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1、EurographicsSymposiumonRendering(2006)TomasAkenine-MöllerandWolfgangHeidrich(Editors)Real-timesoftshadowmappingbybackprojectionGaëlGuennebaud,LoïcBartheandMathiasPaulin†IRIT-CNRS-UniversitéPaulSabatier-Toulouse-FranceFigure1:Asceneincludingalpha-texturedmeshes(foliageandwirenetting).Left:ill
2、ustrationofrealisticsoftshadowsproducedbytheaverageof1024hardshadows(2.5sperframe).Right:ournewsoftshadowalgorithmrenderingthesamesceneat25fpswithoutanyprecomputation.AbstractWepresentanewreal-timesoftshadowalgorithmusingasingleshadowmapperlightsource.Therefore,ouralgorithmiswellsuitedtorend
3、erbothcomplexanddynamicscenes,andithandlesallrasterizablegeometries.Thekeyideaofourmethodistousetheshadowmapasasimpleanduniformdiscretizedrepresentionofthescene,thusallowingustogeneraterealisticsoftshadowsinmostcases.Inparticularitnaturallyhandlesoccluderfusion.Also,ouralgorithmdealswithrect
4、angularlightsourcesaswellastexturedlightsourceswithhighprecision,anditmapswelltoprogrammablegraphicshardware.CategoriesandSubjectDescriptors(accordingtoACMCCS):I.3.7[ComputerGraphics]:Three-DimensionalGraphicsandRealismColor,shading,shadowing,andtexture1.Introductionhowmuchthelightsourceisvi
5、siblefromtheshadedpoint,usuallyexpressedasapercentageofvisibility.Renderingrealisticsoftshadowsinreal-timeisafundamentalissueincomputergraphics.InadditiontoTargetingreal-timenon-dedicatedsoftshadowrenderingincreasetherealismofrenderedimages,theysimplifytheapplications,awellsuitedalgorithmsho
6、uldexhibittheidentificationofspatialrelationshipsbetweenobjects.Fromfollowingfeatures:thepracticalpointofview,pointlightsourcesgenerate1.handledynamicandcomplexscenesinreal-time,so-calledhardshadowswhereasharptransitionisseen2.beindependentofboththereceiver’sandtheoccluder’sbetweenlightandumb
7、ra.However,becausemostlightgeometry(suchasmeshes,pointclouds,images...),sourcesareextended(areaorvolume),theintensityofthe3.generateshadowsasfaithfulaspossibletorealones.lightsmoothlyvariesfromnoshadowtofullshadow,hencegeneratingsoftshadowswithregi
