Screen Space Ambient Occlusion (SSAO) represents that class of algorithms, which compute occlusion in image space (screen space). In contrast to object space, screen space is the coordinate system given after projection, at the end of the pipeline where viewport  [ Read More ]

The following techniques compute AO in object space. This space comprises all coordinate systems among the rendering pipeline defined before stage of projection: local model coordinate system, world coordinate system, camera coordinate system. [Mill93] first published a concept being very  [ Read More ]