02高级手册0501方向阴影细节

1、UnityManualAdvancedShadowsinUnityDirectionalShadow Directional Shadow Details 方向阴影细UnityManualAdvancedShadowsinUnityDirectionalShadow Directional Shadow Details 方向阴影细ThispageexplainsshadowsfromDirectionallightsindetail. Directionallightsaremostlyusedasakeylight-sunlightormoonlight-inaname.Viewingcan

2、behuge,llyandgames,andshadowsoftenrequiresometuningtogetthequalityvs.performancebalanceforyoursituation. 定向光源大多是用来作为主光源-阳光或月光-Letsstartoutgoodlookingshadowsetupfora让：Shadows here look pretty good! 阴影这里看来相当不错Here,visibledistanceisabout50gameunits,soShadowDistancewassetto50inQualitySettings.ShadowCasc

3、adeswassetto4ShadowResolutiontoHighandthelightusesSoftShadows. Chaptersbelowdissecteachaspectofdirectionallightshadows: HardversusSoftshadows ShadowCascadeShadowDistanceisImportant! Hard versus Soft shadows 硬阴影与HardversusSoftshadows ShadowCascadeShadowDistanceisImportant! Hard versus Soft shadows 硬阴

4、影与软阴Usingthesamelightsetup,ifweswitch ShadowTypetoHardShadows,thenthetransitionfromlitshadowedregionsishard-eithersomethingis100%inshadow,or100%lit.Hardshadowsarefasterrenderbutoftentheylooklessrealistic. Hardshadowswith distance of50 and four cascades. 50个硬4个级联距离ShadowCascadecount 阴影级联数ForDirection

5、allightsUnitycanusesocalledCascadedShadowMaps(alternativelycalledParallelShadowMaps)whichgiveverygoodshadowquality,llyforlongviewing.shadowsworkbydividingviewingoprogressivelyortionsandusingthesamesizeshadowoneach.Theresulttobjectsclosetotheviewergetmoreshadowmapnobjectsfar heimagesbelowwelluseHards

6、hadowsbecauseshadowpixelsareheimagesbelowwelluseHardshadowsbecauseshadowpixelsarebettervisiblethere. ，Ifnocascadedshadowmapswereused,theentireshadowdistance(still50unitsinourcase)mustbebytheshadowtextureuniformlyHardshadowswouldlooklikethiswithnocascades: 在Hardshadowswithdistanceof50andnocascades.50

7、距离的硬阴影而没有级联xelsoftheshadowtexturearethesamesizeeverywhere,andwhiletheylookgoodindistance,qualityisnots larupcloseTheshadowtexturecoverstheentireviewingareaandifvisualizeditwouldlook likethis: 阴影纹理像素的大小相同随处可见，而在距离里他们看起来良好，质量是没有星体的近距离。阴影纹With no cascades, shadow texture covers viewing area uniformly.

8、没With no cascades, shadow texture covers viewing area uniformly. 没有级联，阴影纹理平均Whentwoshadowcascadesareused,theentireshadowdistanceisoasmallerknearviewerandalargerkfaraway.HardshadowswouldlooklikethiswithtwoHardshadowswithdistanceof50andtwocascades.50的距离的硬阴影和两个级联Inexchangeforsomeperformancewegetbetters

9、hadowresolutionupclose. Withtwocascades,twoshadowtexturescoverWithtwocascades,twoshadowtexturescoverdifferentsizedportionsofviewing利用2 个级联，2 个阴影纹理覆盖不同大小视图区域的位Andfinallywhenfourshadowcascadesareused,theshadowdistanceisofourprogressivelyportions.Hardshadowswouldlooklikethiswithfour Hardshadowswithdist

10、anceof50andfourcascades.Hey,weveseenthis联50 距离的硬阴影和4 个With four cascades, four shadow textures cover different sized portions of viewing area. 利用4 个级联，四个阴ShadowDistanceisImportant! ShadowDistanceisextremelyimportantforbothqualityandperformanceWith four cascades, four shadow textures cover different

11、sized portions of viewing area. 利用4 个级联，四个阴ShadowDistanceisImportant! ShadowDistanceisextremelyimportantforbothqualityandperformanceofdirectionallightshadows.likeshadowcascadecount,shadowdistancecanbesetinQualitySettingsandallowsaneasywaytoshadowsdownonlessShadowsfadesituationsshadowsofshadowdistanc

12、e,andntobjectsarenotnsomehegamewouldnotbenoticeableanyway! Withnoshadowcascades,hardshadowsandshadowetto20unitsourshadowslookbelow.tshadowsdofadehedistance,thesametimeshadowqualityismuchitwaswithnocascadesandadistanceof50units. Hardshadowswithdistanceof20andnocascades.Hardshadowswithdistanceof20andn

13、ocascades.20Ifontheotherhandwesetshadowdistancetoohigh,shadowswontlookgoodatall.Settingdistancetohereonlydecreasesbothperformanceandqualityanddoesnotmakemuchsense-nohearenabout50meters Hardshadowswithdistanceof100andnocascades.Ouch! 100ShadowmapswithHardshadowswithdistanceof100andnocascades.Ouch! 100Shadowmapswithcascadesscalewithdistancemuchbetter.Forle,fourcascadesoftshadowscovering300unitsinfrontofthecameral