POV-Ray : Newsgroups : povray.unofficial.patches : Bug in photon patch? Server Time
2 Nov 2024 17:21:29 EDT (-0400)
  Bug in photon patch? (Message 1 to 2 of 2)  
From: Nieminen Mika
Subject: Bug in photon patch?
Date: 7 Jul 1999 01:33:04
Message: <3782e690@news.povray.org>
Why the caustics is red? Is it a bug or what?
  Sorry about the size of the example, but I couldn't get it any smaller.

  (The scene uses photons.inc described in my previous article)

---------------------------------------------------------------------------

#declare phd=3;
#include "photons.inc"

global_settings { max_trace_level 7 }

camera { location -z*30+y*5 look_at x*2 angle 35 }
light_source { -x*200+y*100, 1 spotlight point_at 0 radius 2 falloff 3 }
light_source { <100,60,-200>, .4 Photons(no,no,no) }

plane { y,-6 pigment { checker rgb 1, rgb .7 scale 10 } }
plane { -z,-60 pigment { checker rgb 1, rgb .7 scale 10 } }
union
{ cylinder { -y*5, -y*6, 2.8 }
  cylinder { -y*5.5, -y*6, 3.5 }
  pigment { rgb <1,.8,.2> }
}

merge
{ difference
  { cylinder { -y*4.9999, y*5, 2.5 }
    union
    { cylinder { -y*4, y*5.01, 2 }
      torus { 1.5, .5 translate -y*4 }
      cylinder { -y*3, -y*4.5, 1.5 }
    }
  }
  torus { 2.25, .25 translate y*5 }
  pigment { rgbf <1,1,1,.95> }
  finish { phong .5 reflection .2 }
  interior { ior 1.5 }
  Photons(yes,yes,yes)
}

merge
{ cylinder { -y*4, y*4.00001, 2.00001 }
  torus { 1.5, .50001 translate -y*4.00001 }
  cylinder { -y*3, -y*4.50001, 1.5 }
  pigment { rgbf <.9,1,1,.9> }
  finish { phong .5 reflection .1 }
  interior { ior 1.33 }
  Photons(yes,yes,yes)
}

---------------------------------------------------------------------------

-- 
main(i,_){for(_?--i,main(i+2,"FhhQHFIJD|FQTITFN]zRFHhhTBFHhhTBFysdB"[i]
):5;i&&_>1;printf("%s",_-70?_&1?"[]":" ":(_=0,"\n")),_/=2);} /*- Warp -*/


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From: Nathan Kopp
Subject: Re: Bug in photon patch?
Date: 8 Jul 1999 01:12:05
Message: <37843214.560B27D7@Kopp.com>
Yes, it looks like there is a bug.  The bug appears to be in the automatic
computation of an internal variable (which sets the range of intensities
for photons).  You can override this automatic computation with the
following line (as a temporary workaround):

global_settings{photons{range_divider 2048}}

-Nathan

Nieminen Mika wrote:
> 
>   Why the caustics is red? Is it a bug or what?
>   Sorry about the size of the example, but I couldn't get it any smaller.
> 
[scene clipped]


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