Am 09.08.2022 um 17:16 schrieb William F Pokorny:
> On 8/9/22 10:50, Thomas de Groot wrote:
>> Op 9-8-2022 om 14:53 schreef Thomas de Groot:
>>> initially, I wanted to concentrate on the hdr light sources though...
>>>
>> ...and when I do, no photons are generated!
>>
>> I use
>>    photons {
>>      refraction on
>>      reflection on
>>    }
>>
>> for the sphere with the hdr map, identical to the code for the light 
>> source. Decreasing spacing down to a ridiculously small value doesn't 
>> change anything. I must be missing something here...
>>
> 
> I'm perhaps not following, but...
> 
> Taking your hdr sphere to be an actual hollow sphere, you are making it 
> a photon target for any photon light sources by adding the photon block 
> above. In other words - as far as I know - there is no way to shoot 
> photons from other than a traditional light sources.
> 
> Aside: I've never tried to shoot photons from a light source inside a 
> hollow object at the inside surface of that object. I'm not sure it 
> would work given the how the radial 'shooting pattern' is aimed at 
> target objects. Perhaps this the reason why you get no photons? Hmm, 
> maybe a spot light would work... Too long since I've played with photons.
> 
> Bill P.
Unfortunatelly, Bill seems to be right. I tried a bit, but it seems to 
be impossible to persuade a HDRI light to cast photons, so we need POV 
4.0 ;)

Best regards,
Michael

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