Le 2023-12-05 à 08:42, Chris R a écrit :
> I have gone back to working on poor Cogito in his cell.  In this new version, I
> think he has a lot more character due to adding more grime and rust to his body,
> and placing the rust in more strategic places.  The dark brown streakiness on
> his back and head are from accumulated grime mixed with dripping water from the
> ceiling.  I have placed a ring of rust around his eyes and mouth as those would
> be places where the metal had been cut and would be more susceptible to rusting.
> 
> In general, all of his body has been un-shined.
> 
> In addition, I did a fair amount of work on the walls of the cell.  The stones
> are now much rougher, and I added grime of many colors in a gradient from the
> floor to the ceiling.  There is some reflection as well where the walls are wet.
> 
> There are some streams of dripping water from the ceiling as well.
> 
> The floor was modified slightly, but I haven't done enough work making it as
> dirty as the walls, so that's probably the next task.
> 
> This version was done without radiosity and with moderate anti-aliasing.  I
> tried rendering with radiosity and a higher degree of anti-aliasing and found
> that it took 8 hours to do the first radiosity pass, so I abandoned that.  I
> later realized that the two light bulbs in the scene (one in the cell, one
> behind the camera) were set up as 3x3 area lights, so the scene had 18+ light
> sources.  I put those back to single-lights and the render took about 24 hours,
> so I can probably add in radiosity again later.
> 
> -- Chris R.
> -- Happily rendering since 2014

3x3 area_light is small. Do you use adaptive ?

Use the same lights, increase the area_light to something like 17x17, 
and use adaptive 0.

Thar way, only 4 samples per light will be used for much of the scene. 
Given the composition, the risk of having artifacts is pretty low.

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