Accelerating volume rendering with texture hulls (1)

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1、AcceleratingVolumeRenderingwithTextureHullsWeiLiandArieKaufman∗CenterforVisualComputing(CVC)andDepartmentofComputerScienceStateUniversityofNewYorkatStonyBrookStonyBrook,NY11794-4400AbstractTexture-mappinghardwarehasbeensuccessfullyexploitedforvol-umerender

2、ing.Inthispaper,weproposealgorithmsfortexture-basedvolumerenderingacceleratedbytexturehullsthatavoidthetransferringandcompositingofemptyvoxels.Wehavedevelopedmethodsthatefficientlyfindalltheboundingrectanglesofthenon-emptyregionsaswellastheboundingcontoursth

3、atmoreaccu-ratelydescribethebordersofthenon-emptyregions.Thebound-ingshapesaretreatedasthehullsofthenon-emptysub-textures.Texelsoutsidethehullsareskippedforstoringandrendering.Withouraccelerations,therenderingspeedis2to12timesfasterforavarietyofdatasets.Ke

4、ywords:Graphicshardware,2Dtexture-basedvolumerender-(a)lobsterdataset(b)sliceing,emptyspaceskipping,boundingshapes,texturehulls,contoursimplification.1IntroductionGeneral-purposetexture-mappinghardwarehasbeenusedindi-rectvolumerenderingforseveralyears[Weste

5、rmannandErtl1998;Meißneretal.1999;Rezk-Salamaetal.2000;Engeletal.2001].Withtheadvancesingraphicshardware,therenderingspeedhasdramaticallyincreasedaswellasvariousfeaturesthatimproveim-agequality,suchaslightingandtrilinearinterpolation,havebe-comeavailable.T

6、heprincipleoftexture-basedvolumerenderingistorepresentavolumeasastackofslices,eitherimage-alignedorvolume-aligned.(c)boundingrectangles(d)boundingcontoursTheslicesarethentreatedas2Dtextureimagesandmappedtoase-riesofpolygonsin3Dspace,hencethetexels(voxels)a

7、recompos-itedwithpixel-orientedoperationsavailableingraphicshardware.Forexample,torenderthelobsterdatasetshowninFigure1a,weneedastackofslicesextractedfromthevolume.Figure1bshowsoneofsuchslice.Ingeneraltexture-basedvolumerendering,eachsliceisloadedinfulland

8、allthetexelsfallingintotheviewfrustumarerendered.Typically,avolumetricdatasethasasignificantamountofvox-elswithzerovalues.Inaddition,formanystudies,somepartsofthevolumeareremovedtorevealotherpartsorofnointeres