1992. Hqteam / 1 , 2 / Art Director Ndoors Technical Art
Director / / http://chulin28ho.egloos.com
http://chulin28ho.tistory.com/ / http://gamedevforever.com
(PBS) ?PBR
PBS (Physically Based Shader )
! ! !Shader !
PBS PBS .
1. Energy Conservation
?
, , . Diffuse : Specular :
11
.
12
13
, .
14
100% ,
(Specular) (Diffuse) .
100%
- PBR
2. Specular Color
http://spectrevision.net/2012/09/28/the-fake-gold-standard/https://www.flickr.com/photos/37921614@N00/7649146152
18
(Shared Electron)
http://www.gamedevforever.com/17
Diffuse Color + Specular Color
Diffuse Color + Specular Color
1- Diffuse Color = Specular Color
https://area.autodesk.com/tutorials/natascha_hybrid_texturing
PBS Metal
MetalDiffuseBRDF *0 , SpecularBRDF * Albedo
DiElectricDiffuseBRDF * Albedo , SpecularBRDF * 0.5
Albedo PBS
http://gizmodo.com/5163640/concordes-knobstastic-cockpit-looks-like-a-strategic-nuclear-bombershttp://www.arodate.com/
25
Metal Specular . DiElectric Specular . 26
PBS
! ! !Shader !
28
!>
!>
!>
Shader ! >
.
29
PBS
?
?
?
.
Valve Half Lambert . 36
Journey Technical Art
37
! !
38
NPR
(Non Photo Realistic) xrd-sign- 3d
39
!>
!>
!>
Shader ! >
40
!>
!>
!>
Shader ! >
41
PBR ?
43
PBR (Standard : Metallic pass)Diffuse + Specular + rim +
Reflection(BlinnPhong)
GGX44
?
GGX
45
PR (Photo Realistics) PBR !
46
PR (Photo Realistics) PBR !
PBR is NOT MAGIC!!!
!!!
50
AD ?
AD
Fortnite : : 2013
http://kotaku.com/5925515/fortnite-will-be-the-first-unreal-engine-4-game
http://blog.selfshadow.com/publications/s2013-shading-course/karis/s2013_pbs_epic_notes_v2.pdf53
Henry : ,
54
: !!!
PBS
PBS PBS
Shader
Roughness Smoothness Smoothness = 1- Roughness
56
(Non-PBS)
DiffuseAmbientSpecular (PBS)
BRDF DiffuseMetallicSmoothness (PBS)
BRDF DiffuseSpecular ColorSmoothness
struct SurfaceOutputStandard {fixed3 Albedo; fixed3 Normal;
fixed3 Emission; half Metallic;half Smoothness;half Occlusion;half
Alpha; };
struct SurfaceOutputStandardSpecular {fixed3 Albedo; fixed3
Specular; fixed3 Normal; fixed3 Emission; half Smoothness;half
Occlusion;half Alpha; };
Metallic PassSpecular Pass
MetalBlack * Diffuse BRDF , Albedo * Specular BRDF
Non-metalAlbedo * Diffuse BRDF , Gray* Specular BRDFAlbedo *
Diffuse BRDF , Specular Color * Specular BRDFMetallic PassSpecular
Pass
Metallic passBlack * Diffuse BRDF , Albedo * Specular BRDF
Specular pass Albedo * Diffuse BRDF , Specular Color * Specular
BRDFBlack * Diffuse BRDF , Specular Color * Specular BRDF
Non-metalAlbedo * Diffuse BRDF , Gray* Specular BRDFSpecular
pass Albedo * Diffuse BRDF , Specular Color * Specular BRDFAlbedo *
Diffuse BRDF , Gray * Specular BRDF
Specular pass Albedo * Diffuse BRDF , Specular Color * Specular
BRDF
PBR is NOT MAGICPBR . PBR ! PBR ,
PBR
()
PBS
Diffuse SpecularAmbient
AlbedoMetallic (Specular pass?)Glossiness
(Smoothness)Occlusion
?
,
1 : : // (//) : ?()
.
()
71
Diffuse
Ambient
Specular
Rim light / TranslucentFresnel ReflectionAmbient
OcclusionRefraction / Caustics
Specular Color
HDR LDR
PBS
2 :
Image from :
http://blog.digitaltutors.com/indirect-illumination-final-gather-vs-global-illumination/
83
PBR
NDC PBS
NDC
NDC !!!
3 : Shader Lambert / BlinnPhong / NPR
! ! !
PBR is NOT MAGIC ! PBR , PBR PBR , , !
http://www.gamedevforever.com/17
_https://www.unrealengine.com/ko/blog/physically-based-shading-in-ue4UE4
Jordan Walker[Ndc13]Ndc 2013 :UDK Physically Based Rendering for
ArtistsSand Rendering in Journey SIGGRAPH 2013 Course:Physically
Based Shading in Theory and
Practicehttp://blog.selfshadow.com/publications/s2013-shading-course/==Real
Shading in Unreal Engine 4 (Brian
Karis)http://www.slideshare.net/Hybrid0/physically-based-rendering-51309337http://bbs2.ruliweb.daum.net/gaia/do/ruliweb/default/ps/93/read?articleId=1454413&bbsId=G003NDC2015_3DS
MAX _16_9 xrd-sign- 3d
http://chulin28ho.tistory.com/ [email protected]@JPcorps
