基于opengl的线路三维动态可视化分析

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1、基于OpenGL的线路三维动态可视化研究Abstract3Dvisualization1Sanimportantdirectionofresearchinthefieldofcomputergraphics．Manyresearchershavebeencarryingoutalotoffruitfulresearches，andithasbeenawiderangeofapplicationsanddevelopmentincomputingandengineering，buttheyseldomhavereal—timevisuali

2、zationdesign．Soweneedtofurtherperfectthecomputer-aideddesignoftherailwayline，researchingthedesignanddevelopmentofline3Dvisualizationhasgreatsignificance．Thispaperresearchesthecalculationofthecurvelineelements，themainpointofmileage，coordinateofpileandtangentazimuth．Asectio

3、nofPingtantoShanweirailwayasanexampleisstudied，theplaneandthelongitudinalofthelinehasbeendrawed．Acriticalstepofline3Dvisualizationistobuildthemodel，Firstofall，inthesubgrademodling，thesubgrademodleisbuildedthroughthesectionofstandardsubgradecrosssection，threedimensionalcoo

4、rdinatesoffeaturepointsisgetbythegeometricrelationshipofthefeaturepointsinthecrosssectionofthesubgradecenterline．Inthetunnelmodeling，wireframemodelisusedtosimulatetunnel，wireframemodelisamethodwhichrepresentthevisualof3Dobjectsincomputergraphics．Generallyspeaking，wirefram

5、emodelisamodeofrepresentingthegeometryusingofedgesandverticesoftheobject．Andthenthesmoothoftheformationandthejunctiontummlisachievedthoughloadingrotationsectiononthemiddlepart．Inbridgemodeling，thoughanalysisofthegravitybridgepier,bridgepiermodelisbuildedbyconstructingsome

6、polygonsandareferencepointofbridgepier．Bridgerailingsmodelingisrealizedbydrawinglinesandcylinder．Finallythetotalbridgemodelingforms．Thisthesishasrealizedthe3DlinedrawingCombiningOpenGLandMFCinVisualC++6．0environment．Finallyarealisticlineisdrawedusingcriticaltechnologyofth

7、eilluminationmodel，projectiontransformation，texturemapping，displaylistanddoublebufferofOpenGL．Itrealizestheline3Dreal—timedynamicvisualization．Wecanroamchoosingalongthepathoftheprogramline．Thisstudyhasimportantpracticalsignificance，itprovideareferenceforengineeringapplica

8、tions，graphicaldatavisualizationandsimulation．Wecanresearchthefeasibility，accuracyandpracticalit