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1、IntJAdvManufTechnol(1998)14:269-279Thehlterrtationa~3o.rnalof©1998Springer-VerlagLondonLimitedAdvancedfflanufacturingTechnologuCreatingMachinableTexturesforCAD/CAMSystemsChowKinYean,*ChuaCheeKai,tTerryOng*andLinFengt*DelcamInternationalPLC,Birmingham,UK;and+Nan
2、yangTechnologicalUniversity,SingaporeTextureisapp,!iedonthree-dimensionallymodelledsurfacesinfacese.g.BeziersurfacesIll,NURBsurfaces[2]andG~computergraphicstoenhancevisualeffect.Thisresearchsurfaces[3].focusesonthedevelopmentofthree-dimensionaltexturedsur-Incom
3、putergraphics,textureisaddedtothecomplexsurfacefaceswhicharesuitableformanufacturing.Threeapproachestomakethepartappearmorerealistic.Theincorporationofforcreatingthethree-dimensionaltexturearepresented.textureonthemodelledsurfaceenhancesthevisualeffectofThefirs
4、tapproachistoprocessadesignfromeitheranthemodelledpart.Thisimprovesthegraphicssimulationofartist'ssketchoranimagefromatwo-dimensionalscan.Thethepartasarealobject.Currently,mosttexturingtechniquessecondapproachusesathree-dimensionalscannedtexture.aresimilartoeit
5、hersolidtexturing[4]orbumpmapping[5].BoththeseapproachesdependonthequalityofthescannedThesetexturingtechniquesdonotprovideathree-dimensionalimageandaremoretediousthanthethirdapproach,whichrepresentationofthetexturedsurface.Thisimpliesthattheistoconverttextureus
6、ingparametersandisamoredirecttexturedsurfacemodelledcannotbemanufactured,thatis,theapproach.Intheuserinterfacedesign,twocustom-madeformstextureitselfcannotbemachined.Therefore,thereisaneedaredevelopedtocaterforbothregularandirregulartextures.tocreatea"real"thre
7、e-dimensionaltexturewhichcanbeThecasestudieshaveshownthatthetexturescreatedaremachined.notonlygoodforavisualeffect,butarealsomachinable.Therearetwomaincategoriesoftexture-"macrotexture"ThedevelopmentworkisincorporatedintotheArtCAMsystemand"microtexture"[6]."Mac
8、rotexture"referstosurfaceprimi-whichisaspecialisedCAD~CAMsystemthatiscapableoftivesthataregovernedbyspecificplacementrules,whereasgeneratingthree-dimensionalshapesfromtwo-di
