POV-Ray : Newsgroups : povray.general : Dispersion+photons problem Server Time
18 Nov 2024 03:15:33 EST (-0500)
  Dispersion+photons problem (Message 1 to 3 of 3)  
From: Rafal 'Raf256' Maj
Subject: Dispersion+photons problem
Date: 2 Nov 2002 00:34:18
Message: <Xns92BA421E8F1FDraf256com@204.213.191.226>
Hello,
some time ago I warned about possible bug in photons/dispersion code. Now, 
I confirmed bug (on another computer), so maybe it's worth further 
inwestigation ?

Sometimes in scenes using photns + dispersion, dispersion settings are 
ignored (and after re-rendering scene with SAME .pov file - sometimes it is 
rendered o.k., and sometimes - without dispersion).

Details are here :
  http://raf256.com/pov/bug?id=1

-- 
#macro g(U,V)(.4*abs(sin(9*sqrt(pow(x-U,2)+pow(y-V,2))))*pow(1-min(1,(sqrt(
pow(x-U,2)+pow(y-V,2))*.3)),2)+.9)#end#macro p(c)#if(c>1)#local l=mod(c,100
);g(2*div(l,10)-8,2*mod(l,10)-8)*p(div(c,100))#else 1#end#end light_source{
y 2}sphere{z*20 9pigment{function{p(26252423)*p(36455644)*p(66656463)}}}//M


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From: Ken
Subject: Re: Dispersion+photons problem
Date: 2 Nov 2002 02:00:22
Message: <3DC377D6.A63DF796@pacbell.net>
Rafal 'Raf256' Maj wrote:
> 
> Hello,
> some time ago I warned about possible bug in photons/dispersion code. Now,
> I confirmed bug (on another computer), so maybe it's worth further
> inwestigation ?
> 
> Sometimes in scenes using photns + dispersion, dispersion settings are
> ignored (and after re-rendering scene with SAME .pov file - sometimes it is
> rendered o.k., and sometimes - without dispersion).
> 
> Details are here :
>   http://raf256.com/pov/bug?id=1

That is the shortest possible code you could come up with that will produce
the problem !?!

-- 
Ken Tyler


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From: Rafal 'Raf256' Maj
Subject: Re: Dispersion+photons problem
Date: 2 Nov 2002 04:34:02
Message: <Xns92BA6AC3FDA1Eraf256com@204.213.191.226>
Ken <tyl### [at] pacbellnet> wrote in news:3DC377D6.A63DF796@pacbell.net

> 
> 
> Rafal 'Raf256' Maj wrote:
>> 
>> Hello,
>> some time ago I warned about possible bug in photons/dispersion code.
>> Now, I confirmed bug (on another computer), so maybe it's worth
>> further inwestigation ?
>> 
>> Sometimes in scenes using photns + dispersion, dispersion settings
>> are ignored (and after re-rendering scene with SAME .pov file -
>> sometimes it is rendered o.k., and sometimes - without dispersion).
>> 
>> Details are here :
>>   http://raf256.com/pov/bug?id=1
> 
> That is the shortest possible code you could come up with that will
> produce the problem !?!

no, this is mentioned as to do item :) but genraly - *any* scene with
- photons
- dispersion
- sphere
- plabne

-- 
#macro g(U,V)(.4*abs(sin(9*sqrt(pow(x-U,2)+pow(y-V,2))))*pow(1-min(1,(sqrt(
pow(x-U,2)+pow(y-V,2))*.3)),2)+.9)#end#macro p(c)#if(c>1)#local l=mod(c,100
);g(2*div(l,10)-8,2*mod(l,10)-8)*p(div(c,100))#else 1#end#end light_source{
y 2}sphere{z*20 9pigment{function{p(26252423)*p(36455644)*p(66656463)}}}//M


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