
But how could you possible setup AO with indigo?! All it says is that Sunlight in Blender is interpreted by Indigo exporter as sun/physical sky.
There is a quotation from the document: "Indigo does not need any render parameters like GI samples, AO samples, AA samples, Soft shadows,
etc, and complicated lightning setups to achieve realistic results."
So I am thinking of Blender's internal render since Scorpius mentioned AO.