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1. Use a directional light for the sun, so that the 'sunrays' will be parallel.
2. Use a Skylight for the fill, but enable the 'Cast Shadows' flag.
This will give you soft ambient occlusion (= inside of buildings are dark) and a hard sun-shadow.
Alternatively you can use mentalray to render the ambient occlusion with more control than the default skylight.
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