Looking good!

You're absolutely right; radiosity just isn't necessary as often as we use it.
With outdoor scenes like this I will sometimes cut it down to three small
lights --- the sun (direct light and shadows), a blue sky-light (for scattered
light from the atmosphere, no shadow) and a light of the predominant color of
the scene (as a super-rough approximation of the first-bounce of radiosity,
again no shadow). If I want a little more realism, I make 'em small area
lights.

-S

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