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Alain Martel <kua### [at] videotron ca> wrote:
> When using area_light you should always use adaptive.
> The PRESENCE of adaptive turn the feature on. adaptive 0 DO NOT turn it off.
>
> adaptive 0 start with 4 samples (2 by 2): One at each corners.
> adaptive 1 start with 9 samples (3 by 3): Each corners plus one in the
> middle of each side and the center.
> adaptive 2 start with 25 samples (5 by 5), adaptive 3 with 81 (9 by 9),...
>
> This allow you to use something like this :
>
> area_light 3*x 3*z 1025 1025 adaptive 0
>
> and still have reasonably quick renders with no discernible banding,
> even without jitter.
The details of how area_light actually works is a bit murky to those of us who
don't use it enough or have investigated it in a string of experimental renders
or reading the source code.
In any event, I'm sure Alain isn't suggesting using a million lights.
Due to however area_light works, that 3x3 patch might get split up into a grid
of a million squares - but it doesn't take the same amount of time to render as
a million separate point lights.
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