In Softimage 2014, Autodesk market a new GPU accelerated Ambiant Occlusion mode.
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http://download.autodesk.com/global/docs/softimage2014/en_us/userguide/index.html?url=files/property8057.htm,topicNumber=d30e798218
Thank you,
PS I do not manage to activate it on a single render... Even if I activate the checkbox in Mental Ray render options. What is strange is that AO GPU has it's own settings : not compatible with render tree Ambiant Occlusion shader ???