TheMaterialitemisthedefaultgeneralpurposeShaderTreelayerthatcontrolsallthestandardshadingattributesforasurface'sfinalrenderedlook.TheMaterialitemcontainschannelstocontrolDiffuse,Specular,Reflections,andTransparency,amongothersurfacingattributes.
Bydefault,everynewscenecontainsasinglemateriallayercalledtheBaseMaterialthateffectivelyshadestheentiresceneuntilmaterialtagsaredefined,limitingmaterialsandshadingtospecificsurfaces.
Thefollowingprocedureappliesamaterialtoaselectedmeshitem,creatingamaterialtag.
ThePolygonSetMaterialdialogdisplays.
MakeDefault-Setsasthedefaultmaterialforallnewmaterials.
AddtoLibrary-SavesyourmaterialtotheShadertreeunderthe
TheMateriallayer'spropertyformisdividedintothreesub-tabs:
ShadingModel
PhysicallyBased-exhibitsthemostfaithfulhighlightshapeandFresnelfalloffshadingandisbasedontheGeneralizedTrowbridge-ReitzBRDFmodel,popularizedbyanumberoffamousmoviestudiosbecauseofitsabilitytoproducerealisticsurfaceshading.
Traditional-allowsyoutomatchsurfacestothoserenderedusingModo'slegacyBRDF,basedontheonthePhong-Blinnmodel.
Principled-allowsyoutousephysicallyprincipledBRDFproperties.
DiffuseAmount
Intherealworld,allsurfacesabsorbcertainwavelengthsoflightwhilereflectingothers.Thelightthatisreflectediswhatweperceiveasthecoloroftheobject.Thisisknownasdiffuselight.TheDiffuseAmountattributeactsasamultipliertotheDiffuseColorsettingdetermininghowmuchofthatlightisreflectedfrom,orabsorbedby,thesurface.
Asettingof100%returnsthesamevaluedefinedastheDiffuseColorvaluewhenlitbyapurewhitelightat100%intensity.
ADiffuseAmountof50%appearshalfasbrightunderthesamelightasitwouldonlyreturninghalfofthelightbouncedfromthesurface.
Allsurfaces,nomatterhowshinyabsorbatleastasmallamountoflight,sothedefaultvalueisdefinedas80%.
DiffuseColor
Thissettingdefinesthecolorofthesurfacewhenlitbyapurewhitelightsource,multipliedbytheDiffuseAmount.Thisattributeiseffectivelythecolorofyourobject,representingthelightthatbouncesfromthesurface.DiffusecolorscanalsobedrivenbeyondtraditionalcolorspaceintohighdynamicrangevaluesbyapplyingDiffuseAmountsover100%,buttheywillnotbephysicallyplausibleatthatpoint.
DiffuseRoughness
Extremelymattesurfaces,suchasstone,concrete,orplaster,reflectlightverydifferentlythansmoothorglossysurfaces,suchasglassorplastic.Thisisbecause,onamicroscopiclevel,themattesurfaceisactuallyquiterough,spreadingthelightoutwardsmakingthesurfaceappearmoreflat.
DiffuseRoughnessaimstosimulatethismicroscopicroughnesseffectbymodifyingthestandardshadingmodel,producingamorebelievablemattesurface.Avalueof0%disablestheeffect,whilevaluesabovezeroincreasinglyproducearougher,moremattesurface.SinceDiffuseRoughnesssimulatesalackofSpecular,itisbestappliedwhentheSpecularAmountis0%(seeimageexamplesbelow).
GLOverride
UseRefractiveIndex
Whenenabled,usethedefinedRefractiveIndexvaluetosetthespecular/reflectivityamountforasurface.ThemainbenefitbeingthattheRefractiveIndexisacommonlymeasuredvaluepostedinseveralonlinedatabasesusedtodefinethephysicalaccuracyofsurfaces.
SpecularAmount
Intherealworldspecularhighlightsarethereflectionsofverybrightlightsourcesonasurface.Howthesereflectionsspreadoverasurfacetellsyoualotaboutthatsurface,whetheritisshinyordull,smoothorrough.Modosimulatesthisreflectionwiththesefivesettings:
Generatedonlyfromdirectlightsources,theSpecularAmountismultipliedwiththeSpecularColortocreatetheoverallrenderedresult.Increasingthevalueresultsinamoreintensehighlightwhiledecreasingthevaluemutestheeffect.Whenthisvalueis0%,theSpecularColor,Roughness,andAnisotropycontrolsaredisabledandspecularityisnotcalculated.
Fresnel
Atglancingangles(anysurfacethatisnearperpendiculartothedirectionthecameraisfacing)manytypesofsurfacesincreasetheirreflectancevalues.TheFresnelsettingincreasesthespecularamountattheseglancinganglestoproduceaphysicallyplausibleresult.
SpecularColor
DefinesanRGBvaluethattintsthespecularhighlight.
Roughness
Surfacescanbeverydifferentfromeachother,suchasarubberball,aplasticcup,andaterracottabrick.Theseareallseeminglysmoothsurfaces,butonamicroscopicscaletheirsurfacesareverydifferent.Themicroscopicsurfacevariationshasadirecteffectonthewaythelightreflectsoffofeachsurface.
Anisotropy
Millionsofmicroscopicscratchesonasurfacedistorthighlightsandreflectionsovertheirsurfaceparalleltothedirectionsofthescratches.TheAnisotropyvalueaffectsthehighlights,simulatingthiseffect.
AnisotropyiscontrolledbyaUVmaporfurthercontrolledbyatexturemapswhenthelayerseffectissettotheAnisotropyDirection.Itcanbecausedbymanyman-madeprocesses,suchasmachiningmetalandalsoappearsintextileswhereshinythreadsspreadthehighlightoverasurface.
AnisotropyMap
TheUVmapdropdownallowsyoutochoosewhichmapdeterminestheanisotropicdirection.TheUdirection(horizontal)definesthedirectionofthevirtualscratchesforpositiveAnisotropyvalues.
ReflectionType
AllowsyoutochoosebetweenFullScenereflectionevaluationorEnvironmentOnly.Thissettingeffectivelyswitchesbetweenraytracedreflectionsandanenvironmentmaptechnique.Thefollowingoptionsareavailable:
FullScene-Moreaccurateattheexpenseofgreaterrendertimes.
ClearcoatAmount
SettingClearcoatAmountto0%effectivelyturnsthefunctionoff,increasingvaluesaddthereflectiveeffect.Werecommendthat,inmostcases,you'lljustwanttoleavethissettingat100%.
ClearcoatRoughness
BlursthereflectionshadingaddedbyClearcoat,workingthesameasthenormalRoughnesssetting,butspecifictojusttheClearcoatAmountforindependentcontrol.
ClearcoatBump
DefinesthedegreetheClearcoatshadingignoresforanybumpmappingthathasbeenappliedtothesurface.
BumpAmplitude
Bumpmapsareameansofcreatinghighfrequencydetailsonasurfacethatwouldbedifficult,ifnotimpossible,tomodel.Bumpmappingitselfisatechniquethatmodifiesaray'sdirectionwhenshadingasurface,givingtheillusionthatasurfacehasmoredetailthanitactuallydoes.
BumpAmplitude0mm
BumpAmplitude50mm
BumpAmplitude100mm
DisplacementDistance
SimilartoBumpmaps,Displacementisameanstoadddetailtoasurfacethatwouldbedifficult,ifnotimpossibletomodelotherwise.ThemapsthemselvescanbegeneratedinModousingthesculptingtoolset,orinanexternalapplicationsuchasZBrushorMudbox;evenproceduraltexturesareusefulasDisplacementsources.
TheDisplacementDistancesettingdeterminesthemaximumrangethatverticescanbecreated,ormovedaway,fromtheoriginalmeshsurfaceduringmicro-polygontessellation.Withavalueof2cm,novertexcanbedisplacedmorethan2cmawayfromtheoriginalsurface.Dependingonthemesh'sscale,thisvaluemayneedtobeincreasedsignificantly.
Whentexturesareappliedtothedisplacementchannel,shouldthecombinedtexturevaluebecomegreaterthan100%,theresultingsurfaceappearstobeclipped.
Themaximumdisplacementdistanceisdifferentfromothermaterialparametersbecausetherendererneedstoknowitwayinadvance,beforeanytexturesareevaluated.Atthestartofrendering,allsurfacesarejustemptyboundingboxes.
Theverticesandpolygonsofaparticularsurfaceareonlycreatedinthegeometrycachewhenaraypiercestheboundingboxofthesurface.
Fordisplacedsurfaces,theseboundingboxesmustbepaddedwiththemaximumdisplacementdistanceinordertoavoidholes,sincedisplacementcancausegeometrythatwouldnormallyappearinalaterbuckettoshowupinanearlierone.Forthisreason,theactualdistanceavertexmovescanneverexceedtheDisplacementDistance,thereforetexturevaluesoutsidetherangeof-100%to100%arealwaysclipped.
Smoothing
Ashadingtechniquegivingtheillusionthatgeometryhasmoredetailthanitactuallydoes.Withoutsmoothing,geometricfacescanappearfacetedorflat.TheSmoothingamountissetasapercentage,ratherthanasimpletoggle,sothatyouhavetheflexibilitytofadeinthesmoothingamount,orevendriveitabove100%orbelow0%tocreateinterestingeffects.
SmoothingAngle
Determineswhichfacesshouldreceivesmoothing.TheSmoothingAnglesetsamaximumangletolerancebetweentwopolygonsbasedontheirnormals.Iftheanglebetweenthepolygonsisgreaterthanthesmoothingangle,nosmoothingoccurs.Thisisusefulsothathardedges,suchascubes,arenotsmoothedacross.Thedefaultvalueof40°isagoodgeneralcasevalue.
DoubleSided
Whenenabled,shadingoccursfrombothsidesofapolygonregardlessofthenormaldirection.Bydefault,thiscontrolisdisabledsothatpolygonsthatdonotfacethecameraseeminvisible,astheyonlyhaveoneside.
NormalMethod
Specifieshowtogeneratethegeometricfacenormals.
Default-Derivethenormalfromthefirstthreeverticesofthepolygon.
Newells-Calculatesanicergeometricnormal.Moreexpensivetocomputebutcanlookbetterfornon-planarpolygons.
WeightbyPolygonArea
SumCoplanarPolygonAreas
Addsuptheeffectiveareasofcontiguouscoplanarpolygons.Effectivelypretendingthatconnectedpolygonswhicharemorearelessflatareonelargepolygonwhencalculatingtheirarea.
WeightbyPolygonAngle
CreasebySmoothingAngle
Togglescreasingtheshadingofthemeshbythematerial'ssmoothingangle.Disablingthisoptionhasasimilareffecttosettingthematerialangleto180degrees.
SmoothingGroups
Selectshowtodealwithsmoothinggroups.
Off-IgnoresSmoothingGroupsentirely.
Crease-Smoothingissplitbetweenpolygonswhichdon'tshareanysmoothinggroups.Thisisthedefault.
Force-Smoothingissplitbetweenpolygonswhichdon'tshareanysmoothinggroupsandsmoothingisblendedbetweenpolygonswithmatchingsmoothinggroups,overridinganycreasingthatmaycomefromthesmoothingangle.
CreasebyHardEdges
Togglessplittingthesmoothingofthemeshbyanyhardedges.Disablingitignoreshardedgesentirely.
RoundedEdgeWidth
Adjuststherenderedresultofsurfacenormalsatapolygon'sedgetoblendthemwithadjoiningpolygonnormals,givingtheimpressionofasmallroundededgebetweenthetwointersectingfaces.Thewidthsofroundededgescanbecontrolledbyimagemaps,proceduraltextures,orgradients.Thevalueofatextureusingthiseffect,actsasamultiplierontheedgewidthspecifiedinthematerialproperties.
Youcandefinethewidthtodeterminetheamount,orroundness,butkeepinminditismerelyashadingtrickandwon'troundtheedgesoftheactualgeometry,norchangetheobject'ssilhouetteintherenderedimage.Generally,itisbesttosetthewidthtojustafewpixelsinthefinalrenderedimage.
EdgeWidth0mm
EdgeWidth2mm
EdgeWidth4mm
RoundedEdgeAngle
Controlswhichedgesshouldappearroundedbasedonhowsharptheyare.Specifically,anedgewillappearroundedifthesurfacenormalsoftheadjoiningpolygonsvarybymorethantheRoundedEdgeAnglesetting.Thedefaultvalueis40degrees.Loweringthesettingtozerodegreescausesalledgestoappearrounded.
RoundSameSurfaceOnly
Whenenabled,edgeroundingisconstrainedtothesurfacewithinthesameitemlayer.Whendisabled,roundededgesareappliedtothesurfaceregardlessofitemlayer.
Enable
Togglestheeffectofthelayeronandoff,duplicatingthefunctionalityoftogglingvisibilityintheShaderTree.Whendisabled,thelayerhasnoeffectontheshadingofthescene.However,disabledlayersaresavedwiththesceneandarepersistentacrossModosessions.
Invert
InvertstheRGBvaluesforthelayerproducinganegativeeffect.
GLDisplay
BlendMode
Opacity
Changesthetransparencyofthecurrentlayer.ReducingthisvalueincreasinglyrevealslowerlayersintheShaderTreeifpresent,ordimstheeffectofthelayeritselfonthesurface.
TransparencyAmount
Controlshowtransparentoropaqueasurfaceis.0%iscompletelyopaqueanddisablesthesettingaltogether,settingsabove0%graduallyincreasehowtransparentthesurfaceisrampingtoward100%,whichiscompletelytransparent.
TransparencyColor
Thetintcolorofarayasitpenetratesthetransparentsurface.Sincemanytransparentmaterials,suchasglass,shouldhavenodiffuseamountwhatsoever,thetransparentcolorisusedfortintingthematerial.
Atthedefault,purewhite,amaterialthatis100%transparentbecomescompletelyinvisibleunlesstherearereflectionsand/orspecularhighlights.Bychangingthetransparencycolor,thematerialbecomesvisibleasModosimplytintswhateverthecameraseesbehindthesurface.
AbsorptionDistance
Coloredtransparentsurfacesdon'toftenexhibitevencoloration.Thinareasappearcolorlesswhilethickerareasaretintedwithcolor.TheAbsorptionDistancecontrolsthiseffect,determininghowfararaymusttraveltoget100%oftheTransparencyColor.ThefalloffisdeterminedbyBeer'sLaw,justasintherealworld.
TherearetwoAbsorptionDistancemodes:
SettingtheAbsorptionDistancetovaluesgreaterthan0determinesfalloffusingBeer'sLaw.
SettingtheAbsorptionDistancetoexactly0forcestransmittedlighttoinstantlytakesonthetransparencycolorratherthanfollowingBeer'sLaw.
RefractiveIndex
Determineshowfaralightrayisbentwhenittravelsthroughamaterialand,whenUseRefractiveIndexisenabled,theindexdeterminestheamountofsurfacespecularityandreflectivity.Thehigherthevaluethemoredistortedtherefractive/reflectiveitemsbecome.
Forexample,avalueof1.0isequivalenttolighttravelingthroughavacuumanddoesnotbendtheraysatall.Increasingthevalueto1.333approximatestheamountofdistortionthatoccurswhenlighttravelsthroughwater.
Dispersion
DispersionisthedifferenceofRefractiveIndexbetweenvariouswavelengthsoflights.Purewhitelightintherealworldcontainsallcolorsofthespectrumasitpassesthroughsolidobjects,andtherefractionofdifferentwavelengthsvariescreatingarainboweffect.You'velikelywitnessedthiswhenshiningabrightlightthroughaprism.Thiseffectingemstonesisusuallyreferredtoas'fire'.
RefractionRoughness
Sometransparentsurfacesarebetterdescribedastranslucentorcloudy.Lightpassesthroughthesurface,butisdiffusedinsuchawayastomakeopposingitemsblurryorevencompletelyindistinguishable.Frostedglassexhibitsthiseffect,itemsclosetothesurfaceareclear,butastheyrecedefromview,edgesanddetailssoftenincreasingly.
SubsurfaceAmount
Subsurfacescatteringcontributestothediffuseshadingofmaterials.TheSubsurfaceAmountisapercentagevaluethatdeterminesthecontributionofdiffuseshadingmadebysubsurfacescattering.Itisagoodideatokeepthisinmindinordertobalancethepercentagesbetweendiffusecolorandsubsurfaceamountdependingonwhicheffectyoupreferforfinalshading.
SubsurfaceColor
Thecolorvaluethatisusedtotintthelightasitisattenuatedthroughthematerial.ThissettingandtheScatteringDistanceworktogethertodeterminehowfarthelightmusttraveltobetinted.
ScatteringDistance
Determineshowfarlightmusttravelthroughthesurfacepriortoexitinginordertobefullytintedbythesubsurfacecolor.Ifthelighttravelsbeyondthescatteringdistanceitisfurtherattenuatedaccordingtotheoriginalsubsurfacecolor.
Therearetwoscatteringmodes:
SettingtheScatteringDistancetovaluesgreaterthan0producesadiffusion-styleeffect.
SettingtheScatteringDistancetoexactly0producesasimpletranslucency,likediffusebutwithanoppositesurfacenormal.
MaximumDepth
Providesisafastwaytoapproximateanopaquesolidcorewithinthesubsurfacelayer(suchasaboneinsideafinger)byclippinganyscatteringsamplesthatreachbeyondMaximumDepthvaluespecified.Thismayleadtoaslightlydarkerscatteringbecauseoftheclippedsamplesexclusionfromthesolution,butanincreaseinthenumberoftotalsamplescanhelptoreduceoreliminatethiseffect.Asettingofzerodisabledtheoption.
FrontWeighting
SetsabiasfortheSSSrays.At50%,SSSraysscatterevenlyforwardandbackwardthoughasurface.Highervaluesbiasthescatteredraystowardthelightsourcethatemittedthem,creatingamorewaxy/flatlooktoSSS.Valueslowerthan50%biasthescatteredraysawayfromthelightsource,darkeningtheoverallSSSeffect.
SameSurfaceOnly
Whenenabled,Modo'ssubsurfacescatteringworksbylimitingtheSSSsamplecachevaluestoaffecttheshadingtoasinglesurface.Thispreventscertainartifactsthatoccurwithverythinsurfacesorintersectionswithnon-SSSsurfaces.
ThisoptimizationcanstopadjoiningSSSsurfacesfromsharingvalues,resultinginaslightdarkborderbetweenthem.Ifthisoccurs,disableSameSurfaceOnly.
LuminousIntensity
AmultiplierthatdrivesthebrightnessoftheLuminousColorasitisemittedfromthesurface.ThisisdifferentfromtheDiffuseAmountinthatdiffuserequiressomeamountoflighttohitthesurface,whereasluminouscomesfromthesurfaceitself.
Itisaccuratetothinkofluminoussurfacesaslightsources-particularlywhenusingGlobalIllumination.TheLuminousIntensityismultipliedtotheLuminousColor.Bydefault,thevalueiszerowhichresultsintheLuminousColorcontrolbeingdisabled.
LuminousColor
ThissettingallowsyoutospecifyacolorvalueforlightemittedfromasurfaceasspecifiedbytheLuminousIntensitysetting.
Importanceisanestimateofhowmuchaparticularshadingevaluationcontributestothefinalcolorofapixel.Forsurfacesdirectlyviewedbythecamera,it'sbasicallywhatfractionofapixeltheshadingevaluationrepresents,whichdependsonhowmanyantialiasingsamplesarebeingshadedtogetheraspartofasingleevaluationversusthetotalnumberofantialiasingsamplesinthepixel.
Ifthereare8AAsamplesinapixelandtheyareallshadedtogetherasagroup(whichcanhappeniftheyallbelongtothesamesurfaceandtheShadingRateislarge),thatsingleshadingevaluationentirelydeterminesthepixelcolorandthushasanimportanceof100%.Attheotherextreme,ifeachantialiasingsampleisshadedseparately(whichcanhappeniftheShadingRateissmallorzero),theneachofthe8shadingevaluationshaveanimportanceof1/8or12.5%.Thisimportancevalueisusedtomodulatethenumberofraysusedtocomputevariousphenomena,suchassoftshadows,MonteCarloindirectillumination,blurryreflections,andsimilar.At100%importance,thefullnumberofraysspecifiedareused.Forexample,ifthereare64blurryreflectionraysspecifiedinamaterial'sproperties,then64raysarefiredduringtheshadingevaluation,butinashadingevaluationwith12.5%importance,onlyeightreflectionrays(12.5%of64)arefired.
TheImportancesettingimposesalimitonimportancewhenshadingsurfacesaredirectlyviewedbythecamera.Thiscancausemoreraystobeusedinsomecases,reducingartifactsthatcanbecausedbyClampColors,butcanalsopossiblyincreaserendertime.
ExitColor
Originally,whenaseriesofrefractionrayshitthemaximumrefractiondepth,Modoreturnedblackasthefinalvalue,sosceneswithlowrefractiondepthvaluesexhibitedlotsofdarkareas.
ExitColorallowsyoutospecifythecolorModoreturnsonceithasreacheditsraythreshold.Thecolorisstillattenuatedwiththeinitialraybounces(colors,absorption,andsoon),however,thissettingcanreducealotofthedarkareaspresentwithlowerrefractiondepthvalues.
Inthefirstexamplebelow,thereisagoodamountofblackrevealedbecauseofthelowrefractiondepth.Inthesecondimage,theexitcolorischangedtoamediumgray,simulatingthebackgroundcolor,whichresultsinamoreaccuraterepresentation.Finally,thelastimagechangestheexitcolortoredmakingtheeffectsoftheExitColorsettingobvious.
UseVertexIrradianceCache
EnableSurfaceClipping
InorderforSurfaceClippingtowork,itmustfirstbeenabledintheCameraitem,undertheClippingattributes.Youcandefinethedistancevalueaswell,determiningthedistanceawayfromthecamerawherethesceneclipstherenderedimage.Youcandisabletheclippingeffectonaper-materialbasisbydisablingthisoption.
MatteClipping
Providesameanstocolorizeinteriorareasofclippedgeometryproducingafilledareaofcolor,thecolorbeingdeterminedbytheMatteColorvalue.
MatteColor
DeterminesthecolorofclippedinteriorareaswhenClippingisenabledinboththeMaterialclippingattributesandintheCameraitem.
Definesadistancewhereall(orselected)surfacesareclipped,removingthemfromtherenderedimagewhileleavingthescenegeometryintact.
Whenlightshinesoncertainmattersuspendedintheair,suchaswatervapor,smoke,dust,orevenpollution,theparticlesbecomevisible.Thisisknownincomputergraphicsasavolumetriceffect.Twothingsthenhappentothelight:partofitisbouncedbackinalldirections(calledscattering)andpartofitisabsorbed(calledabsorption).
TheDensityparameteristheparticledensityofthevolume,sothehigherthedensitythemoreapparentparticlesthereare.WhentheDensityisincreased,thescatteringandtheabsorptionalsoincrease,soyourvolumebecomesbothmoreopaqueandmoreluminous.However,whenDensityisincreased,thevolumebecomesmoreopaqueandthelightscatteredinsideismoreattenuated,sothenetresultintermsofoverallluminosityishardtopredict.Thefinalresultdependsonthebalanceofscatteringversusabsorptionversusdensity.
Insimpletermsonecansaythatscatteringissimilartodiffuseshadingandabsorptionisinverselysimilartoluminosity(morelightreflectedbackmakesthevolumeappearluminous).Thisishowevermoresubtlethanthatsincetheoverallluminosityalsodependsonhowmuchabsorptionhappensinsidethevolume.
Thefollowingsettingsonlyapplytothevolumeitemandotherwisehavenoaffectonthesurface.Likewise,theothersurfacingattributes,suchasDiffuseColorandReflectionAmounthavenoaffectonavolumetricitem.Thevolumeitemalsocontainssimilaroptionsthatactasmultipliesofthevaluesbelow,allowingyousomeadditionaltweakingoptions.
ScatteringAmount
Scatteringdefinestheamountoflightthatisreflectedfromthevolume.Thiscanalsobedescribedashowluminousthevolumeis,whereacloudispuffyandwhite,itisbecauseitreflectsbackalotofthelightitreceives(alsoabsorbingverylittle).Conversely,adensesmokecloudfromanoilfirereflectsbackverylittlelight,lookingverydarkandominous.
Avalueof0%reflectsbacknolightreceivedfromthesource,uptoward100%(thedefaultvalue)wherethevolumereflectsbackallofthelightitreceives.
ScatteringColor
Representstheapparentcolorofthevolume;thelightthatisreflectedfromtheparticulatematter.
AbsorptionAmount
Determineshowmuchlightisabsorbedintotheparticularmatter.Iflowamountsoflightareabsorbed,thenmorelightisreflectedbackproducingabrighter,moreluminousvolume.Wheremorelightisabsorbed,thevolumeappearsdarker,morepowdery,anddustlike.
AbsorptionColor
Determinesthecolorthatisabsorbedintothevolume(whichproducesaninvertedhuetowhatisapplied).
LuminosityAmount
Whenappliedtoavolume,graduallyproducesanoverallconsistentcolorationtothevolumeasifitwereasourceofillumination.Avalueof100%colorstheentirevolumetheLuminosityColorvalue,flatteningouttheform,andeliminatinganydetails.
LuminosityColor
DeterminesthecolorationoftheLuminosityAmountaddedtothevolume.
Density
Determinesthethicknessofthevolume,controllingtheapparentamountofparticularmatterthatisvisible.
Whenlightgoesintoorthroughvolumetrics,forexamplefogorsmoke,lighttowardstheredendofthespectrummakesitthroughaloteasierthanothercolors,sothenon-redpartsofthelightgetsfilteredoutthedeeperintoavolumethelightgoes.Ratherthanmakelighttintautomatically,likeitdoesinnature,theRedShiftchannelletsyoucontrolhowmuchthishappens.
Thetopexamplehasa200%RedShiftappliedandthebottomexamplehasnoRedShiftapplied.Thearrowsinthisimageindicatethelightdirection.
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