Hi,

Does anyone know if there is a way to achieve this kind of AO?
As far as I understand the issue, it is based on points(vertices), on the geometry so it can give incredible times in render process.

http://www.blender.org/development/release-logs/blender-246/approximate-ambient-occlusion/ [blender.org]

http://forums.odforce.net/index.php?/topic/7308-how-to-do-ssao-in-houdini-screen-space-ambient-occlusion [forums.odforce.net]