Le_Forgeron <jgr### [at] freefr> wrote:

> you need photons !

Yes, apparently one does.

I added
 photons{
  target
  reflection on
  refraction off
  }

after the finish block, and

 photons {
  count 20000
  autostop 0
  jitter 0.4
 }

to the global_settings block, and I got a faint square.
bumping up the light_source to rgb 10 made it more visible, so presumably using
a higher count or spacing will yield a similar effect, though at a slower render
speed.

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