10-animation

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1、RecallOurApproachToAnimationWecreateanimatedbehaviorjustlikemovieprojectors•displayasequenceofstillimagesinrapidsuccessionAnimation•createstheillusionofcontinuousmotion•typicallywant30frames/sec,anddefinitelyhigherthan10Givensomeparameterizedgeometricmodel•foreveryf

2、rame,wecalculatethecorrectparametervalues•andwedrawthesceneinitscurrentstate•justneedtofigureouthowtospecify/controltheseparametersSomeOverallGoalsinAnimationTraditional(Manual)AnimationRealisticmotionEveryframecreatedindividuallybyahuman•aspecialcaseoftheoverallpho

3、torealismmotive•that’s24frames/secondattraditionalmoviespeeds•roughly130,000framesfora1.5hourmovieFlexibility&Expressiveness•wanttosupportthewidestpossiblerangeofanimationOvertime,ageneralprocessevolvedtosupportefficiency•systemthatcanonlyproduceasinglewalkingmotion

4、isboring•startwithsetofdrawingsoutliningclip—storyboard•seniorartistssketchimportantframes—keyframesEaseofcontrol–typicallyoccurwhenmotionchanges•somethingalmostimpossibletocontroldoesuslittlegood•lower-paidartistsdrawtherestoftheframes—in-betweens•alllinedrawingsar

5、epaintedoncels–generallycomposedinlayers,hencetheuseofacetate–backgroundchangesinfrequently,socanbereused•photographfinishedcel-stackontofilm1Computer-AssistedCelComputer-GeneratedAnimationAnimationCelanimationhasbeeninuseforalongtime(e.g.,atThisisthekindofanimation

6、we’rereallyinterestedinhereDisney)•startwithsome3-Dmodelofthescene•butwecanusecomputerstohelpexpeditetheprocess•varyparameterstogeneratedesiredposeforallobjects•drawsketcheswithdigitalsystems•renderscenetoproduceoneframe•usedigitalpaintprogramsforcoloring•repeatfora

7、ll130,000frames•caneventrytoautomaticallygeneratein-betweensSohowwillwecontroltheseparameters?Computer-assistedsystemsarenowquitecommon•manuallysetthemforeachframe•Disneymakesheavyofdigitaldrawing,painting,compositing•key-framing•2-Din-betweeningishardtogetright•gen

8、eratethemprocedurally•morphinga2-Dsketchdoesn’tgivetheimpressionof3-D•executebehavioralscripts(e.g.,followthefishinfrontofyou)•humansarest