Real-time Terrain Rendering using Smooth Hardware Optimized Level of detail

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1、Real-timeTerrainRenderingusingSmoothHardwareOptimizedLevelofDetailBentDalgaardLarsenNielsJørgenChristensenTechnicalUniversityofDenmarkABSTRACTWepresentamethodforreal-timelevelofdetailreductionthatisabletodisplayhigh-complexitypolygonalsurfacedata.Aco

2、mpactandefcientregulargridrepresentationisused.Themethodisoptimizedformodern,low-endconsumer3Dgraphicscards.Weavoidsuddenchangesofthegeometry-alsoknownas'popping',whenreducingthegeometrybyexploitingthelow-levelhardwareprogrammabilityinordertomaintai

3、ninteractiveframerates.Terrainmodelsarerepolygonizedinordertominimizingthevisibleerror.Furthermore,themethodminimizesCPUusageduringrenderingandrequiresminimalpre-processing.Webelievethatthisisthersttimethatasmoothlevelofdetailhasbeenimplementedincom

4、modityhardware.Keywords:terrain,viewingalgorithms,frame-to-framecoherence,multiresolutionmodelling,continuouslevelofdetail1Introductionwithdifferentlevelofdetail(LOD)algorithmsandag-gressivefrustumculling.ThemainfocushasbeentoHeighteldterrainrenderi

5、ngandeditingisanimpor-minimizethetotalnumberofpolygonsdisplayedonthetantaspectofGIS,outdoorvirtualrealityapplicationsscreenatanypointintime.Famousmethodsforter-suchasightsimulatorsand3D-games.SuchscenesrainrenderingaretheROAMmethod[Duchaineau97]mayc

6、ontainthousandsofpolygonsandalthoughmod-andthelevelofdetailalgorithmintroducedbyLind-erngraphicscardsallowthedisplayofmanythousandsstrometal.atSIGGRAPH'96[Lindstrom96].Thisofpolygonsatreal-timeframerates,manyapplicationsmethodoperatesonaregularlyspac

7、edheight-mapandhavemodelswithgeometriccomplexitiesthat,byfar,mergestrianglesbasedonthevisibleerrorinscreen-exceedthereal-timecapabilities.Inthefuture,graphicsspace.ThemethodcleverlyavoidsT-meshesandcrackscardswillbeabletodisplaymoreandmorepolygonsint

8、hesurfacebypropagatingtrianglesplitsandmergespersecond,butontheotherhandthedemandforus-intheheight-map.In[Rottger98¨]themethodorigi-ingmorecomplexmodelswillalsorise,andthisgapnallydevelopedin[Lindstrom96]wasextendedwithabetweentheperformanceofgraphic