Screen space directional occlusion

Screen space directional occlusion (SSDO) is a computer graphics technique enhancing screen space ambient occlusion (SSAO) by taking direction into account to sample the ambient light (both the light coming directly at an object, as well as the light reflected off of the object directly behind it), to better approximate global illumination.[1][2][3][4]

References
  1. "What is Ambient Occlusion? Does it Matter in Games?".
  2. "SSDO: Screen Space Directional Occlusion | Geeks3D".
  3. "SSDO" (PDF).
  4. "Deferred Screen Space Directional Occlusion".
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