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Here's the programming language used to render the image I'm posting. Notice
there are no rainbow-style effects refracting onto the ground. How do I get
proper refraction?
#include "colors.inc"
#include "textures.inc"
#include "finish.inc"
#include "glass.inc"
global_settings {
max_trace_level 12
photons {
count 100000
spacing .01
autostop 0
jitter .2
}
}
camera {
location <0,7.5,-10>
look_at 0
}
light_source {<1000,1000,-1000>rgb<1,1,1>
photons {refraction on
reflection on}
}
background {rgb<.7,.7,1>}
plane {<0,1,0>,-1
pigment {rgb<.5,.5,.5>
}
finish {ambient 1}
photons {collect off}
}
sphere {<5,1,0>,2
texture {T_Old_Glass}
finish {ambient 0
diffuse .5
reflection .25
} interior {ior 1.5
dispersion 1
caustics .25
fade_distance .25
fade_power .25}
photons {
target 1
refraction on
reflection off
}
cylinder {<-3,0,0>,<-3,4,0>,1
texture {T_Old_Glass}
finish {ambient 0
diffuse .5
reflection .25}
interior {ior 1.5
dispersion 1.1
caustics .25
fade_distance .25
fade_power .25
photons {target 1
refraction on
reflection off
}
}
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Attachments:
Download 'prism problem.jpg' (10 KB)
Preview of image 'prism problem.jpg'
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From: Steven Pigeon
Subject: Re: Can't get photons to bring about desired refraction
Date: 6 May 2004 15:54:37
Message: <409a97fd$1@news.povray.org>
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Maybe your fade distance in your
interior is too small. Try fade distance
1.0, or more. A "natural" fade power
is 2.0, as in real life: intensity is inversely
proportionnal to the square of the distance.
Also, I think count and spacing are mutually
exclusive. I do not know which one "wins"
when both are specified.
Best,
S.
"CFM" <nomail@nomail> wrote in message
news:web.409a8149d855a4115c168f750@news.povray.org...
> Here's the programming language used to render the image I'm posting.
Notice
> there are no rainbow-style effects refracting onto the ground. How do I
get
> proper refraction?
>
> #include "colors.inc"
> #include "textures.inc"
> #include "finish.inc"
> #include "glass.inc"
> global_settings {
> max_trace_level 12
> photons {
> count 100000
> spacing .01
> autostop 0
> jitter .2
> }
> }
> camera {
> location <0,7.5,-10>
> look_at 0
> }
> light_source {<1000,1000,-1000>rgb<1,1,1>
> photons {refraction on
> reflection on}
> }
> background {rgb<.7,.7,1>}
> plane {<0,1,0>,-1
> pigment {rgb<.5,.5,.5>
> }
> finish {ambient 1}
> photons {collect off}
> }
> sphere {<5,1,0>,2
> texture {T_Old_Glass}
> finish {ambient 0
> diffuse .5
> reflection .25
> } interior {ior 1.5
> dispersion 1
> caustics .25
> fade_distance .25
> fade_power .25}
> photons {
> target 1
> refraction on
> reflection off
> }
> cylinder {<-3,0,0>,<-3,4,0>,1
> texture {T_Old_Glass}
> finish {ambient 0
> diffuse .5
> reflection .25}
> interior {ior 1.5
> dispersion 1.1
> caustics .25
> fade_distance .25
> fade_power .25
> photons {target 1
> refraction on
> reflection off
> }
> }
>
----------------------------------------------------------------------------
----
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From: Tim Nikias v2 0
Subject: Re: Can't get photons to bring about desired refraction
Date: 6 May 2004 17:31:15
Message: <409aaea3$1@news.povray.org>
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And, if I'm not mistaken, dispersion should be >1 to produce any kind of
rainbow-effect, try using 1.01 or such.
Regards,
Tim
--
"Tim Nikias v2.0"
Homepage: <http://www.nolights.de>
Post a reply to this message
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From: Alain
Subject: Re: Can't get photons to bring about desired refraction
Date: 6 May 2004 18:38:08
Message: <409abe50@news.povray.org>
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Tim Nikias v2.0 nous apporta ses lumieres ainsi en ce 2004/05/06 18:25... :
>And, if I'm not mistaken, dispersion should be >1 to produce any kind of
>rainbow-effect, try using 1.01 or such.
>
>Regards,
>Tim
>
>
>
The sphere have distersion=1 and the cylinder have dispersion=1.1.
"Natural" value goes from >1 to 1.1, but you can use about any value
!=1, even negative if you want.
Try using "dispersion_samples" with a value greater than the default of 7
||
Alain
Post a reply to this message
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