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SSAO
(Screen Space Ambient Occlusion)


                       2012.12.08
                       Devrookie
                         ์— ์—์Šค๋ฐ•
โ€ข   Ambient Occlusion(AO)
โ€ข   SSAO
โ€ข   ๊นŠ์ด ๋ฒ„ํผ SSAO
โ€ข   ๋ทฐ ์ŠคํŽ˜์ด์Šค ๋…ธ๋ง, ๊นŠ์ด SSAO
Ambient Occlusion
GI๋ฅผ ์œ„ํ•ด์„œ ๊ณ ๋ คํ•˜๋Š” ๋ถ€๋ถ„์ค‘ ํ•˜๋‚˜๋กœ Ambient
๊ฐ’์— ๊ด€๋ จ๋œ ๋ถ€๋ถ„์ด๋‹ค.

๊ธฐ๋ณธ ์กฐ๋ช… ๋ชจ๋ธ ์ค‘ Diffuse + Specular ์œ„์ฃผ์˜
๊ณ„์‚ฐ์„ ํ•˜๊ณ  Ambient๋Š” ์ƒ์ˆ˜๋กœ ์ง€์ •ํ•˜๋Š”๋ฐ ์ด
๋ฒˆ ์Šคํ„ฐ๋””์—์„œ๋Š” Ambient ๊ณ„์‚ฐ์— ๋Œ€ํ•œ ๋‚ด์šฉ์„
๋‹ค๋ฃฌ๋‹ค.
Ambient Occlusion
๋ฌผ์ฒด์˜ ๊ตฌ์„์ง„ ๊ณณ์ด๋‚˜ ์ฃผ๋ฆ„์ง„ ๊ณณ๋“ฑ ํŠน์ • ๋ถ€๋ถ„์—
๋Š” ๋น›์ด ์ƒ๋Œ€์ ์œผ๋กœ ๊ฐ€๋ ค์ง€๊ฑฐ๋‚˜ ์ž˜ ๋ฐ›์ง€ ๋ชปํ•˜๊ธฐ
๋•Œ๋ฌธ์— ๋‹ค๋ฅธ ๋ถ€๋ถ„๋ณด๋‹ค ์–ด๋‘ก๋‹ค.

์ฆ‰, ๋น›์ด ์ฐจํ๋œ ์ •๋„๋ฅผ ๊ณ„์‚ฐํ•œ ๊ฒƒ์ด๋ผ๊ณ  ๋ณด๋ฉด
๋œ๋‹ค.
Ambient Occlusion




AO(Global)   Diffuse(Local)   Combined
Ambient Occlusion
Ambient Occlusion
Ambient Occlusion
Ambient Occlusion
ํŠน์ • ์ ์„ ๊ธฐ์ค€์œผ๋กœ ๊ตฌ๋ฅผ ๊ทธ๋ ค ํ•œ๋ฒˆ์”ฉ ๊ฐ€๋ด์„œ
๋‹ค๋ฅธ ์ ์ด ๋‚˜์˜จ๋‹ค๋ฉด ๊ทธ ์ ์— ๋Œ€ํ•ด์„œ ์ฐจํ๋œ ๊ฒƒ
์ด๋‹ค.

๊ตฌ ์ „์ฒด์— ์ ์šฉํ•˜๋ฉด ์ •ํ™•ํ•˜๊ฒŒ ์–ผ๋งˆ๋งŒํผ ์ฐจํ๋˜
์—ˆ๋Š”์ง€ ๊ตฌํ•  ์ˆ˜ ์žˆ๋‹ค.
Ambient Occlusion




 (b)๊ฐ€ (a)๋ณด๋‹ค ์–ด๋‘์šธ ๊ฒƒ์ด๋‹ค!
Ambient Occlusion




๊ณ„์‚ฐ์€ P์—์„œ ๋ถ€ํ„ฐ ์ฃผ๋ณ€์˜ ๊ฑฐ๋ฆฌ๋ฅผ ์ธก์ •ํ•œ๋‹ค.
Ambient Occlusion

ํ€„๋ฆฌํ‹ฐ vs ํผํฌ๋จผ์Šค
   ์ •ํ™•ํ•˜๊ฒŒ ๊ณ„์‚ฐํ•˜๋ฉด ํ•  ์ˆ˜๋ก

      ํ€„๋ฆฌํ‹ฐ๋Š” Up
     ํผํฌ๋จผ์Šค๋Š” Down
Ambient Occlusion
์‹ค์‹œ๊ฐ„ ๊ฒŒ์ž„์—๋Š” ์‚ฌ์šฉํ•˜๊ธฐ ํž˜๋“ค
๋‹ค.
์ด๋ก ์ƒ์€ ์•Œ์•˜์ง€๋งŒ ์ ์šฉํ•˜์ง€ ๋ชปํ•˜๊ณ  ์žˆ๋˜ ๊ฐ€์šด
๋ฐโ€ฆ

Crytek์„œ Screen Space์—์„œ ๊ณ„์‚ฐํ•˜๋Š” Ambient
Occlusion์„ Crysis์— ์ ์šฉํ•˜์˜€๋‹ค!!
Ambient Occlusion




     ๋‘๋‘ฅ
โ€ข   Ambient Occlusion(AO)
โ€ข   SSAO
โ€ข   ๊นŠ์ด ๋ฒ„ํผ SSAO
โ€ข   ๋ทฐ ์ŠคํŽ˜์ด์Šค ๋…ธ๋ง, ๊นŠ์ด SSAO
SSAO
2007 SIGGRAPH conference์—์„œ
Martin Mittring์ด ๋ฐœํ‘œํ•œ
Finding Next Gen โ€“ CryEngine 2
์— ์†Œ๊ฐœ๋œ ๊ธฐ๋ฒ•
SSAO
Screen Space์—์„œ ๊ณ„์‚ฐ์„ ํ•˜๊ธฐ ๋•Œ๋ฌธ์— ํ™”๋ฉด์—
๋ณด์ด๋Š” ๋…€์„๋งŒ ์ฒ˜๋ฆฌํ•  ์ˆ˜ ์žˆ์–ด ๋น ๋ฅด๋‹ค.

ํ•˜์ง€๋งŒ ์ด ๋ฐฉ๋ฒ•๋„ ์ •ํ™•ํ• ์ˆ˜๋ก ๋Š๋ ค์ง„๋‹ค.
SSAO
ํ€„๋ฆฌํ‹ฐ์™€ ํผํฌ๋จผ์Šค๋ฅผ ๋†’์ด๊ธฐ ์œ„ํ•œ ๋ฐœ์ „ ๋ฐฉํ–ฅ


์ตœ์†Œ์˜ ๋ฆฌ์†Œ์Šค
์ตœ์†Œ์˜ ์—ฐ์‚ฐ
๋‹ค์–‘ํ•œ ๋ฐฉ๋ฒ•๋“ค์ด ์ƒ๊ฒจ๋‚ฌ๋‹ค.
โ€ข   Ambient Occlusion(AO)
โ€ข   SSAO
โ€ข   ๊นŠ์ด ๋ฒ„ํผ SSAO
โ€ข   ๋ทฐ ์ŠคํŽ˜์ด์Šค ๋…ธ๋ง, ๊นŠ์ด SSAO
๊นŠ์ด ๋ฒ„ํผ SSAO

DepthBuffer -> SSAO Buffer -> Lighting

  ๊นŠ์ด ๋ฒ„ํผ๋ฅผ ๊ฐ€์ง€๊ณ  AO๋ฅผ ๊ตฌํ•˜๋Š” ๊ธฐ๋ฒ•
๊นŠ์ด ๋ฒ„ํผ SSAO
๊นŠ์ด ๋ฒ„ํผ SSAO
๊นŠ์ด ๋ฒ„ํผ SSAO

             ํ•ด๋‹น ๋ฒ”์œ„
             ์—์„œ ํƒ์ƒ‰
๊นŠ์ด ๋ฒ„ํผ SSAO




๋‹จ์ˆœํ™”๋œ ์ƒ˜ํ”Œ๋ง ์ปค๋„
๊นŠ์ด ๋ฒ„ํผ SSAO
๊นŠ์ด ๋ฒ„ํผ SSAO
๊นŠ์ด ๋ฒ„ํผ SSAO
๊นŠ์ด ๋ฒ„ํผ SSAO
๊นŠ์ด ๋ฒ„ํผ SSAO
๊นŠ์ด ๋ฒ„ํผ SSAO




์ƒ˜ํ”Œ๋ง ์ปค๋„ ๋ฒกํ„ฐ ์ƒ์„ฑ
๊นŠ์ด ๋ฒ„ํผ SSAO
์ž„์˜์˜ ๋…ธ๋ง๋งต




 ๋žœ๋คํ•˜๊ฒŒ ๋ฒกํ„ฐ ์–ป์–ด์˜ค๊ธฐ
๊นŠ์ด ๋ฒ„ํผ SSAO




๊ฑฐ๋ฆฌ์— ๋”ฐ๋ฅธ ์ปค๋„ ์‚ฌ์ด์ฆˆ ๊ตฌํ•˜๊ธฐ
๊นŠ์ด ๋ฒ„ํผ SSAO


       ๋ฐ˜์‚ฌ๋ฅผ ์ด์šฉํ•ด ๋žœ๋ค์„ฑ์„ ๋” ๋ถ€์—ฌ




Ambient Occlusion ๊ตฌํ•˜๊ธฐ
๊นŠ์ด ๋ฒ„ํผ SSAO




๋”ํ•ด์ค€ ๋งŒํผ ๋‚˜๋ˆ ์ค˜์„œ ์ •๊ทœํ™”
๊นŠ์ด ๋ฒ„ํผ SSAO
๊นŠ์ด ๋ฒ„ํผ SSAO
์•ž์—์„œ ๋งŒ๋“  SSAO ๋ฒ„ํผ๋ฅผ ์ฝ์–ด์™€ ์ผ๋ฐ˜ ์กฐ๋ช…๊ณ„
์‚ฐ์— ์ถ”๊ฐ€ํ•ด์ค€๋‹ค.

๋ถ€๋“œ๋Ÿฌ์šด ๊ฒฐ๊ณผ๋ฅผ ์–ป์œผ๋ ค๋ฉด ์ƒ˜ํ”Œ๋ง ํ•ด์ฃผ๋ฉด ๋œ๋‹ค.
๊นŠ์ด ๋ฒ„ํผ SSAO
๊นŠ์ด ๋ฒ„ํผ SSAO
โ€ข   Ambient Occlusion(AO)
โ€ข   SSAO
โ€ข   ๊นŠ์ด ๋ฒ„ํผ SSAO
โ€ข   ๋ทฐ ์ŠคํŽ˜์ด์Šค ๋…ธ๋ง, ๊นŠ์ด SSAO
๋ทฐ ์ŠคํŽ˜์ด์Šค ๋…ธ๋ง, ๊นŠ์ด
       SSAO
์œ„ ๋ฐฉ์‹์—๋Š” ๋ฌธ์ œ์ ์ด ๋ณด์ธ๋‹ค.




Halo : ๊ฒฝ๊ณ„ ๋ถ€๋ถ„์—์„œ ํฐ์ƒ‰์ด ๋‚˜ํƒ€๋‚œ๋‹ค.
Self Occlusion : ์ „์ฒด์ ์œผ๋กœ ํšŒ์ƒ‰๊ธ‰์ด๋‹ค.
๋ทฐ ์ŠคํŽ˜์ด์Šค ๋…ธ๋ง, ๊นŠ์ด SSAO




๊ตฌ ๋ฒ”์œ„์—์„œ ์ฐจํ๋œ ์ •๋„๊ฐ€ ๊ฐ’์œผ๋กœ ์ •ํ•ด์ง€๊ธฐ ๋•Œ๋ฌธ.
๋ทฐ ์ŠคํŽ˜์ด์Šค ๋…ธ๋ง, ๊นŠ์ด
      SSAO


์•„์ด๋””์–ด๋Š” ๊ฐ€์ ธ์˜ค๋˜ ๋‹ค๋ฅธ ๋ฐฉ๋ฒ•์ด ๋งŽ์ด ๊ณ ๋ ค๋˜
์—ˆ๋‹ค.

๊ทธ ์ค‘ ๋ทฐ ์ŠคํŽ˜์ด์Šค ๋…ธ๋ง, ๊นŠ์ด SSAO๋ฅผ ์•Œ์•„๋ณด
์ž.
๋ทฐ ์ŠคํŽ˜์ด์Šค ๋…ธ๋ง, ๊นŠ์ด
      SSAO
๋จผ์ € ๋ทฐ ์ŠคํŽ˜์ด์Šค ๋…ธ๋ง, ๊นŠ์ด ๋งต์„ ๋งŒ๋“ ๋‹ค.
๋ทฐ ์ŠคํŽ˜์ด์Šค ๋…ธ๋ง, ๊นŠ์ด
      SSAO
๋จผ์ € ๋ทฐ ์ŠคํŽ˜์ด์Šค ๋…ธ๋ง, ๊นŠ์ด ๋งต์„ ๋งŒ๋“ ๋‹ค.
๋ทฐ ์ŠคํŽ˜์ด์Šค ๋…ธ๋ง, ๊นŠ์ด
      SSAO
๊ณ„์‚ฐ์— ํ•„์š”ํ•œ ๊ฒƒ์€ ์œ„์น˜๊ฐ’์ด๊ธฐ ๋•Œ๋ฌธ์— ๊นŠ์ด๊ฐ’
์„ ์ด์šฉํ•ด์„œ ์œ„์น˜๊ฐ’์„ ์–ป์–ด์˜ค๋Š” ๋ฐฉ๋ฒ•์— ๋Œ€ํ•ด์„œ
์•Œ์•„๋ณด์ž.



* ์œ„์น˜๋ฅผ ๋‹ด์•„๋‘” ๋งต์ด ์žˆ์œผ๋ฉด ๊ทธ๋ƒฅ ์‚ฌ์šฉํ•˜๋ฉด ๋œ
๋‹ค.
๋ทฐ ์ŠคํŽ˜์ด์Šค ๋…ธ๋ง, ๊นŠ์ด SSAO




Frustum ์ขŒํ‘œ๋ฅผ ์ด์šฉํ•ด์„œ ์œ„์น˜๋ฅผ ์–ป์–ด์˜ฌ ์ˆ˜ ์žˆ๋‹ค.
๋ทฐ ์ŠคํŽ˜์ด์Šค ๋…ธ๋ง, ๊นŠ์ด
    SSAO
๋ทฐ ์ŠคํŽ˜์ด์Šค ๋…ธ๋ง, ๊นŠ์ด
     SSAO




Frustum ์ขŒํ‘œ๋ฅผ ๋งŒ๋“ค์–ด์„œ ์‰์ด๋”์— ๋„˜๊ฒจ์ค€๋‹ค.
๋ทฐ ์ŠคํŽ˜์ด์Šค ๋…ธ๋ง, ๊นŠ์ด SSAO




Quad๋ฅผ ๊ทธ๋ ค์ค„๋•Œ normal์— ์ธ๋ฑ์Šค๊ฐ’์„ ๋„ฃ์–ด์ค€๋‹ค.
๋ทฐ ์ŠคํŽ˜์ด์Šค ๋…ธ๋ง, ๊นŠ์ด
       SSAO




Vertex Shader์—์„œ ์•„๊นŒ ๊ตฌํ–ˆ๋˜ Frustum ์ขŒํ‘œ
๋ฅผ Pixel Shader๋กœ ๋ณด๋‚ด์ค€๋‹ค.
๋ทฐ ์ŠคํŽ˜์ด์Šค ๋…ธ๋ง, ๊นŠ์ด SSAO

ํ˜„์žฌ ํ”ฝ์…€์— ํ•ด๋‹นํ•˜๋Š” ๋ทฐ ๊ณต๊ฐ„ ์œ„์น˜๋ฅผ ์–ป์–ด์˜จ๋‹ค.


๋žœ๋ค ๋ฒกํ„ฐ๋ฅผ ๋งŒ๋“ค์–ด ๋‚ธ๋‹ค.


* offset ๋ฒกํ„ฐ๋ฅผ ๊ตฌํ•˜๋Š” ๋ถ€๋ถ„์€ ์œ„์˜ ๋‚ด์šฉ๊ณผ ๊ฐ™๋‹ค.
๋ทฐ ์ŠคํŽ˜์ด์Šค ๋…ธ๋ง, ๊นŠ์ด SSAO

Offset ๋ฒกํ„ฐ์™€ ๋…ธ๋ง์˜ ๋‚ด์ ์„ ๊ตฌํ•ด์„œ ๋ถ€ํ˜ธ๋ฅผ ๊ตฌํ•œ
๋‹ค.


ํ˜„์žฌ ์œ„์น˜์—์„œ ๋ถ€ํ„ฐ ์ฐจํ๋ฅผ ๊ฒ€์‚ฌํ•  ๋ฒกํ„ฐ๋ฅผ ๊ตฌํ•œ๋‹ค.


* flip์„ ๊ณฑํ•ด์คŒ์œผ๋กœ์จ ๋ฐ˜๊ตฌ ๋ฐฉํ–ฅ์œผ๋กœ๋งŒ ๊ณ„์‚ฐ
๋ทฐ ์ŠคํŽ˜์ด์Šค ๋…ธ๋ง, ๊นŠ์ด
       SSAO

๊ตฌํ•œ ๋ฒกํ„ฐ์— Projection * Texture Projection ํ–‰
๋ ฌ์„ ๊ณฑํ•ด์„œ ์Šคํฌ๋ฆฐ ์ขŒํ‘œ๋ฅผ ๊ตฌํ•œ๋‹ค.



๊ตฌํ•œ ์ขŒํ‘œ์— ํ•ด๋‹นํ•˜๋Š” ๊นŠ์ด๊ฐ’์„ ๊ตฌํ•˜๊ณ  ๊นŠ์ด๊ฐ’
์— ๋งค์น˜๊ฐ€ ๋˜๋Š” ๋ทฐ ๊ณต๊ฐ„ ์ขŒํ‘œ๋ฅผ ๊ตฌํ•œ๋‹ค.
๋ทฐ ์ŠคํŽ˜์ด์Šค ๋…ธ๋ง, ๊นŠ์ด
    SSAO
๋ทฐ ์ŠคํŽ˜์ด์Šค ๋…ธ๋ง, ๊นŠ์ด SSAO




P์™€ R์€ ๊ฐ™์€ ํ‰๋ฉด์ƒ์— ์žˆ์œผ๋ฏ€๋กœ ์ฐจํ ๊ณ„์‚ฐ์—์„œ
์ œ์™ธ์‹œ์ผœ์•ผ ํ•œ๋‹ค. -> ๋…ธ๋ง์„ ์ด์šฉํ•ด์„œ ๊ณ„์‚ฐ
๋ทฐ ์ŠคํŽ˜์ด์Šค ๋…ธ๋ง, ๊นŠ์ด
      SSAO

๋…ธ๋ง๊ณผ์˜ ๋‚ด์ ์—ฐ์‚ฐ์„ ํ•ด์„œ ๊ทธ ๊ฐ’์„ Occlusion๊ฐ’
์— ์ ์šฉํ•œ๋‹ค. (๊ฐ™์€ ํ‰๋ฉด์ด๋ฉด 0)



์ฐจํ๋œ ๊ฐ’์„ ๊ตฌํ•˜๋ฉด ๋œ๋‹ค.
๋ทฐ ์ŠคํŽ˜์ด์Šค ๋…ธ๋ง, ๊นŠ์ด SSAO




์ฐจํ ๊ณ„์‚ฐ์— ๋Œ€ํ•ด์„œ Eipsilon ๊ฐ’์„ ๋‘์–ด์„œ ํŠน์ • ๊ฑฐ
๋ฆฌ๋Š” ๊ณ„์‚ฐ์—์„œ ์ œ์™ธ์‹œํ‚ค๊ณ  ์ฐจํ๋ฅผ ๊ณ„์‚ฐํ•  ๊ฑฐ๋ฆฌ์˜
๋ฒ”์œ„๋ฅผ ๋‘์–ด์„œ ์„ ํ˜•์ ์œผ๋กœ ๊ณ„์‚ฐํ•œ๋‹ค. (๊ฐ’์˜ ์กฐ์ ˆ์ด
ํ•„์š”)
๋ทฐ ์ŠคํŽ˜์ด์Šค ๋…ธ๋ง, ๊นŠ์ด
      SSAO



์ฐจํ๋ฅผ ๊ณ„์‚ฐํ•œ ๋งŒํผ ๋‚˜๋ˆ ์ค˜์„œ ์ฐจํ ๊ฐ’์„ ๋งž์ถฐ์ค€
๋‹ค.
์ฐจํ๋œ ๊ฐ’์„ ์ ์ ˆํžˆ ๋ณ€ํ™”๋ฅผ ์ค˜์„œ ์ ์šฉํ•˜๋ฉด ๋œ
๋‹ค.
๋ทฐ ์ŠคํŽ˜์ด์Šค ๋…ธ๋ง, ๊นŠ์ด
    SSAO
๋ทฐ ์ŠคํŽ˜์ด์Šค ๋…ธ๋ง, ๊นŠ์ด
      SSAO
์ ์ ˆํžˆ ๊ณ„์‚ฐ์ด ๋œ ๊ฒƒ ๊ฐ™๊ธฐ๋Š” ํ•˜์ง€๋งŒ ๋ฐ”๋กœ ์ ์šฉ
ํ•˜๊ธฐ์—๋Š” ๋ถ€๋“œ๋Ÿฌ์›Œ ๋ณด์ด์ง€ ์•Š๋Š”๋‹ค.

SSAO๋ฅผ ๊ตฌํ˜„ํ•˜๋ฉด SSAO ๋งต์„ ๋งŒ๋“  ๋‹ค์Œ ๋‚˜์˜ค
๋Š” ๋ถ€๋ถ„์ด ๋ฐ”๋กœ Blur๋ฅผ ์ ์šฉํ•˜๋Š” ๊ฒƒ์ด๋‹ค.
๋ทฐ ์ŠคํŽ˜์ด์Šค ๋…ธ๋ง, ๊นŠ์ด
      SSAO
Blur๋ฅผ ๊ณ„์‚ฐํ•  ๋•Œ ๊ณ ๋ คํ•ด์•ผํ•  ์ ์€

๊ฒฝ๊ณ„๋ถ€๋ถ„์€ ์œ ์ง€๋ฅผ ํ•˜๋ฉด์„œ (Edge Preserving)
๋…ธ์ด์ฆˆ๋ฅผ ๋ถ€๋“œ๋Ÿฝ๊ฒŒ ๋ณ€ํ™˜์‹œํ‚ค๋Š” ๊ฒƒ์ด๋‹ค.
(Smooth)

๋…ธ๋ง, ๊นŠ์ด ๋งต์„ ์ฐธ์กฐํ•ด์„œ Blur๋ฅผ ๊ณ„์‚ฐํ•  ์ˆ˜ ์žˆ
๋‹ค.
๋ทฐ ์ŠคํŽ˜์ด์Šค ๋…ธ๋ง, ๊นŠ์ด
      SSAO
ํ•ต์‹ฌ ์•Œ๊ณ ๋ฆฌ์ฆ˜๋งŒ ๋ณด๋ฉดโ€ฆ


ํ˜„์žฌ ํ”ฝ์…€์˜ ๋…ธ๋ง๊ฐ’๊ณผ ๊นŠ์ด๊ฐ’์„ ๊ตฌํ•ด๋‘”๋‹ค.

์ƒ˜ํ”Œ๋งํ•  ํ”ฝ์…€์˜ ๋…ธ๋ง๊ฐ’๊ณผ ์˜ ๋‚ด์ ๊ณผ ๊นŠ์ด ์ฐจ์ด
๋ฅผ ํ†ต๊ณผํ•œ ๋ถ€๋ถ„๋งŒ ์ƒ˜ํ”Œ๋ง์„ ํ•จ์œผ๋กœ์จ ๊ฒฝ๊ณ„๋ฅผ ์œ 
์ง€ํ•  ์ˆ˜ ์žˆ๋‹ค.
๋ทฐ ์ŠคํŽ˜์ด์Šค ๋…ธ๋ง, ๊นŠ์ด
    SSAO
๋ทฐ ์ŠคํŽ˜์ด์Šค ๋…ธ๋ง, ๊นŠ์ด
    SSAO
๋ทฐ ์ŠคํŽ˜์ด์Šค ๋…ธ๋ง, ๊นŠ์ด
    SSAO
๋ทฐ ์ŠคํŽ˜์ด์Šค ๋…ธ๋ง, ๊นŠ์ด
    SSAO
๋ทฐ ์ŠคํŽ˜์ด์Šค ๋…ธ๋ง, ๊นŠ์ด
    SSAO
๋ฐœ์ „
โ€ข SSDO
โ€ข HDAO
โ€ข HBAO



  ์ฐพ์•„์„œ ์ •๋ฆฌํ•˜๋Š”๋Œ€๋กœ ์˜ฌ๋ฆฌ๊ฒ ์Šต๋‹ˆ๋‹ค. -0-;;
๊ฒฐ๋ก 
SSAO๋Š” Ambient Occlusion์„ ์‹ค์‹œ๊ฐ„์œผ๋กœ ์ 
์šฉํ•˜๋ ค๋Š” ๋…ธ๋ ฅ์—์„œ ๋‚˜์˜จ ๊ธฐ๋ฒ•์ค‘ ํ•˜๋‚˜๊ณ  ์ ์ฐจ ๋ฐœ
์ „ํ•ด ๋‚˜๊ฐ€๊ณ  ์žˆ๋‹ค.

Deferred Rendering๋“ฑ ์š”์ฆ˜ ํŠธ๋ Œ๋“œ์ƒ์—์„œ ๊ธฐ๋ณธ
์ ์œผ๋กœ ๋…ธ๋ง, ๊นŠ์ด, ์œ„์น˜ ๋งต์„ ์–ป์–ด์˜ค๊ธฐ ๋•Œ๋ฌธ์—
์ ์šฉํ•˜๊ธฐ ์–ด๋ ต์ง€๋Š” ์•Š์„ ๊ฒƒ์ด๋‹ค.
๊ฒฐ๋ก 
๊ฒŒ์ž„์— ๋”ฐ๋ผ์„œ ์ ์šฉํ–ˆ์„ ๋•Œ ํšจ๊ณผ๊ฐ€ ์žˆ๋Š” ํ”„๋กœ์ 
ํŠธ๊ฐ€ ์žˆ๊ณ  ์•„๋‹Œ ํ”„๋กœ์ ํŠธ๊ฐ€ ์žˆ์„ ๊ฒƒ์ด๋‹ค. ์ƒํ™ฉ
์— ๋”ฐ๋ผ์„œ ์„ฑ๋Šฅ๋น„๊ฐ€ ๊ทธ๋ ‡๊ฒŒ ๋†’์ง€ ์•Š์„ ์ˆ˜ ์žˆ์œผ
๋‹ˆ ๋ฌด์กฐ๊ฑด ์‚ฌ์šฉํ•˜๊ฒ ๋‹ค๋Š” ์ƒ๊ฐ์€ ๋ฒ„๋ฆฌ๋Š”๊ฒŒ ์ข‹๊ฒ 
๋‹ค.

์ •์ ์ธ ์˜ค๋ธŒ์ ํŠธ๊ฐ€ ๋งŽ๋‹ค๋ฉด ๋ผ์ดํŠธ๋งต์„ ์ ์šฉํ•˜
๋Š”๊ฒŒ ํ€„๋ฆฌํ‹ฐ๋„ ์ข‹๊ณ  ๋น ๋ฅผ๊ฒƒ์ด๋‹ค.
์ฐธ๊ณ ์ž๋ฃŒ
http://en.wikipedia.org/wiki/Ambient_occlusion
D3DBook
A Simple and Practical Approach to SSAO
http://blog.naver.com/sorkelf/40147954876
๋

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ํฌ๊ฒŒ, ์•„๋ฆ„๋‹ต๊ฒŒ,๋น ๋ฅด๊ฒŒ, ์ผ๊ด€๋˜๊ฒŒ ๋งŒ๋“ค๊ธฐ: Just Cause 2 ๊ฐœ๋ฐœ์—์„œ ๋ฐฐ์šด ๊ตํ›ˆ๋“ค (GPU Pro)ํฌ๊ฒŒ, ์•„๋ฆ„๋‹ต๊ฒŒ,๋น ๋ฅด๊ฒŒ, ์ผ๊ด€๋˜๊ฒŒ ๋งŒ๋“ค๊ธฐ: Just Cause 2 ๊ฐœ๋ฐœ์—์„œ ๋ฐฐ์šด ๊ตํ›ˆ๋“ค (GPU Pro)
ํฌ๊ฒŒ, ์•„๋ฆ„๋‹ต๊ฒŒ,๋น ๋ฅด๊ฒŒ, ์ผ๊ด€๋˜๊ฒŒ ๋งŒ๋“ค๊ธฐ: Just Cause 2 ๊ฐœ๋ฐœ์—์„œ ๋ฐฐ์šด ๊ตํ›ˆ๋“ค (GPU Pro)
ย 

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