> The second image was, naturally, several times slower to
> render.


It would be possible, and perhaps convenient for some, to add a keyword to
the area light which causes it to behave like a grid of lights for diffuse
and specular lighting effects. The only advantage of this over an actual
grid of lights is that not every light has to be sampled for shadows (the
adaptive sampling can be used), but this is a significant advantage.

 - Slime
 [ http://www.slimeland.com/ ]

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