I thought I'd give Jadzia's image a try.  I did include a mirror: a 
glass plate with aluminum backing.

Elapsed time was 15.5 hours.  Here are some stats:

Number of photons shot:        78466522
Surface photons stored:         1060010
Gather function called:        51789326

Render Time:
   Photon Time:     11 hours 34 minutes 58 seconds (41698.012 seconds)
               using 11 thread(s) with 164250.003 CPU-seconds total
   Radiosity Time:   0 hours  4 minutes  2 seconds (242.569 seconds)
               using 8 thread(s) with 1918.047 CPU-seconds total
   Trace Time:       3 hours 51 minutes 53 seconds (13913.227 seconds)
               using 8 thread(s) with 108057.917 CPU-seconds total

Most of that time was photons interacting with the mirror, and that even 
by using photons { target 5 }.  Based on draft runs, I estimate that 
about 10 of the 11.6 photons hours was just the mirror.  But some 
caustics from the mirror are visible on the walls, so I kept the mirror 
as a photons target.

Attachment: cube_of_cubes.jpg

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Le 18-04-19 à 20:35, Cousin Ricky a écrit :
> I thought I'd give Jadzia's image a try.  I did include a mirror: a 
> glass plate with aluminum backing.
> 
> Elapsed time was 15.5 hours.  Here are some stats:
> 
> Number of photons shot:        78466522
> Surface photons stored:         1060010
> Gather function called:        51789326
> 
> Render Time:
>    Photon Time:     11 hours 34 minutes 58 seconds (41698.012 seconds)
>                using 11 thread(s) with 164250.003 CPU-seconds total
>    Radiosity Time:   0 hours  4 minutes  2 seconds (242.569 seconds)
>                using 8 thread(s) with 1918.047 CPU-seconds total
>    Trace Time:       3 hours 51 minutes 53 seconds (13913.227 seconds)
>                using 8 thread(s) with 108057.917 CPU-seconds total
> 
> Most of that time was photons interacting with the mirror, and that even 
> by using photons { target 5 }.  Based on draft runs, I estimate that 
> about 10 of the 11.6 photons hours was just the mirror.  But some 
> caustics from the mirror are visible on the walls, so I kept the mirror 
> as a photons target.
> 
> Attachment: cube_of_cubes.jpg

For those mirrors, you could save a lot of photons time by using copies 
of the mirrors as projected through objects with lights mirrored 
relative to the mirrors. Don't forget to remove the protons{target} from 
the mirrors. The mirrors will still reflect any secondary photons they 
receive.

Another photons trick : For the inner cubes, don't set them as target. 
The photons shoot at them are lost because they are intercepted by the 
outer cubes. Have at most two layers of your cubes set as target.

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On 04/19/2018 10:44 PM, Alain wrote:
> For those mirrors, you could save a lot of photons time by using copies
> of the mirrors as projected through objects with lights mirrored
> relative to the mirrors. Don't forget to remove the protons{target} from
> the mirrors. The mirrors will still reflect any secondary photons they
> receive.

There is only one mirror in this scene.

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Without responding to the questions raised, i just want to say that the
render result is very beautiful. It inspires me to use something like
that for the outside of a skyscraper, each small cube being a two-floor
family home, and each one-floor distance in between two of those cubes
being used as a shopping and socializing floor maybe. Ideas...

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