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Why does the light beam not fade away with distance?
varying fade_power and distance seems to vary the light evenly along the
beam.
Mick
#version 3.1;
#include "colors.inc"
global_settings
{
assumed_gamma 1.0
}
// ----------------------------------------
camera
{ location <0.0, -10, 95.0>
direction 1.5*z
up 4/3*y
right <1,0,0>
look_at <0.0, 0.0, 0.0>
}
light_source{ <0, 200, 0>
// color rgb 1.0
arealight<8, 0, 0> <0, 0, 8> 4, 4
adaptive 0
jitter
media_interaction off
// create a point "spotlight" (cylindrical directed) light source
light_source
{
0*x // light's position (translated below)
color rgb <1,1,1> // light's color
spotlight // this kind of light source
cylinder // this variation
translate <90, 180, -40> // <x y z> position of light
point_at <0, 0, 30> // direction of spotlight
radius 50 // hotspot (inner, in degrees)
tightness 150 // tightness of falloff (1...100) lower is
softer, higher is tighter
falloff 50 // intensity falloff radius (outer, in degrees)
fade_distance 40
fade_power 1
media_attenuation on
}
box{<-100,-100,100><100,200,-100> pigment{Blue}hollow
interior{
media{
scattering{1, .2 extinction .01}
samples 20, 100
intervals 10
ratio .999
confidence .9
variance 1/1000
}
}
}
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