Ambient occlusion can be simulated with a light-dome. Render your render in grayscale with a lightdome and composite with your textured render in psp or photoshop or something similar :) You could also render it all at once straight with textures and light-dome in one render. But it's way more flexible to combine the two in post as you can do so much more tweaking that way, and without having to wait hours for each tweak to render.

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