Thanks, Alain, your tips are always worthwhile.  Specially for someone
restarting -- gosh, ambient_light 0 really atrocious.  I remember a tip you
gave about another adaptive setting in another context that also worked
marvelous.

This time with sole box as light source, as well as still the shadowless
backlight... in 3.6.  Next, I'm trying 3.7 to see how this fares on clipka's
radiosity changes... :)


#include "colors.inc"

background { rgb 0 }

#default {finish {ambient 0 diffuse .6}}
global_settings {
 ambient_light .06
 radiosity { brightness 1.2 count 256*4 pretrace_end .006 error_bound .2*2 }
}

//camera { location <-2, 4, -9> look_at 0
camera { location <-7, 4, -8> look_at 0
   angle 60
   //focal_point y blur_samples 30*5 aperture .3 variance 0 confidence 1
}

//light_source { 30*<1,1,-1> White/1 area_light 3*x,3*y,30,30 circular jitter
adaptive 1 }
box { -3/2,3/2 scale z/10 scale 7 pigment { rgb 1 } finish { ambient 800 diffuse
1 }
 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 } clipped_by {cylinder{-y,y 20}} }

sphere { y 1 pigment { Red } }

#macro foo( tr, rt )
 translate tr rotate rt translate -1*tr
#end

cylinder { 0, 2*y 1 pigment { Yellow } foo( -z, x*30-y*45 ) 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 }

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