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hello,
i have an issue using photons on one scene.
i get this error :
"Possible Photon Error: Photon map for media is empty."
excerpts from the source :
#declare usePhotons = true;
...
...
global_settings {
assumed_gamma 1.80
max_trace_level 32
#if (usePhotons)
photons {
#if (file_exists(photonFile))
load_file photonFile
#else
count 1000000
autostop 0
jitter 0.20
save_file photonFile
#end
}
#end
}
...
...
light_source {
p2r(30, 50, 1000,false)
color White //Wheat // White
#if (usePhotons)
photons {
refraction on
reflection on
}
#end
}
...
...
sphere {
<0, rSphere, 0>, rSphere
translate <xIndex,0,zIndex>*2*rSphere
translate index*deltaY*y
translate index*<1,0,1>*rSphere
material { materialVerre }
#if (usePhotons)
photons {
target
refraction on
reflection on
collect off
}
#end
}
who can help me find my error ?
thanks
---
Kurtz le pirate
Compagnie de la Banquise
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Am 02.09.2014 11:04, schrieb kurtz le pirate:
>
> hello,
>
> i have an issue using photons on one scene.
>
> i get this error :
> "Possible Photon Error: Photon map for media is empty."
It's only a "possible" error. IIRC it means that you have some interior
media (probably in "materialVerre") and POV-Ray for some reason thinks
you would want caustics to show within the media, but finds that after
photon shooting no photons have hit the media.
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>
> hello,
>
> i have an issue using photons on one scene.
>
> i get this error :
> "Possible Photon Error: Photon map for media is empty."
>
>
>
> excerpts from the source :
>
> #declare usePhotons = true;
> ...
> ...
> global_settings {
> assumed_gamma 1.80
> max_trace_level 32
> #if (usePhotons)
> photons {
> #if (file_exists(photonFile))
> load_file photonFile
> #else
> count 1000000
> autostop 0
> jitter 0.20
> save_file photonFile
> #end
> }
> #end
> }
> ...
> ...
> light_source {
> p2r(30, 50, 1000,false)
> color White //Wheat // White
> #if (usePhotons)
> photons {
> refraction on
> reflection on
> }
> #end
> }
> ...
> ...
> sphere {
> <0, rSphere, 0>, rSphere
> translate <xIndex,0,zIndex>*2*rSphere
> translate index*deltaY*y
> translate index*<1,0,1>*rSphere
> material { materialVerre }
> #if (usePhotons)
> photons {
> target
> refraction on
> reflection on
> collect off
> }
> #end
> }
>
>
>
> who can help me find my error ?
> thanks
>
>
> ---
> Kurtz le pirate
> Compagnie de la Banquise
I've found that this message can show when you save photons for later
use and there is NO media in the scene. In my case, there was fog but no
proper media.
I suspect that it can also appen if there is no media and no fog.
A little hint:
You don't need to add any photon block to your light_source unless you
want to use photons{ area_light }.
The default photons block for all light_source, except shadowless, is:
photons{ reflection on refraction on area_light off}
Also, having a photons block when photons is not activated in the
global_settings block don't have any effect. So, the
#if (usePhotons)...#end have no real use outside of the
global_settings{...} block.
Alain
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>
> hello,
>
> i have an issue using photons on one scene.
>
> i get this error :
> "Possible Photon Error: Photon map for media is empty."
> ...
> ...
clipa, alain, thanks for your light :)
---
Kurtz le pirate
Compagnie de la Banquise
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