Screen space directional occlusion explained

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]}

Notes and References

1. Web site: What is Ambient Occlusion? Does it Matter in Games? .
2. Web site: SSDO: Screen Space Directional Occlusion | Geeks3D .
3. Web site: SSDO.
4. Web site: Deferred Screen Space Directional Occlusion .