingoodagreementwiththeresultsus-ingtheRitztechnique.Foranisotropicmaterials,thenumericalresultscalculatedfromtheproposedmethodareingoodagreementwiththeresultsfromMSC.NASTRAN.

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，

简介：Inthispaper,perturbationmethodandFourier-cosine-expansionmethodareusedtosolvea3-DnonlinearproblemofasupercavitatingflowinaninclinedfieldofgravityatlargeFroudenumbers.Byexpandingthevelocitypotentialintoapowerseriesofasmallparameter,theoriginal3-Dnonlinearproblemisreducedtoanumberof2-Dones.Thesolutionsofthefirstthreeordersarederivedindetailandexpressedintermsofthecompleteellipticintegralsofthefirstandsecondkinds.Thentheboundaryintegralequationmethodisappliedtogetthenumericalsolutionsforeachorder.Computationalresultsareprovidedforsupercavitatingflowspastconesundervariousflowconditions.

简介：Inthispaper,a3Dsourcedistributiontechniqueisusedtocalculatethecoupledmotionsbetweentwoshipswhichadvanceinthewavewiththesamespeed.Thenumericalresultsofcoupledmotionsforafrigateandasupplyshiphaveagoodagreementwiththeexperimentalresults.Basedonthe3Dcoupledmotionsoftwoships,aspectralanalysisisemployedtoclearlyobservetheeffectofspeed,clearanceandwaveheadingonthesignificantrelativemotionamplitude(SRMA)oftwoships.Themethodpresentedinthispaperwillbehelpfultoselectsuitableclearance,speedandwaveheadingforunderwayreplenishmentatsea(RAS).

简介：Thispaperpresentsanewalgorithmforgenerating3DimagesofB-repsobjectswithtrimmedsurfaceboundaries.The3Dimageisadiscretevoxel-maprepresentationwithinaCubicFrameBuffer(CFB).Thedefinitionof3Dimagesforcurve,surfaceandsolidobjectareintroducedwhichimplytheconnectivityandfidelityrequirements.AdaptiveForwardDifferencingmatrix(AFD-matrix)for1D-3Dmanifoldsin3Dspaceisdeveloped.BysettingrulestoupdatetheAFD-matrix,theforwarddifferencedirectionandstepwisecanbeadjusted.Finally,anefficientalgorithmispresentedbasedontheAFD-matrixconceptforconvertingtheobjectin3Dspaceto3Dimagein3Ddiscretespace.

简介：3D磁电机的工作量碲的向前当模特儿的算法那么大传统的连续算法花费一极其大计算时间。然而，向前为算法建模的3D能在频率域处理数据，它对平行计算很合适。与MPI并且基于3D磁电机的流动的分析的优点碲的连续前面的算法，我们建议平行计算的想法并且使用它。三个理论模型被测试，实行效率处于不同状况被比较。结果显示向前为计算建模的平行3D是正确的，效率极大地被改进。这个方法对大尺寸合适地球物理的计算。

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简介：Seismicdataacquiredinseabeachwasaffectedbylargevariationsinnear-surfacemedia,seriousreceiverdrifting,serioushigh-frequencynoises,heavymultiples,complexsubsurfacegeologyanddifficultiesinimaging.BGPResearchInstitute,havingworkedonthecorrespondingissuesforseveralyears,hascompletedaseriesofcomplexseabeach3Dseismicinterpretationapproachesincludingsyntheticseismiccalibrationwithdirectionalwelldata,analysisofstressfield,correlatinginterpretationwithmulti-screenmulti-linerecursion,

简介：一、3D虚拟形象系统简介Avatar即虚拟形象，是玩家在游戏、网站、社区上面的虚拟形象，玩家通过购买多种多样的服饰来装扮自己。Avatar现状以“QQ秀”为代表席卷着众多的游戏、门户、社区等，他们均是2D贴图的虚拟形象，此类的虚拟形象具有同质化极其严重，表现形式单一效果平平，技术水平不高，工作量大且维护起来耗时耗力等众多的弊病。

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。

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简介：Objective:ToevaluateandcomparethediagnosticvalueinatlantoaxialsubluxationbyCTthree-dimensional(3D)reconstruction.Methods:3Dreconstructionfimdingsof41patientswithatlantoaxiaisubluxationwereretrospectivelyanalyzed,andcomparisonsweremadeamongimagesoftransversesection,multiplanarreformorting(MPR),surfaceshadedisplay(SSD),maximumintensityproject(MIP),andvolumerendering(VR).Results:Of41patientswithatlantoaxialsubluxation,31belongedtorotarydislocation,5antedislocation,and5hinddislocation.Allthecasesshowedthedislocatedjointpanelofatlantoaxialarticulation.Fifteencasesshoweddeviationoftheodontoidprocessand8caseswideneddistancebetweenthedensandanteriorarchoftheatlas.ThedislocatedjointpanelofatlantoaxialarticulationwasmoreclearlyseenwithSSD-3Dimagingthananyothermethods.Conclusions:AtlantoaxialsubluxationcanwellbediagnosedbyCT3Dreconstruction,inwhichSSD-3Dimagingisoptimal.

简介：Airborne3DimagewhichintegratesGPS,attitudemeasurementunit(AMU),scanninglaserrangefinder(SLR)andspectralscannerhasbeendevelopedsuccessfully.ThespectralscannerandSLRusethesameopticalsystemwhichensureslaserpointtomatchpixelseamlessly.Thedistinctiveadvantageof3Dimageisthatitcanproducegeo_referencedimagesandDSM(digitalsurfacemodels)imageswithoutanygroundcontrolpoints(GCPs).ItisnolongernecessarytosurveyGCPsandwithsomesoftwaresthedatacanbeprocessedandproducedigitalsurfacemodels(DSM)andgeo_referencedimagesinquasi_real_time,therefore,theefficiencyof3Dimageis10～100timeshigherthanthatoftraditionalapproaches.Theprocessingprocedureinvolvesdecomposingandcheckingtherawdata,processingGPSdata,calculatingthepositionsoflasersamplepoints,producinggeo_referencedimage,producingDSMandmosaicingstrips.　Theprincipleof3Dimageisfirstintroducedinthispaper,andthenwefocusonthefastprocessingtechniqueandalgorithm.Theflighttestsandprocessedresultsshowthattheprocessingtechniqueisfeasibleandcanmeettherequirementofquasi_real_timeapplications.

简介：为波浪领域推测的一个精确、宽角度的单程的增殖者面对大、快速的速度变化是为关于波浪方程prestack深度移植的研究的一个重要话题。基于在这篇论文介绍的最佳的可分离的近似，有前面、反的Fourier变换的混合的域算法被用来构造3D单程的波浪领域推测操作员。这个操作员在波浪号码和空间领域分开变量。当为侧面的速度变化的时间延期在空间领域被改正时，阶段移动操作在波浪数字领域被实现。单程的波浪操作符的推动回答证明数字计算与为每速度的理论值一致，表明与最佳的可分离的近似构造的操作符能被用于为小步的盒子的侧面的速度变化。SEG/EAGE模型和领域数据的成像结果显示新方法能习惯于图象建筑群结构。

简介：Inrecentyears,thevolumetricapproachof3Dreconstructionhasemergedasapowerfulclinicmethodforbiomedicalapplications.Thisapproachisbasedonavoxelrepresentedobjectwhichmaintainsmanydetailsofthesurfaceandtheinternalcon-structuresoftheoriginalbody.Becauseofahugeamountofdata,thevolumedatasettakesalargesizeofmemory,andahighprocessingspeedisrequiredinorderto