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1、IntJAdvManufTechnol(1998)14:269-279Thehlterrtationa~3o.rnalof©1998Springer-VerlagLondonLimitedAdvancedfflanufacturingTechnologuCreatingMachinableTexturesforCAD/CAMSystemsChowKinYean,*ChuaCheeKai,tTerryOng*andLinFengt*DelcamInternationalPLC,Birmingham,UK;and+NanyangTechnologicalUni
2、versity,SingaporeTextureisapp,!iedonthree-dimensionallymodelledsurfacesinfacese.g.BeziersurfacesIll,NURBsurfaces[2]andG~computergraphicstoenhancevisualeffect.Thisresearchsurfaces[3].focusesonthedevelopmentofthree-dimensionaltexturedsur-Incomputergraphics,textureisaddedtothecomplex
3、surfacefaceswhicharesuitableformanufacturing.Threeapproachestomakethepartappearmorerealistic.Theincorporationofforcreatingthethree-dimensionaltexturearepresented.textureonthemodelledsurfaceenhancesthevisualeffectofThefirstapproachistoprocessadesignfromeitheranthemodelledpart.Thisi
4、mprovesthegraphicssimulationofartist'ssketchoranimagefromatwo-dimensionalscan.Thethepartasarealobject.Currently,mosttexturingtechniquessecondapproachusesathree-dimensionalscannedtexture.aresimilartoeithersolidtexturing[4]orbumpmapping[5].Boththeseapproachesdependonthequalityofthes
5、cannedThesetexturingtechniquesdonotprovideathree-dimensionalimageandaremoretediousthanthethirdapproach,whichrepresentationofthetexturedsurface.Thisimpliesthattheistoconverttextureusingparametersandisamoredirecttexturedsurfacemodelledcannotbemanufactured,thatis,theapproach.Intheuse
6、rinterfacedesign,twocustom-madeformstextureitselfcannotbemachined.Therefore,thereisaneedaredevelopedtocaterforbothregularandirregulartextures.tocreatea"real"three-dimensionaltexturewhichcanbeThecasestudieshaveshownthatthetexturescreatedaremachined.notonlygoodforavisualeffect,butar
7、ealsomachinable.Therearetwomaincategoriesoftexture-"macrotexture"ThedevelopmentworkisincorporatedintotheArtCAMsystemand"microtexture"[6]."Macrotexture"referstosurfaceprimi-whichisaspecialisedCAD~CAMsystemthatiscapableoftivesthataregovernedbyspecificplacementrules,whereasgenerating
8、three-dimensionalshapesfromtwo-di
