> some time away from pov, back to basics.  Rendered under ancient 3.6 and 
> the old radiosity...
> 
> 
> #include "colors.inc"
> 
> background { rgb 0 }
> 
> #default {finish {ambient 0 diffuse .6}}
Set default ambient to zero.
> global_settings {
>     ambient_light 0
KILL any and all ambient from all finishes.
>     radiosity { brightness 1.4 count 256*4 pretrace_end .006 error_bound 
> .2 }
> }
> 
> camera { location <-7, 4, -8> look_at 0
>    angle 60
>    focal_point y blur_samples 30*5 aperture .3 variance 0 confidence 1
> }
> 
> // main light source and radiosity equivalent
> light_source { 30*<1,1,-1> White/1 area_light 3*x,3*y,3,3 circular jitter }
If you use adaptive 0 or adaptive 1, you can use 3*x,3*y,129,129 and 
have a barely slower render time.

> box { -3/2,3/2 scale z/10 scale 7
>     pigment { rgb 1 } finish { ambient 10 diffuse 1 }
With ambient_light 0, ambient 10 = ambient 0
>     translate -z*70 rotate <45,-45> no_reflection
> }
> 
> // backlight
> light_source { 9*<-2,2,5> rgb <1,1,.7>*.8 shadowless }
> 
> 
> plane { y 0 pigment { checker Black White } }
> 
> sphere { y 1 pigment { Red } }
> 
> cylinder { 0, 2*y 1 pigment { Yellow } translate 4*z rotate y*90*0 }
> box { -1,1 translate y pigment { Magenta } translate 4*z rotate y*90*1 }
> cone { 0, 1, 2*y, 0 pigment { Orange } translate 4*z rotate y*90*2 }
> torus { 1,.5 translate y*.5/2 pigment { Green } translate 4*z rotate 
> y*90*3 }
> 
> ------------------------------------------------------------------------
> 
You set the default ambient to zero in the #default statement.

Then, you set ambient_light 0 in the global settings.
With that, you can't use your ambient box as a light source, as it's 
ambient component gets multiplied by zero. 10 * 0 = 0.


Alain

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