chapter07 applied lighting techniques外语英文电子书

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1、P-0734703/13/0112:53AMPage299CHAPTERAppliedLighting7Techniques299P-0734703/13/0112:53AMPage3003003DLIGHTINGnthepreviouschapter,weexaminedbasiclightingsituationsandtheconceptofusingmultiplelightstodothejobofonetogetamorerealisticrendering.WealsofocusedonIthe

2、effectsofkeyordominantlightinasceneandfilllightswerediscussedinthelightarraytutorials,butadirectdiscussionofkeytofilllightinteractioniswarranted.Inthischap-terwewillexpandonthebasiclightingconceptsanddiscusskeytofilllightinteraction.MAIN/KEYLIGHTPATTERNSThe

3、keylightcouldbeplacedanywhereinthescene,butthereareseveralmajorkeylightpo-sitions.Eachofthesekeylightpositionshasitsownwayofrenderingtheobject.Theactualuseofaparticularkeypositiondependsonthelightingsituationaswellastheintendedpsy-chologicaleffect.Changingt

4、hepositionofthekeylightilluminatesthesubjectandalterstheviewer’sresponsetothesubject.Thelightingtechniquespresentedinthischapteraretheclassicpositionsofkeyandfilllightsasusedinportraitlighting(Figure7.1).Theselightingtechniquesareapplicabletoanysubjectthatb

5、enefitsemphasisanddefinitionthroughlighting.Theactual3DapplicationscenesforeachspecificlightingsetupareontheCD-ROMforLW5.6,tS4.3,andMAX3.1.FIGUREKeyfillandbacklightingcombined.7.1P-0734703/13/0112:53AMPage301CHAPTER7APPLIEDLIGHTINGTECHNIQUES301FRONTLIGHTING

6、Placingthekeylightnearthecameraorlensaxisresultsinfrontlighting(Figure7.2).Theac-tuallightplacementcanbeabithigherthanthecameraorofftotheside.Aflattenedformandcompressedshadowscharacterizefrontlighting.Sincethelightisevenlyilluminatingthesubjectandisnearthe

7、camera,thefeaturesofthesubjectareabstractedandmadetwo-dimensional.Frontlightingminimizesasubject’stextureandvolume.Thereisnolightmod-elingwithfrontlighting.FIGUREFrontlighting.7.2Frontlightingisveryunflattering,butcertainsubjects—namelytheelderlyandin-fants

8、—benefitfromitsflatlighting.Intheelderly,frontlightingminimizeswrinklesandenlivenstheskin.Forinfants,frontlightingmatchestheirrelativelyflatface.Frontlightingisalsoidealforthin-facedsubjectsbecauseitma