Alain Martel <kua### [at] videotronca> wrote:

> > 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.

Ah, thanks.  I had pulled the light source for the bulbs from the LightSys code
which uses adaptive 1.  Using adaptive 0 it does seem to be rendering more
quickly.  I took your suggestion of using 17x17, made it circular and used
orient as well.

-- Chris R.
-- Happily rendering since 2014

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