Shadow Mapping and Shadow Volumes Recent Developments in Real-Time Shadow Rendering

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1、ShadowMappingandShadowVolumes:RecentDevelopmentsinReal-TimeShadowRenderingUniversityofBritishColumbiaCS514AdvancedComputerGraphics:ImageBasedRenderingInstructor:WolfgangHeidrichProjectReportAndrewV.Nealen∗TechnischeUniversitatDarmstadt¨AbstractInrecentyears,both

2、Williams’originalZ-buffershadowmap-pingalgorithm[Williams1978]andCrow’sshadowvolumes[Crow1977]haveseenmanyvariations,additionsandenhancements,greatlyincreasingthevisualqualityandefficiencyofrenderingsusingthesetechniques.Additionally,thefastevolutionofcom-modityg

3、raphicshardwareallowsforanearlycompletemappingofthesealgorithmstosuchdevices(dependingontheGPU’scapa-bilities)whichresultsinreal-timedisplayratesasseeninthereal-timeversionofPixar’sLuxoJrandtheuseofhardwareshadowmapstherein.Inthisprojectreportwedescribethemajorc

4、ontribu-tionssinceWilliams’andCrow’soriginalpublicationsin1978and1977respectively,brieflypresentboththeshadowmapping(whichiscomputedinimagespace)andtheshadowvolumealgorithms,presentmoresophisticatedapproachestoshadowmappingwhicharebettersuitedtohighqualityoff-lin

5、erenderersanddescribethealiasingproblemsinherentinallshadowalgorithmswhichoperateinimagespace(andproposedsolutions).Finally,wedescribenewextensionstotheexistingalgorithmssuchasperspectiveshadowFigure1:Shadowscreatedrama:ascreen-shotfromidsoftware’smapsasdescribe

6、dby[StammingerandDrettakis2002]inthe2002newestcreationDoom3.AgoodexampleusingstenciledshadowSIGGRAPHconference,androbuststenciledshadowvolumesbyvolumes.MarkKilgard[EverittandKilgard2002].uptheeffortsupto1990,includingmanyoff-linetechniquesnotKeywords:shadows,sha

7、dowmapping,algorithms,visualrealism,describedinthisreport.Duetotheageoftheirsurveythepa-graphicshardwareperfailstopresentthenewerdevelopmentsinthefieldsuchas(forshadowmapping):supportforhardwareacceleration[Kilgard1Overview2001][BrabecandSeidel2001],projectivetex

8、turemapping[Segaletal.1992][Heidrich1999],newersoftshadowmappingtechniquesTheimportanceofLanceWilliams’originalshadowalgorithm[BrabecandSeidel2002][Heidrichetal.2000]