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Thank you all again. I have incorporated a custom function to work around
POV-Ray 3.6.1's radiosity bug, and to greatly improve both the quality and the
render speed. Here is what I've settled on for now, while I render it from
various angles to get a better sense of it:
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// Copyright (C) 2011 by Peter Markley.
#local sun_radius = 40.00; // units in megameters
#local eith_orbt_rdus = 3000.00; // eithalica's orbit radius
#local aphelion_offset = 20.00; // distance of ephelion from
// otherwise circular orbit
#local eith_radius = 6.53; // eithalica is the planet's name
#local eith_mass = 6.40e24; // units in kilograms
#local eith_moon_dist = 6.00; // dist @ closest point between
// eithalica's & moon's surfaces
#local eith_moon_rdus = 6.22; // moon radius
#local eith_moon_mass = 5.55e24; // moon mass
#local eith_rotn_prod = 4.70; // rotation period in hours
#local camr_dist = 3.00; // multiplier for camera dist
#local eith_poso = radians(073); // eithalica's orbital position
// in radians counterclockwise
// from positive x axis
#local eith_day = (10/(141+1))*4.70;//(frame_number/(final_frame+1))*4.70;
// eith's rotational position in
// hours - one full turn every
// multiple of 4.70
#local atmos_color = <5.4e-2,1.8e-1,3.6e-1>; // color that is reflected
//#local atmos_twilight = 1-(1-<1.0,0.7,0.4>)*1.0; // color that is transmitted
#local eith_moon_posr = eith_radius+eith_moon_dist+eith_moon_rdus;
#local eith_rotn = (eith_day/eith_rotn_prod)*-360-degrees(eith_poso);
#local eith_posx =
cos(eith_poso)*(eith_orbt_rdus+aphelion_offset*0.5)-aphelion_offset*0.5;
#local eith_posz = sin(eith_poso)*eith_orbt_rdus;
camera
{
location <0,1,-0.1>*(eith_moon_posr+eith_moon_rdus)*(camr_dist+1.0) look_at 0
right x*image_width/image_height
rotate <0,eith_rotn,0>
translate <eith_posx,0,eith_posz>
angle 48
}
light_source
{
0 color rgb 3.0
/*looks_like
{
sphere
{
0,sun_radius
texture {pigment {rgb 5} finish {ambient 1}}
no_shadow
}
}*/
}/*
sphere
{
0,1e2
texture {pigment {rgbt <0,0,0,1>}}
no_shadow
hollow
interior
{
media
{
emission <1.0e-2,5.0e-3,7.0e-4>
intervals 1
method 3
samples 20
}
}
}*/
sky_sphere {pigment {rgb <0,0,0>}}
global_settings
{
ambient_light 1.0
radiosity {brightness 1.0 count 100 media on recursion_limit 20}
max_trace_level 15
}
#default {finish {ambient 0.0 diffuse 1.0}}
/*torus {eith_orbt_rdus,0.5 texture {pigment {rgb <1,0.3,0>} finish {ambient
1}}}
torus
{
eith_orbt_rdus,0.5 texture {pigment {rgb <1,1,0>} finish {ambient 1}}
scale <(aphelion_offset*0.5+eith_orbt_rdus)/eith_orbt_rdus,1,1>
translate <-aphelion_offset*0.5,0,0>
}*/
#local eith_texture = texture
{
pigment {rgb <0,0,0.4>}
finish {specular 0.7}
normal {agate scale 1e-3}
};
union
{
// eithalica
union
{
sphere
{
0,eith_radius texture {eith_texture}
texture {pigment {image_map {png "./eithalica_tex.png" map_type 1}}}
photons {target reflection on refraction off}
}
sphere
{
0,eith_radius+8e-2
texture {pigment {image_map {png "./eithalica_clouds.png" map_type 1}}}
photons {target reflection on refraction off}
hollow
}
}
// temalar
union
{
sphere
{
0,eith_moon_rdus texture {eith_texture}
texture {pigment {image_map {png "./temalar_tex.png" map_type 1}}}
photons {target reflection on refraction off}
}
sphere
{
0,eith_moon_rdus+8e-2
texture {pigment {image_map {png "./temalar_clouds.png" map_type 1}}}
photons {target reflection on refraction off}
hollow
}
translate <eith_moon_posr,0,0>
}
// chessol
union
{
sphere
{
0,eith_moon_rdus texture {eith_texture}
texture {pigment {image_map {png "./chessol_tex.png" map_type 1}}}
photons {target reflection on refraction off}
}
sphere
{
0,eith_moon_rdus+8e-2
texture {pigment {image_map {png "./chessol_clouds.png" map_type 1}}}
photons {target reflection on refraction off}
hollow
}
translate <eith_moon_posr,0,0>
rotate <0,-120,0>
}
// siothum
union
{
sphere
{
0,eith_moon_rdus texture {eith_texture}
texture {pigment {image_map {png "./siothum_tex.png" map_type 1}}}
photons {target reflection on refraction off}
}
sphere
{
0,eith_moon_rdus+8e-2
texture {pigment {image_map {png "./siothum_clouds.png" map_type 1}}}
photons {target reflection on refraction off}
hollow
}
translate <eith_moon_posr,0,0>
rotate <0, 120,0>
}
//torus {eith_moon_posr,0.1 texture {pigment {rgb <1,1,0>} finish {ambient 1}}}
#local mlef = -cos(radians(60))*eith_moon_posr;
#local mrht = eith_moon_posr;
#local mbot = -sin(radians(60))*eith_moon_posr;
#local mtop = +sin(radians(60))*eith_moon_posr;
//chessol = <left,0,top>;
//siothum = <left,0,bottom>;
//temalar = <right,0,0>;
#local grav = 6.6738480e-29; // universal gravitational constant in cubic
megameters per (kilogram (seconds squared))
#local maxi = 13e-6; // maximum expected acceleration in megameters per second
#local mini = 7e-6; // acceleration threshold at which atmospheric density is
zero
#local len = function(x,y,z) {sqrt(pow(x,2)+pow(y,2)+pow(z,2))}; // distance
formula
sphere
{
0,eith_moon_posr+eith_moon_rdus*1.6 texture {pigment {rgbt <0,0,0,1>}}
hollow
interior
{
media
{
scattering {2, atmos_color extinction 1.6}
density
{
average
density_map
{
[0.25 function
{
1.0-min(1,1.0-(grav*eith_mass/pow(len(x,y,z),2)+
grav*eith_moon_mass/pow(len(x-mlef,y-0.0,z-mtop),2)+
grav*eith_moon_mass/pow(len(x-mlef,y-0.0,z-mbot),2)+
grav*eith_moon_mass/pow(len(x-mrht,y-0.0,z-00.0),2)-mini)
/(maxi-mini))
}]
[1.0 function
{
(1.0-min(1,pow((sqrt(pow(x,2)+pow(y,2)+pow(z,2))-eith_radius)/(eith_radius*0.25),1/3)))+
(1.0-min(1,pow((sqrt(pow(x-mlef,2)+pow(y-0.0,2)+pow(z-mtop,2))-eith_moon_rdus)/(eith_moon_rdus*0.25),1/3)))+
(1.0-min(1,pow((sqrt(pow(x-mlef,2)+pow(y-0.0,2)+pow(z-mbot,2))-eith_moon_rdus)/(eith_moon_rdus*0.25),1/3)))+
(1.0-min(1,pow((sqrt(pow(x-mrht,2)+pow(y-0.0,2)+pow(z-00.0,2))-eith_moon_rdus)/(eith_moon_rdus*0.25),1/3)))
}]
}
}
intervals 1 method 3 samples 20
}
//fade_color atmos_twilight
//fade_distance eith_moon_rdus*2.0
//fade_power 2.0
}
}
rotate <0,eith_rotn,0>
translate <eith_posx,0,eith_posz>
}
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