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Questions, questions...
Does increasing the photon count increase the brightness or the quality?
If photons are in the global block, but not attached to a light, is their source
distributed between all lights in the scene?
Is there any significant difference between attaching them to a light or not in
a scene with only one light?
Any general comments with regard to photons much appreciated...
--
#macro G(D,E,F)#local I=array[3]{D,E,F}#local B=0;triangle{#while(
B<3)#while(I[B])A[mod(I[B],10)]+#local I[B]=div(I[B],10);#end<-5,-
2,9>#local B=B+1;#end}#end #local A=array[7]{x,x*2,x*4,y,y*2,y*4,z
}light_source{-x*6-z*9,1}mesh{G(105,10,146)G(105,246,10)G(105,56,
146)G(105,1256,246)G(1256,126,220)G(22156,2216,201)pigment{rgb 1}}//TM
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Tom Melly wrote:
>
> Questions, questions...
>
> Does increasing the photon count increase the brightness or the quality?
A higher count will usually lead to more accurate results, meaning
caustics look less blurred. The total brighness should not differ much.
>
> If photons are in the global block, but not attached to a light, is their source
> distributed between all lights in the scene?
You must distinguish between global photons, which are very experimantal
and don't work very well in most cases IIRC, and the photons block in
global_settings{}. In global_settings{} you can set various overall
settings like count/spacing.
>
> Is there any significant difference between attaching them to a light or not in
> a scene with only one light?
I think photons are turned on for all light sources as default, so there
would be no difference, but i can't say for sure. I usually use photons{}
blocks for all light sources either with 'reflection off refraction off'
or one/both turned on.
Christoph
--
Christoph Hormann <chr### [at] gmx de>
IsoWood include, radiosity tutorial, TransSkin and other
things on: http://www.schunter.etc.tu-bs.de/~chris/
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"JRG" <jrg### [at] hotmailcom> wrote...
>
> "Nathan Kopp" <nat### [at] koppcom> ha scritto nel messaggio
> news:3b2aea14$1@news.povray.org...
> >
> > If you turn off both reflection and refraction, POV will skip that light
> > source when shooting photons (since there'd be no point).
> >
> > -Nathan
>
> But if I have many light sources in the scene, should I increase the
count?
POV totally skips the light. You don't have to try to compensate. When you
use count, POV actually tries to estimate how many photons will be
generated. POV then adjusts the overall photon spacing to try to produce
close to the count specified. (The final count is usually at least on the
same order of magnitude as the requested count.)
-Nathan
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