[Bf-cycles] ray depth

[Greg Zaal]

Done some tests too and David is right.

128 bounces, 5:14 - http://i.imgur.com/XFdhp9l.png
128 bounces with Ray Depth trick, 5:11 - http://i.imgur.com/p8kL5ki.png
0 bounces, 4:10 - http://i.imgur.com/xQdrSQD.png

Nodes used for one of the lamps: http://i.imgur.com/MBsi7hh.png (also tried
http://i.imgur.com/htdCsxi.png - made no difference)
Blend file: http://pasteall.org/blend/31928

Cheers,
Greg
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