"Kenneth" <kdw### [at] gmailcom> wrote:
> I can't even begin to imagine how many test renders you had to make, to get to
> this final result. I would probably be at the task for years :-O


not too much test renders - I saved about 50 individual ones - so I made perhaps
3-400 test renders at all - together with with the individual renders for the
ca. 50 objects.
This is my usual number I guess - but this image took more than 7 months to let
me an ok - and I needed some months of them to get rid of a certain (povray)
flaw.

Here I show the basic scene (without ceiling). Combination of strong light and
strong normals cause an effect like double_illuminate - here is a minimal scene
too.

#version 3.7;

global_settings {
        assumed_gamma 1
        radiosity {
                pretrace_start 0.08
                pretrace_end 0.01
                count 120
                nearest_count 4
                error_bound 0.5
                low_error_factor 0.5
                recursion_limit 2
                gray_threshold 0
                minimum_reuse 0.015
                brightness 1
                adc_bailout 0.005
                normal on
        }
}

#include "stdinc.inc"

camera {
        right x*image_width/image_height
        location <10,100,20>
        look_at <-27,57,38>
        angle 48
}

background {color srgb 1}

light_source {<-800,5000,7500>, color srgb 5.6} // a strong light is essential

union {                                         // an arrow showing direction of
incoming light (from the right and slightly behind)
        cylinder {3*y, 15*y, 0.75}
        cone {0, 0, 3*y, 1.2}
        texture {
                pigment {color srgb x}
                finish {ambient 0 diffuse 1 specular 0.3 roughness 0.1
reflection 0.15}
        }
        Point_At_Trans (<-800,5000,7500>)
        translate (<-40.8,10,27>+<-56,89,84>)/2
}

//_____________________________________________ scene

#declare T1 =
texture {
        pigment {color srgb 0.2}
        finish {diffuse 0.6 ambient 0}
        normal {granite 5 scale 0.01}           // a strong normal is essential
too
}

union {
        triangle {0, y, z+y}
        triangle {0, z, z+y}
        texture {T1}
        scale <1,543,514>*0.1
        translate <-40.8,0,27>
}

union {
        triangle {0, y, z+y}
        triangle {0, z, z+y}
        texture {T1}
        scale <1,543,514>*0.1
        translate <-42.8,0,27>
}

#if (0)                                         // if turned off, strange
behavior occurs (like double_illuminate)
        box {
                <-40.8,0,78>, <-56,89,84>
                pigment {color srgb <0,0,1>}
        }
#end


Norbert

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