简介：Thispaperpresentsanewapproachforattenuatingcoherentnoisein3Dseismicdata.Anadaptivebeamformingwithgeneralizedsidelobecanceller(GSC)designmethodologyisutilizedhereasageneralformoflinearlyconstrainedadaptivebeamformingstructure.Itconsistsofafixedbeamformer,andasignal-blockingmatrixinfrontofanunconstrainedadaptivebeamformer.Considerationfofthecomplexityofthegeometryfor3Dseismicsurvey,the3DbeamformingwithGSCtechniqueisdevelopedwithtwokeypoints:(1)sortingalongazimuthsectionstosimplifytherelationshipbetweentraveltimeandoffsetfrom3Dto2D,and(2)dynamicbinningschemetoavoidthepossiblepoorfoldinginsomeazimuthsections.Bothsimulationresultandrealdataexampleshowthatthenewlydeveloped3DbeamformingwithGSCyieldsmorecredibleresultsatarelativelowcost,sufficientstabilityandgoodresolution.

简介：三维真实感的图形技术是科学计算可视化、电脑动画和三维地理信息系统的核心.三维GIS是GIS领域的一个热门话题,而它最基本的技术便是三维可视化技术.结合应用实例,讨论了JAVA3D技术的一些概念,及其在三维图形制作上的优点.

简介：在我们的日常生活中，大家不可避免要接触到两大类的场景环境。一种是由于人类有意识或无意识的雕琢而形成的人为场景现象——“人工场景”，如：人工建筑、草地上人类行走所留下的痕迹……另一种是由于大自然的力量所营造出来的天然场景现象——“自然场景”，如：山、水、草地、天空……这两种场景的有机结合形成了我们的生活空间。

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简介：Thispaperisconcernedwiththewavesgeneratedbya3-Dbodyadvancingbeneaththefreesurfacewithconstantspeedinatwo-layerfluidoffinitedepth.ByapplyingGreen'stheorem,alayeredintegralequationsystembasedontheRankinesourcefortheperturbedvelocitypotentialgeneratedbythemovingbodywasderivedwiththepotentialflowtheory.Afour-nodeisoparametricelementmethodwasusedtotreatwiththesolutionofthelayeredintegralequationsystem.Thesurfaceandinterfacewavesgeneratedbyamovingballwerecalculatednumerically.Theresultswerecomparedwiththeanalyticalresultsforamovingsourcewithconstantvelocity.

简介：二维地理信息系统远远不能满足人们的要求，取而代之的是建立空间的立体的三维GIS。不规则四面体被认为是最简单的数据表示方法之一，本文就三维Delaunay剖分及其在GIS中的应用作了阐述。

简介：Thispaperproposesapracticalalgorithmsofplanecutting,stereoclippingandarbitrarycuttingfor3Dsurfacemodelreconstructedfrommedicalimages.Inplanecuttingandstereoclippingalgorithms,the3Dmodeliscutbyplaneorpolyhedron.Listsofedgeandvertexineverycutplaneareestablished.Fromtheseliststheboundarycontoursarecreatedandtheirrelationshipofembraceisascertained.TheregionclosedbythecontoursistriangulatedusingDelaunaytriangulationalgorithm.Arbitrarycuttingoperationcreatescuttingcurveinteractively.Thecutmodelstillmaintainsitscorrecttopologystructure.Withtheseoperations,tissuesinsidecanbeobservedeasilyanditcanaiddoctorstodiagnose.Themethodscanalsobeusedinsurgeryplanningofradiotherapy.

简介：AdobelllustratorCS在10的基础上新增了很多好用的功能，3D渲染的加入应该说是一个亮点。呵呵，下面利用这个功能制作一个酒杯，来简单地说lllustratorCS的3D放样的使用……

简介：为适应科技进步和社会发展的需求，航测生产即由传统的模拟生产向数字化生产转变，产品形式也由单一的模拟图向以DLG、DEM、DOM为主体的数字产品转化。

简介：SystemoptimizationplaysacrucialroleindevelopingVRsystemafter3Dmodeling,affectingthesystem'sImmersionandInteractionperformanceenormously.Inthisarticle,severalkeytechniquesofoptimizingavirtualminingsystemwerediscussed:optimizing3DmodelstokeepthepolygonnumberinVRsystemwithintargethardware'sprocessingability;optimizingtexturedatabasetosavetexturememorywithperfectvisualeffect;optimizingdatabasehierarchystructuretoacceleratemodelretrieval;andoptimizingLODhierarchystructuretospeeduprendering~

简介：众所周知Photoshop是一个平面设计软件，但是通过其“3D变换”滤镜也可以创建一些简单的3D效果。“3D变换”滤镜提供了“长方体”、“球体”和“圆柱体”三种标准模型，除此之外还可以通过节点笔记工具对模型进行修改，创建更多的立体效果。下面我们将使用该滤镜绘制一枝铅笔。

简介：TheDevelopmentof3DCADtechnologypresentsaneweffectivetoolindesigningoutdoorswitchyardforpowerplant.Anewlayoutpatternof330kVswitchyard(SWYD)ofalignedtypewasstudiedwiththismethod.Someissuesaboutcomputerized3DmodesappliedinSWYDdesignarealsodiscussedinthispaper.

简介：利用3dsmax软件制作建设效果图,在绘制三维图形时,应用AutoCAD绘制三维实体;光源进行模拟以达到逼真效果;玻璃制作,前面应用玻璃材质,在玻璃后面做一个形同此墙的物体贴上反射图片;背景处理,在Photoshop中处理效果更加逼真。

简介：3Dstructureofthecrustanduppermantleinthestudiedareahasbeenanalyzedfromsurfacewavetomography.Thevelocitydistributionintheuppermostcrustissymmetricalontwosidesofthecentrallineofthesea,andcoincideswiththestructureofcrystallinebasement.TheessentialdifferenceintectonicsbetweentheEastChinaSeaandtheYellowSeamainlyliesinthatthevelocitystructuresoftheirlowercrustanduppermantleareidenticaltothoseofSouthChinaandNorthChinarespectively.Intheuppermantlethereexistsahigh-velocityzonewithanearlyEWstrikefromtheHangzhouBay,China,totheTokaraChannel,Japan,alongaboutthelatitudeof30°N.ItisfoundthatbetweentheEastChinaSeaandtheYellowSeatherearesystematicaldifferencesingeomorphology,geology,seismicity,heatflow,qualityfactorandgravityandaeromagneticanomalies,whichisrelatedtobothleft-lateralsheardislocationandright-lateraltearoftheBenioffzonefromtheHangzhouBaytotheTokaraChannel.ItisinferredthattheEastChinaSeawasformedbyCenozoicback-arcextension.TheboundarybetweentheNorthChinaandSouthChinacrustalblocksstretchesalongthesouthernpiedmontofMts.Daba-Dabie-HangzhouBay-TokaraChannel,andthesubductionzoneattheOkinawatrenchistheeasternboundaryoftheSouthChinacrustalblock.ThemovementsofthePacificplate,IndianplateanduppermantleratherthanthePhilippineplatesubductionhaveplayedadominantroleforthemoderntectonicmovementsinEastAsia.

简介：Anovelno-guidelightpentype3D-coordinatemeasurementsystemwiththreesetsofpositionsensitivedevices(PSDs)torealizeintersectionconvergeinagingisintroduced.Itiscalledasthelightpentypemeasurementsystem,becausethemeasuringheadisshapedasapenwithseverallightsourcesonit.Thestructuredesign,measurementprincipleandexperimentalresultsarepresented.Thetheoreticalanalysisandexperimentalresultsprovethatthissystemhasadvancedfeaturesofsimplestructure,highautomation,andhighaccuracy,andcanbeusedinthemeasurementfieldsofmechanicalmanufacture,robot,auto,aviationandmedicineeffectively.

简介：3D技术如今已经是相当的普及，各种类型的游戏都能见到它的影子，其中以FPS和RTS两个类型游戏的表现力量最为出色，在这两个类型的游戏当中，开发者使用了大量最新的图形技术，使得游戏的画面非常出色，因此使得游戏的品质也得到了一个质的飞跃。诸如HDR-高动态范围，体积雾化，测定空间式生成阴影等技术，完全要拜DirectX9的SM3.0所赐。然而RPG游戏的3D化进程是相当缓慢的。也许是因为开发者不愿意投入技术，而将更多精力投入到游戏的可玩性上。去年发售的《神鬼寓言》是非常出色的，但是缺少了绚丽的SM3.0特效，感觉还是有遗憾的。然而除了《神鬼寓言》，离我们最近的RPG大作就是很多年前的《无冬之夜》了，这也许是RPG厂商都转向了网络游戏，很少开发单机RPG的缘故吧，不过就在最近，RPG游戏开始崛起了，代表作品就是《哥特王朝Ⅲ》。

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简介：Basedonrigid-plasticfiniteelementmethod,askewrollingprocessofsteppedpartissimulated.Consideringnodesavingandeffectiveremeshing,thetetrahedronsolidelementsareusedtodiscreteworkpiece.Theworkpiecematerialadoptsrigid-plasticmodel,wheretheflowstressisfunctionofeffectivestrain,effectivestrainrateandtemperature.Thethermomechanicalcouplingisconsideredinthesimulation.Tomodelthespinningworkpieceundergoingplasticdeformation,anovelsolutionispresentedandappliedinthispaper.Thestressstateintheworkpieceandformingcharacteristicofskewrollingareanalyzed.Theformingload,includingrollertorqueandforcesinthreedirectionsarepredicted.Theaboveanalysesarehelpfultounderstandingofformingmechanismsandimprovingofprocessanddiedesign.

简介：在游戏角色制作中．由于模型精度的限制使得角色无法达到影片中逼真完美的程度．角色贴图的制作便起到非常重要的作用。好的贴图效果能使一个玩家置身于逼真的虚拟世界。

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