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Cousin Ricky <ric### [at] yahoocom> wrote:
> > Beside this philosophical reasons it was important for me in a more technical
> > sense as it is the first image since 15 years developed with assumed_gamma 1.
> > I think, I'll stay at this since it is obviously possible to realize strong
> > contrasts with assumed_gamma 1...
>
> I would expect so. Real life does it linearly; it is our perceptions
> that are non-linear. My response to a low contrast scene has not been
> to fiddle with the assumed gamma, but to change the lighting environment.
In fact texturing was really simple. A finish like "specular 0.3 roughness 0.003
diffuse 0.6 ambient 0" worked with nearly all objects. When I used assumed_gamma
2.2 there was much more work to do :-)
The biggest change was to reduce the radiosity contribution of the sky.
Here I used rather extreme settings (at least for me) -
#version 3.7;
#declare RAD = 8;
global_settings {
assumed_gamma 1
max_trace_level 255
noise_generator 2
radiosity {
pretrace_start 0.08
pretrace_end 0.04/RAD
count 30*RAD
nearest_count min (20, RAD)
error_bound 3/RAD
low_error_factor 0.5
recursion_limit 1
gray_threshold 0
minimum_reuse 0.015
brightness 1
adc_bailout 0.005
normal on
media off
}
}
#declare skyf = 0.5;
light_source {
<0,0,40000> color srgb (<2.42,2.23,1.87>+2.173*0.3)*0.85
area_light <1000,0,0>, <0,1000,0> 5,5 adaptive 0 jitter circular orient
rotate <-47,-50,0>
}
sky_sphere {
pigment {
function {max (min (y, 1), 0)}
color_map {
[0.0000 srgb <212*skyf,221*skyf,239*(1+skyf)*0.5>/255]
[0.1029 srgb <219*skyf,229*skyf,244*(1+skyf)*0.5>/255]
[0.1512 srgb <233*skyf,241*skyf,250*(1+skyf)*0.5>/255]
[0.1949 srgb <223*skyf,239*skyf,252*(1+skyf)*0.5>/255]
[0.2444 srgb <201*skyf,227*skyf,252*(1+skyf)*0.5>/255]
[0.2921 srgb <180*skyf,213*skyf,250*(1+skyf)*0.5>/255]
[0.3732 srgb <144*skyf,180*skyf,239*(1+skyf)*0.5>/255]
[0.4255 srgb <137*skyf,172*skyf,235*(1+skyf)*0.5>/255]
[0.7067 srgb < 97*skyf,126*skyf,198*(1+skyf)*0.5>/255]
[0.7740 srgb < 92*skyf,119*skyf,190*(1+skyf)*0.5>/255]
[0.8275 srgb < 88*skyf,114*skyf,185*(1+skyf)*0.5>/255]
[0.8850 srgb < 85*skyf,111*skyf,180*(1+skyf)*0.5>/255]
[0.9425 srgb < 82*skyf,107*skyf,175*(1+skyf)*0.5>/255]
[1.0000 srgb < 79*skyf,103*skyf,170*(1+skyf)*0.5>/255]
}
}
}
Norbert
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