197### [at] 3-enet...
> For lighting (rather than reflection mapping) you would not need more than
> the brightest 10% of pixels in the image, these could be lights behind a
> translucent sphere that held the matching image map so that you still had
> reflection/environment mapping. The lights would need to be directed at
the
> center of the sphere so as to avoid them illuminating the dark parts of
the
> map/sky.

In fact before I tested HDRI I tried the following method with radiosity (to
use with an environment sphere):
texture{
    image_pattern{jpg "mymap"} // grayscale map used to create variations in
light intensity
    texture_map{
        [0 T_Sky {finish{ambient 0}
        ....
        [i T_Sky {finish{ambient j}
        ....
        [1 T_Sky {finish{ambient 10}
    }
}

I didn't manage to get good results though. HDRI is much easier to set up
(of course having HDR maps helps a lot...).

G.


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