I started a experiment to fake the "HDRI look", and found a simple and 
nice-looking way to do "image_map lighting" with only one radiosity level.

The trick consists on two concentric spheres, the outern one for rad 
lighting, and the inner one for reflection. The exterior sphere uses a 
gray pigment function of the image_map, with high poly_wave and and high 
ambient.

More tests here:

http://ignorancia.org/images/tests/jarron-9a.jpg
http://ignorancia.org/images/tests/jarron-9b.jpg
http://ignorancia.org/images/tests/jarron-9d.jpg
http://ignorancia.org/images/tests/jarron-11a.jpg
http://ignorancia.org/images/tests/jarron-11b.jpg
http://ignorancia.org/images/tests/jarron-11c.jpg

Some of them use suitable spherical photos found on the net, others use 
my own prior scenes rendered with spherical camera.

I will make a macro and post it later.

Regards...

--
Jaime

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