Insert this into every object's finish:

 #if (full_ambient > 0)
  ambient 1 diffuse 0
 #end

And, at the beginning of your scene file:

 #declare full_ambient=0;

When you want to set everything to superbright, set full_ambient to 1.

.....Chambers

PS After thinking a little, instead of setting diffuse to 0, you could put
every light into another conditional and just turn them off (to speed up
rendering).

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Chambers <bdc### [at] yahoocom> wrote:
> Insert this into every object's finish:

>  #if (full_ambient > 0)
>   ambient 1 diffuse 0
>  #end

  That's only necessary for object which already have some ambient and
diffuse defined (which is quite seldom the case). For objects which do
not have anything defined it's enough to put something like this at
the beginning of the scene:

#default { finish { ambient 1 diffuse 0 } }

-- 
#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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