Redjack <nomail@nomail> wrote:
> I use 25 successive transparent boxes with different IOR's to simulate a
> desert mirage ... The problem I get is that although I set transmit 1 I
> have a vast diminuition in light intensity.
> I would appreciate any piece of advice you got! If i haven't stated the

  That was one of the first (if not the first) entry added to the Q&T page:

http://tag.povray.org/povQandT/languageQandT.html#maxtracelevel

-- 
#macro M(A,N,D,L)plane{-z,-9pigment{mandel L*9translate N color_map{[0rgb x]
[1rgb 9]}scale<D,D*3D>*1e3}rotate y*A*8}#end M(-3<1.206434.28623>70,7)M(
-1<.7438.1795>1,20)M(1<.77595.13699>30,20)M(3<.75923.07145>80,99)// - Warp -

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