Chip, your refutation would be more impressive if the image was of an outdoor scene with light coming from a cloudy sky. A realistic approach would require soft, low contrast shadows. Vue appears to be using both the overcast and the direct sunlight approach at the same time. 

Of course an indoor scene with a roof is not comparable to an outdoor scene with a luminous, cloud-filled skydome, especially when the light source is not from an overcast sky. 

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