Credits: ArKano22 of gamedev.net for the original implementation
this is a proof of concept copy/paste-job from a relatively new SSAO implementation as initially posted by ArKano22 on gamedev.net. looks quite useable, check the ready-to-use module in the attachment.
there is still room for improvement though, especially with the global illumination technique that yet needs a better compositing mode with the original. also later in the thread ArKano22 postet a rendermonkey document that still could be compared for further source improvements.
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