[PCCGA-2002]An Efficient Brush Model for Physically-Based 3D.pdf

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1、AppearedinPacificGraphics2002AnEfficientBrushModelforPhysically-Based3DPaintingNelsonS.-H.ChuChiew-LanTaiDepartmentofComputerScienceHongKongUniversityofScienceandTechnologyClearwaterBay,Kowloon,HongKong{cpegnel,taicl}@ust.hkAbstractThispaperpresentsanovel3Dbrushmodelconsistingofaskeleton

2、andasurface,whichisdeformedthroughconstrainedenergyminimization.Themainadvantageofourmodeloverexistingonesisinitsabilitytomimicbrushflatteningandbristlespreadingduetobrushbendingandlateralfrictionexertedbythepapersurfaceduringthepaintingprocess.Theabilitytorecreatesuchdeformationsisessen

3、tialtorealistic3Ddigitalpaintingsimulations,especiallyinthecaseofChinesebrushpaintingandcalligraphy.Tofurtherincreaserealism,wealsomodeltheplasticityofwettedbrushesandtheresistanceexertedbyporesonthepapersurfaceontothebrushtip.Ourimplementationrunsonaconsumer-levelPCinreal-timeandproduce

4、sveryrealisticresults.Figure1:Calligraphymadewithoursystem1.Introductionachievablebecauseofthesoft-yet-resilientqualityofthebrushtuft.DigitalpaintinghasbeenadoptedbymanyartistsOuraimistosimulatethedeformationofChineseduetoitsadvantagesovertraditionalmediaintermsofbrushesandtheinkdepositi

5、onduringthepaintingconvenience,easeofexperimentation,andtheprocessinreal-time.Itisexpectedthatour3Dbrushpossibilityofcombiningtheeffectsofmultiplemodel,whencombinedwithanink-diffusionsimulationtraditionalmediainonedigitalpainting.Itisnowmethodandasixdegrees-of-freedom(DOF)inputpossibleto

6、achievetheeffectsofvariouswesterndevice,canbeatoolforcreatingdigitalChinesepaintingmedia(e.g.oilorcharcoal)realisticallyusingbrushwork.ThebenefitsofsuchatoolincludethecommercialpackageslikeCorelPainter[13].Incontrast,following:howevergooda2Dmark-makingtechniqueis,itcannot•Createelectroni

7、cartmorenaturallyandwithextendtheexpressivenessofChinesebrushestothespontaneity–userspaintanddrawwithavirtualdigitaldomain.InChinesebrushwork,apainteruseshisbrushratherthaneditcontrolpoints,allowingbrushinamannersimilartothewayamusicianuseshisindividualuserstyletobenatura