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面向神威太湖之光的并行光路追踪绘制引擎的实现.docx

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面向神威太湖之光的并行光路追踪绘制引擎的实现 Title：ImplementationofParallelRayTracingEngineforShenWeiTaihuLight Abstract： Inrecentyears,thedemandforhigh-qualitycomputergraphicshasbeenincreasingrapidlyinvariousfields,suchasvirtualreality,gaming,andmovieproduction.Raytracing,afundamentaltechniqueincomputergraphics,hasgainedsignificantattentionduetoitsabilitytoproducerealisticimagesbysimulatingtheinteractionsoflightrayswithobjectsinascene.However,raytracingiscomputationallyexpensive,anditsexecutiontimecanbesignificantlyreducedbyparallelcomputingtechniques.Inthispaper,wepresenttheimplementationofaparallelraytracingenginefortheShenWeiTaihuLightsupercomputer,whichisknownforitshigh-performancecomputingcapabilities.Wediscussthedesignprinciples,dataparallelism,loadbalancing,andoptimizationsusedinourimplementation,andevaluateitsperformancebycomparingitwithasequentialraytracingengine. 1.Introduction： Computergraphicsplaysavitalroleinvariousdomains,includingentertainment,scientificvisualization,andarchitecturaldesign.Thegoalofcomputergraphicsistogeneraterealisticandvisuallyappealingimagesthatcanbeindistinguishablefromrealobjects.Raytracingisarenderingtechniquethatsimulatesthebehavioroflightinteractingwithobjectstoproducephoto-realisticimages.However,raytracingisacomputationallyintensivetask,asitinvolvestracingraysthroughasceneandcalculatingtheintersectionswithobjects.Toovercometheperformancelimitationsofsequentialraytracing,parallelcomputingtechniquescanbeleveraged,makinguseofthehigh-performancecomputingcapabilitiesoftheShenWeiTaihuLightsupercomputer. 2.Background： Tounderstandtheimplementationofaparallelraytracingengine,itisnecessarytohaveasolidunderstandingofthebasicprinciplesbehindraytracing.Inraytracing,avirtualcameraisplacedina3Dscene,andraysarecastfromthecamera'sviewpointthrougheachpixeloftheimageplane.Theseraystraversethesceneandinteractwithobjects,suchasgeometryandmaterials,tocalculatethecolorandintensityforeachpixel.Traditionalraytracingtechniquesinvolveadepth-firsttraversalofascene'shierar