This document summarizes deferred rendering techniques used in the games Raiderz and Gunz2. It discusses using multiple passes with G-buffers to store normal, depth, diffuse, and specular information. It then shows how light and post effect passes can be used to composite the G-buffer data for shading and lighting. The document provides code examples and discusses techniques such as decals, screen space effects, and reconstructing position from depth for off-screen lighting.

1. Deferred Rendering
case study
: Raiderz & Gunz2

2. 선임연구원 오지현
ozlael.egloos.com
@ozlael

8. Depth / Diffuse /
G - pass Normal
Specular Mask
L - pass Light Buffer
Merge
Additive
M - pass
Opacity
Post Effect

9. Depth / Diffuse /
Normal
Specular Mask
Light Buffer
Merge
Geometry Pass
Additive
Opacity
Post Effect

10. Usage Format R G B A
Nromal R16FG16F Normal X Normal Y
Depth, R16FG16F Linear Specular.
Specular Depth Rim
Diffuse, R8G8B8A8 Diffuse R Diffuse G Diffuse B Mask
Mask

11. G-buffer Normal.XY
Normal.Z = sqrt(1 - Normal.X2 - Normal.Y2)
Code: KillZone2

12. on
irecti
Cam
era D -Z
+Z
Ground

13. G-buffer Linear Depth.X
Depth's sign = Normal Z's sign

14. G-buffer Depth.Y
3 values in 1 channel
Specular Glossiness : 1 ~ 100
[Sign] Integer . Fractional
Rim : 0,1 Specular Level : 0 ~ 0.99

15. G-buffer Diffuse.RGB
A : Mask

16. Decal

17. Screen Space Decal

19. vProjcoord = mul( vPos, mxViewToDecal)
Image : Effects Techniques Used in Uncharted 3, GDC12

20. G-buffer
Diffuse.A

22. Depth / Diffuse /
Normal
Specular Mask
Light Buffer
Merge
Light Pass
Additive
Opacity
Post Effect

24. Reconstructing Position from depth
G-D
epth
for Lighting

25. // Get the depth buffer value at this pixel.
float zOverW = tex2D(depthTexture, texCoord);
// H is the viewport position at this pixel in the range -1 to 1.
float4 H = float4(texCoord.x*2-1, (1-texCoord.y)*2-1,zOverW, 1);
// Transform by the view-projection inverse.
float4 D = mul(H, g_ViewProjectionInverseMatrix);
// Divide by w to get the world position.
float4 worldPos = D / D.w;
Image :killzone2 Code: GPU Gems3

26. vPos =
ray * depth;
(0 ~1)
epth
G-D
matt pettineo, dawn studio

28. float3 ray = FarTopRight;
ray.xy =
lerp(-FarTopRight.xy, FarTopRight.xy, scrUV);
float depth = tex2D(DepthBuffer, scrUV);
float3 PosInView = ray * depth;
http://blog.daum.net/rockeracer/38

29. o ol
nT
a tio
liz
isua
V

30. Directional Light

31. Directional Light
Sub Light
Sub Light
Sub Light

32. Grayscale Specular Level
(D+S)XL vs (DXL)+S

33. SSAO

34. 27ms
Geforce 8800GT
1920x1080
HBAO

35. 전체에 AO 적용
d ow
ha
ns
nlyi
O
그림자영역만 AO 적용

36. 케릭터에 AO 적용 for r
ot cte
N ra
c ha
케릭터에 AO 미적용

37. Normal Depth
Light Buffer
Diffuse
Merge
Additive
Opacity
Post Effect

38. Material Pass
Geometry Buffer
Light Buffer
Merge
Additive
Opacity
Post Effect

39. Before
+= After

40. SubSurface Scattering
표면하산란
http://www.mrbluesummers.com

41. 비싼 남자들

42. Fake SSS
Real-Time Approximations to
Subsurface Scattering,
- GPUGEMS
슈퍼 스트리트 파이터
그래픽스 강좌
- 니시가와젠지
마비노기 영웅전의
캐릭터 비주얼 시스템
- NDC08

43. +
Before After

44. Hair lighting
Hair Rendering and Shading
- Scheuermann, GDC 2004
RenderMonkey sample

46. +
Before After

47. Transparency

48. Light buffer

49. Geometry Buffer
Light Buffer
Merge
Additive
Opacity
Post Effect

50. Fast approXimate AA
http://timothylottes.blogspot.kr

51. 3D VISION with Deferred

52. Fundamentals of Stereoscopic Imaging - Bernard Mendibru

53. Automatic !

54. WRONG !

55. 양안 명시적 렌더
( Quad Buffer )

56. OK !

57. NVAPI
http://developer.nvidia.com/nvapi
http://www.nvidia.pl/docs/IO/40505/WP-05482-001_v01-final.pdf
http://ozlael.egloos.com/3767971

58. t.n et
a ie
w .m
w w

59. Thank you ~
Special Thanks to
MAIET Ent. 임직원 일동
Kasa 멤버 일동
게임개발포에버 필진 일동
팟캐스트 게임개발자랩소디
팟캐스트 POG
결혼추카 학현
결혼추카 주행
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