On 09/16/2012 01:20 PM, Alain wrote:

>> Struggling a bit to light my amethyst ring (posted in p.b.images) and
>> decided to try a light_group. I have:
>>
>> union {
>>    light_group {
>>      object { Stone material { StoneMaterial } hollow on }
>>      light_source { Stone_Light }
>>      #if (UsePhotons)
>>        photons {target reflection on refraction on collect off }
>>      #end
>>      global_lights off
>>      }
>>    object { Band material { BandMaterial }
>>    }
>>
>> The stone light has reflection/refraction set to on and the scene light
>> has them turned off, but I get: Photon Warning: Could not save photon
>> map - no photons!
>>
>> Is this even possible, or am I on a fools errand?
>
> How can you shoot protons to the light_source?

LOL ... frustrated and snagged wrong example.

> I think that you should put the photons block with the Stone object and
> have none for the actual light_source. The light will use the default
> photons setting where both reflection and refraction are enabled.

Already tried that incantation. Still think photons and light_group is a 
no go. I'll prepare a better example when I get a chance.

> By the way, unless your stone contains some media, the hollow attribute
> is useless.

poseray did that just didn't bother removing it

>
>
> Alain

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