Ref:9900-1-M3FS14FastSHAPES- SURFACE32BitTYPICALAPPLICATIONSInmarinearchitecture,chinedhullsIngeneralarchitecture,sculpturesandartformsInbulkmaterialshandling,chutes,bins,hoppersInfluidsconveying,ducts,transitions,transformersInstructuralfabrication,websorflangesofcurvedand/orcamberedtrapezoidalplateboxgirders.Generally,wherevertheedgesofasinglycurved(ruled)surfaceorsetofsurfacesaredefined.(SURFACEdoesnothandledoublycurvedsurfaces)TECHNICALDESCRIPTIONSURFACEusesthetriangulationmethodtodevelopsurfacesdefinedbytwocurvesingeneral3dimensionalspace.Aseriesofuptotwentyadjacentsurfaceswithcommoncurvesbetweenthemmaybedeveloped.Eachcurvemaybeopenorclosed.Inmarinearchitecture,thesecurvesareknownas`chines’.Moregenerally,theyarecircumferentialortransverseseamsoredges.Itisassumedthatthecurvesrepresentthemid-thicknessoftheplates,henceplatethicknessdoesnotspecificallyenterintothedevelopmentofthesurfaces.Pointcoordinatesalongeachcurve,asprovidedbytheuser,maybeacceptedasgiven.Alternatively,thecurvesmayberegeneratedbyspliningthroughthegivenpoints,orbyforcinguseofcircularspacearcs.Whenspliningisspecified,anuntensionedcubicsplineisused.Thismaybecyclic,anti-cyclic,free-ended,orclamped(endssettospecifieddirections)Further,whenspliningisused,theusermayopttoretainallspecifiedpointsandbreakthecurvesintoaspecifiednumberofintervalsbetweengivenpoints,ormayelecttoforegoallgivenpoints,andbreakeachcurveintothesamespecifiednumberoftotalintervals.(Thesplinedcurveremainspassingthroughtheoriginalpoints,buttheoriginalpointsarenolongeraccessible.)Theuserisresponsibletoensurethatanadequatenumberofintervalsisdefinedalongeachcurve,soastoensurethatdifferencesbetweenchordlengthsusedindevelopmentbytriangulation,andactualarclengths,areatanacceptablysmalllevelfortheintendedpurpose.Eachofthesurfacesmaybedissectedintosegmentsbyinsertionoflongitudinalseamsthroughanyspecifiedpointpair.Greenmaybeaddedtoanyedge.Aplatelistshowingboundingrectangularsizesisprovided.AllsubstantivedatarequiredbySURFACEmaybepreparedexternallytotheprogram(e.g.withina3DCADprogram,orotherwisebyaprogramsuchasBASIC,PASCAL,etc.),andimportedonrequestoftheuser.Ascalingfactormaybeappliedtoconvertbetweendatasystems.Adatageneratorisprovidedtodemonstrateseveraldatastructures,andasageneralutilityforsurfacesofrevolution.Continued….
FastSHAPES- SURFACEDATAREQUIREMENTSSizeofpointcoordinatetable(Numberofcurves,Numberofpointspercurve)tobedefined.SpliningparametersScalingfactor.GreenforeachedgeTableofpointcoordinates(Points/curvexnumberofcurves,inX,Y,Zspace)Tableofcurveendvectors(X.Y,Zdirectionatendofeachcurve,)OUTPUTPatternsinanyofthefollowingforms...FastCAMfile2DDXFfile,3DDXFFileNCProgramCoordinateTablePROGRAMREFERENCEM3FS14:SURFACEOTHERREFERENCESM3FS7:RECTIRCLE(Generalshape transitions and transformers)M3FS11:BEND(Generalgoredbends)
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