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https://news.povray.org/povray.binaries.images/thread/%3C65c7ec42%40news.povray.org%3E/
Well, I found out why my 30th anniversary tribute to POV-Ray went crazy
when I upgraded the lamp fixtures: photons are broken with POV-Ray 3.8's
inverse squared lighting. I rendered my initial scene before I had
finished the DeskLamp module, and at that time, the scene used only
POV-Ray's legacy light fading; but the DeskLamp module automatically
uses true inverse squared if it detects #version 3.8 or later.
The 2 control images below were rendered without photons, just to verify
that the legacy light source and true inverse squared light source are
comparable.
---%<----%<----%<----%<--[BEGIN CODE]--%<----%<----%<----%<----%<---
// +KFF4 +W512 +H384
#version 3.8;
#declare Has_photons = (frame_number >= 3);
#declare True_invsq = 1 - mod (frame_number, 2);
#include "screen.inc"
global_settings
{ assumed_gamma 1
max_trace_level 100
#if (Has_photons)
photons { spacing 0.005 autostop 0 }
#end
}
#default { finish { ambient 0.1 diffuse 0.6 emission 0 } }
box
{ -<6, 0.001, 6>, <6, 8, 6>
hollow
pigment { rgb 1 }
}
Set_Camera (<2, 3, -5>, <0.25, 1, 0>, 60)
#declare v_Source = <-5, 7, -5>;
#declare v_Focus = <0, 1, 0>;
#declare Dist = vlength (v_Source - v_Focus);
#if (True_invsq)
light_source
{ v_Source, rgb pow (Dist, 2)
fade_distance 0
fade_power 2
}
#else
#declare FD = 0.1;
light_source
{ v_Source, rgb (1 + pow (Dist / FD, 2)) / 2
fade_distance FD
fade_power 2
}
#end
intersection
{ box { -1, 1 }
box { -1.1, 1.1 rotate 45 * x }
box { -1.1, 1.1 rotate 45 * y }
box { -1.1, 1.1 rotate 45 * z }
translate y
pigment { rgbf 1 }
finish
{ fresnel 1
reflection { 1 fresnel } conserve_energy
specular 1 roughness 0.0003
}
interior { ior 1.8 dispersion 1.04 }
photons { target collect off reflection on refraction on }
}
Screen_Object
( text
{ ttf "cyrvetic"
concat
( #if (True_invsq) "True inverse squared",
#else "Old fade formula",
#end
#if (Has_photons) " with photons"
#else " control"
#end
)
0.001, 0
pigment { rgb 0 }
scale 16 / image_height
},
<0, 0>, <0.02, 0.01>, yes, 1
)
--->%---->%---->%---->%---[END CODE]--->%---->%---->%---->%----%<---
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Attachments:
Download 'invsq_photons1.jpg' (19 KB)
Download 'invsq_photons2.jpg' (19 KB)
Download 'invsq_photons3.jpg' (26 KB)
Download 'invsq_photons4.jpg' (37 KB)
Preview of image 'invsq_photons1.jpg'
Preview of image 'invsq_photons2.jpg'
Preview of image 'invsq_photons3.jpg'
Preview of image 'invsq_photons4.jpg'
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