PowerPoint

Unity Procedural Sky System

3ProgrammerEffect Artist! / Technical Artist 4

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Unity5 Procedural Sky Shader

5 sky shaderColor

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sky Color .Tint

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Unity5 Procedural Sky Shader

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Unity5 Procedural Sky Shader

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1 !!!!!!!!!!!!

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2 TERA - (2011)

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2 Alpha Blending() PBS Reflection Probe

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3Procedural Sky Shader

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Mie Scattering( ) .

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Shader Forge !

LightDir viewDirFresnel ! Fake Specular

, Light Color

Sky Color

Horizon ColorSky ColorTop Color

Horizon ColorSky ColorTop Color

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Horizon + Sky+ Top Horizon +Sky ColorTop Colorfloat3 Sunset3 = lerp(_SkyColor.rgb, _SunSetColor.rgb, normalizeWorldPostion.y);float3 SkyColor = lerp(Sunset3.rgb, _HorizonColor.rgb, pow((1.0 - max(0, dot(viewDirection, float3(0, -1, 0)))), 8.0));float3 FinalSkyColor = lerp(SkyColor, _SkyTopColor.rgb, max(0, dot(viewDirection, float3(0, -1, 0))));Sky Color

Horizon Color

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Color . -> Lerp ! Day ColorNight Color

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Color . -> Lerp ! Day ColorNight Color Day Colorsun90Lerp 1

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Color . -> Lerp ! Day ColorNight Color Night Colorsun-90Lerp 0

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Directional Light .

= = _WorldSpaceLightPos0 x,y,z _WorldSpaceLightPos0 x,y,z , Lerp 0~1 ?

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.. X,Y,Z ..

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.. X,Y,Z ..

_WorldSpaceLightPos0.x -> Rotation Y

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.. X,Y,Z .. _WorldSpaceLightPos0.y -> Rotation x

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.. X,Y,Z .. _WorldSpaceLightPos0.y -> Rotation x

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float3 emissive = lerp(DayColor.rgb, NightColor.rgb,_WorldSpaceLightPos0.y);

-90 night Color .. Night Colorsun-90Lerp 0

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float3 emissive = lerp(FinalSkyColor.rgb, FinalSkyColor2.rgb,_WorldSpaceLightPos0.y);

-90 ..,_WorldSpaceLightPos0.y 0 ! 1~-1

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- _WorldSpaceLightPos0.Y *0.5+0.5 !!

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Horizon ColorSky Color Horizon + Sky+ Top Horizon +Sky ColorTop Color

Sunset color Lerp float3 Sunset = lerp(_SunSetColor.rgb, _SkyColor.rgb, saturate(dot(float3(0,1,0),_WorldSpaceLightPos0.xyz)));

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Sky Color

Sunset colorfloat3 Sunset = lerp(_SunSetColor.rgb, _SkyColor.rgb, saturate(dot(float3(0,1,0),_WorldSpaceLightPos0.xyz)));

SkyColorsun90Lerp 1 0 1

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float3 Sunset = lerp(_SunSetColor.rgb, _SkyColor.rgb, saturate(dot(float3(0,1,0),_WorldSpaceLightPos0.xyz))); SunsetColorsun0Lerp 0Sky Color

Sunset color

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?UV !

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Vertex .

uv

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UV ..

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UV ..

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i.uv.y= i.uv.y*0.5 + 0.5;i.uv.x = (PI+atan2(i.posWorld.x ,i.posWorld.z)) /(2*PI);

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Layer3Layer2 Layer1 Layer0

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Layer3Layer2 Layer1 Layer0

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Layer3Layer2 Layer1 Layer0

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Layer3Layer2 Layer1 Layer0

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Procedural Sky

Reflection Probe Unity PBR

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- Reflection Probe

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Tint ( )

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Draw call 1

Lerp 4 #ifdef

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Thank you

Sky Color http://www.gamedevforever.com/85 : http://www.cyberschool.co.kr/gh/gh14.htm https://ko.wikipedia.org/wiki http://tip.daum.net/question/48470138Tera Rendering Techniques http://www.slideshare.net/valhashi/2011-03-gametechtadptforpdf

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