屏幕空间环境光遮蔽

屏幕空间环境光遮蔽（Screen Space Ambient Occlusion，SSAO）一种用于在计算机图形中实时实现近似环境光遮蔽效果的渲染技术。由Vladimir Kajalin于在Crytek工作时开发，该算法作为像素着色器，通过分析场景中纹理的深度值缓冲来实现，可以近似地表现出物体在环境光下产生的阴影。首次使用该特效的是2007年由Crytek开发的电脑游戏Crysis。

使用SSAO的游戏

孤岛危机 (2007) (Windows) ^[1]
战争机器2 (2008) (Xbox 360)^[2]
潜行者：晴空 (2008) (Windows)^[3]
孤岛危机：弹头 (2008) (Windows) ^[1]
帝国：全面战争 (2009) (Windows)^[4]
无主之地 (2009) (Windows and Xbox 360 versions)^[5]
极度恐慌2：起源计划 (2009) (Windows) ^[6]
蝙蝠侠：阿卡姆疯人院' (2009) (Windows and Xbox 360 versions)^[7]
神秘海域2：纵横四海 (2009) (PlayStation 3)^[8]
潜行者：普里皮亚季的召唤 (2009) (Windows)^[9]
拿破仑：全面战争 (2010) (Windows)^[10]
正当防卫2 (2010) (Windows)^[11]
地铁2033 (2010) (Windows and Xbox 360 versions)^[12]
心灵杀手 (2010) (Xbox 360)^[13]
星战前夜 (Nvidia GPUs only) ^[14]
光环：致远星 (2010) (Xbox 360)^[15]^[16]
星际争霸II：自由之翼 (2010) (Windows) (after Patch 1.2.0 released 1/12/2011)^[17]
英雄城市 (2010) (Windows) ^[18]
武装突袭2 (2009-2010) (Windows)^[19]
工人物语7：王国之路 (2010) (Windows) ^[20]
黑手党II (2010) (Windows and Xbox 360)^[21]^[22]
失忆症：黑暗后裔 (2010) (Windows)^[23]
刺客信条：兄弟会 (2010) (PlayStation 3 and Xbox 360)^[24]
战地：叛逆连队2 (2010) (Windows) (uses HBAO - improved form of SSAO)^[25]
龙腾世纪2 (2011) (Windows)^[26]
孤岛危机2 (2011) (Windows, Xbox 360 and PlayStation 3)^[27]
黑色洛城 (2011) (PlayStation 3, Xbox 360 and Windows)^[28]
黑客入侵：人类革命 (2011) (PlayStation 3, Xbox 360 and Windows)^[29]
死亡岛 (2011) (PlayStation 3, Xbox 360 and Windows)^[30]
战地3 (2011) (PlayStation 3, Xbox 360 and Windows)^[31]
使命召唤：现代战争3 (2011) (Windows version only)^[32]
黑街圣徒3 (2011) (PlayStation 3, Xbox 360 and Windows)^[33]
极度恐慌3 (2011) (Windows and Xbox 360)
魔兽世界：熊猫人之谜 (2012) (Windows) (该特性首次使用于熊猫人之谜资料包)
欧洲卡车模拟2 (2012) (windows, Mac OS X, Linux) (1.38 Open Beta)
美国卡车模拟 (2016) (windows, Mac OS X, Linux) (1.38 Open Beta)

参考文献

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CryENGINE® 2. Crytek. [2011-08-26]. （原始内容存档于2011-08-15）.
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Gears of War Series | Showcase | Unreal Technology. Unrealengine.com. 2008-11-07 [2011-08-26]. （原始内容存档于2011-08-19）.
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STALKER: Clear Sky Tweak Guide. TweakGuides.com. [2011-08-26]. （原始内容存档于2011-08-04）.
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Empire: Total War – No anti-aliasing in combination with SSAO on Radeon graphics cards – Empire Total War, anti-aliasing, SSAO, Radeon, Geforce. PC Games Hardware. 2009-03-11 [2011-08-26]. （原始内容存档于2012-04-17）（德语）.
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Head2Head: Borderlands Analysis. Lens of Truth. 2009-10-29 [2011-08-26]. （原始内容存档于2011-08-23）.
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参见

环境光遮蔽
屏幕空间定向遮蔽（英语：Screen space directional occlusion）（SSDO）

外部链接

Finding Next Gen – CryEngine 2
Video showing SSAO in action （页面存档备份，存于互联网档案馆）
Image Enhancement by Unsharp Masking the Depth Buffer （页面存档备份，存于互联网档案馆）
Hardware Accelerated Ambient Occlusion Techniques on GPUs （页面存档备份，存于互联网档案馆）
Real-Time Depth Buffer Based Ambient Occlusion （页面存档备份，存于互联网档案馆）
Source code of SSAO shader used in Crysis （页面存档备份，存于互联网档案馆）
Approximating Dynamic Global Illumination in Image Space （页面存档备份，存于互联网档案馆）
Accumulative Screen Space Ambient Occlusion
NVIDIA has integrated SSAO into drivers （页面存档备份，存于互联网档案馆）
Several methods of SSAO are described in ShaderX7 book （页面存档备份，存于互联网档案馆）
SSAO Shader ( Russian ) Archived 2012-05-19 at WebCite

[crysis_1-1] [1]
CryENGINE® 2. Crytek. [2011-08-26]. （原始内容存档于2011-08-15）.

[2] [2]
Gears of War Series | Showcase | Unreal Technology. Unrealengine.com. 2008-11-07 [2011-08-26]. （原始内容存档于2011-08-19）.

[3] [3]
STALKER: Clear Sky Tweak Guide. TweakGuides.com. [2011-08-26]. （原始内容存档于2011-08-04）.

[4] [4]
Empire: Total War – No anti-aliasing in combination with SSAO on Radeon graphics cards – Empire Total War, anti-aliasing, SSAO, Radeon, Geforce. PC Games Hardware. 2009-03-11 [2011-08-26]. （原始内容存档于2012-04-17）（德语）.

[5] [5]
Head2Head: Borderlands Analysis. Lens of Truth. 2009-10-29 [2011-08-26]. （原始内容存档于2011-08-23）.

[6] [6]
存档副本. [2012-04-29]. （原始内容存档于2012-03-21）.

[7] [7]
Head2Head – Batman: Arkham Asylum. Lens of Truth. 2009-08-24 [2011-08-26]. （原始内容存档于2011-08-21）.

[8] [8]
Among Friends: How Naughty Dog Built Uncharted 2 – Page 3 | DigitalFoundry. Eurogamer.net. 2010-03-20 [2011-08-26]. （原始内容存档于2010-07-21）.

[9] [9]
存档副本. [2012-04-29]. （原始内容存档于2012-05-01）.

[10] [10]
存档副本. [2012-04-29]. （原始内容存档于2012-04-17）.

[11] [11]
存档副本. [2012-04-29]. （原始内容存档于2010-03-06）.

[12] [12]
存档副本. [2012-04-29]. （原始内容存档于2014-11-13）.

[13] [13]
Alan Wake FAQ – Alan Wake Community Forums. Forum.alanwake.com. [2011-08-26]. （原始内容存档于2011-07-27）.

[14] [14]
CCP. EVE Insider | Patchnotes. EVE Online. [2011-08-26]. （原始内容存档于2011-09-02）.

[15] [15]
Bungie Weekly Update: 04.16.10 : 4/16/2010 3:38 PM PDT. Bungie.net. [2011-08-26]. （原始内容存档于2011年9月16日）.

[16] [16]
Halo: Reach beta footage analysis – Page 1 | DigitalFoundry. Eurogamer.net. 2010-04-25 [2011-08-26]. （原始内容存档于2012-02-22）.

[17] [17]
Entertainment, Blizzard. Patch 1.2.0 Now Live – StarCraft II. Us.battle.net. 2011-08-19 [2011-08-26]. （原始内容存档于2011-09-03）.

[18] [18]
Issue 17: Dark Mirror Patch Notes | City of Heroes® : The Worlds Most Popular Superpowered MMO. Cityofheroes.com. [2011-08-26]. （原始内容存档于2011-07-18）.

[19] [19]
Ask Bohemia (about Operation Arrowhead... or anything else you want to ask)! – Bohemia Interactive Community. Community.bistudio.com. 2010-05-06 [2011-08-26]. （原始内容存档于2011-07-19）.

[20] [20]
now to post a comment!. The Settlers 7: Paths to a Kingdom – Engine. YouTube. 2010-03-21 [2011-08-26]. （原始内容存档于2015-07-07）.

[21] [21]
存档副本. [2012-04-29]. （原始内容存档于2012-04-02）.

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存档副本. [2012-04-29]. （原始内容存档于2012-04-28）.

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存档副本. [2012-04-29]. （原始内容存档于2012-04-28）.

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Face-Off: Assassin's Creed: Brotherhood – Page 2 | DigitalFoundry. Eurogamer.net. 2010-11-18 [2011-08-26]. （原始内容存档于2011-09-08）.

[25] [25]
存档副本. [2012-04-29]. （原始内容存档于2012-03-28）.

[26] [26]
存档副本. [2012-04-29]. （原始内容存档于2012-05-03）.

[27] [27]
存档副本 (PDF). [2012-04-29]. （原始内容 (PDF)存档于2014-07-26）.

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Face-Off: L.A. Noire – Page 1 | DigitalFoundry. Eurogamer.net. 2011-05-23 [2011-08-26]. （原始内容存档于2011-08-14）.

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存档副本. [2012-04-29]. （原始内容存档于2012-04-28）.

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存档副本. [2012-04-29]. （原始内容存档于2012-05-04）.

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存档副本 (PDF). [2012-04-29]. （原始内容 (PDF)存档于2012-03-03）.

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存档副本. [2012-04-29]. （原始内容存档于2012-04-28）.

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存档副本. [2012-04-29]. （原始内容存档于2014-05-18）.

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