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/*
OK - here's the source to my 'Hazy Days ...' picture - my first attempt
to use media for atmospheric effects.
Enjoy!
Mike Andrews.
*/
#include "colors.inc"
global_settings { assumed_gamma 1.0 }
background { color red 0.1 green 0.3 blue 0.8 }
#declare camLookAt = <0, 100, 0>;
#declare camLoc = <10, 2, -250>;
#declare lightDist = 10000;
#declare lightRad = sin(radians(0.5))*lightDist;
#declare lightPos = vnormalize(camLookAt*3 - camLoc) * lightDist;
camera {
location camLoc
direction <0, 0, 1.0>
look_at camLookAt
}
// set up light source somewhere to right-top of image
light_source {
0*x color White
media_attenuation on
looks_like {
sphere { 0, lightRad
pigment { White }
finish { ambient 1 diffuse 0 }
}
}
translate lightPos
rotate 50*y
}
// ground sphere
sphere { 0, 1 scale 15000 translate -15000*y
pigment { colour Wheat }
}
// container for atmosphere - keeps it only below the clouds
sphere { 0, 1
pigment { rgbf 1
}
finish { ambient 0 diffuse 0 }
interior {
media {
intervals 10
scattering {
4, rgb <0.004, 0.005, 0.007>
extinction 1.0
}
samples 1, 10
confidence 0.9999
variance 1/1000
}
}
hollow
scale 15099.99
translate -15000*y
}
// density variation at centre of clouds
#declare D_Cloud_Center = density {
spotted triangle_wave
colour_map {
[0.0 colour Gray75]
[1.0 colour Gray25]
}
}
// density variation at edges of clouds
#declare D_Cloud_Edge = density {
spotted triangle_wave
colour_map {
[0.0 colour Gray50]
[1.0 colour Gray05]
}
}
// container for clouds
difference {
sphere { 0, 1 scale 15115 hollow }
sphere { 0, 1 scale 15100 hollow }
pigment { colour rgbf 1.0 }
finish { ambient 0 diffuse 0 }
interior {
media {
intervals 10
scattering { 2, rgb 1.0 }
samples 1, 10
confidence 0.9999
variance 1/1000
// set density for flat bases, taller tops
density {
onion
#declare cloudDepth = 15 / 15100;
colour_map {
[0 colour Black]
[0.2 * cloudDepth colour White]
[cloudDepth colour Black]
}
scale 15100
}
// define the basic cloud shapes
density {
spotted triangle_wave
colour_map {
[0.3 colour White]
[0.7 colour Gray05]
}
scale 2.5 * 15
}
// define large 'cells' in the clouds
density {
spotted triangle_wave
density_map {
[0.0 D_Cloud_Center scale 0.2]
[0.5 D_Cloud_Edge scale 0.2]
}
scale 2.5 * 15
}
// define small scale variation
density {
spotted triangle_wave
density_map {
[0.0 D_Cloud_Edge scale 0.08]
[0.5 D_Cloud_Edge scale 0.08]
}
scale 2.5 * 15
}
}
}
translate -15000*y
hollow
}
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