I've just used a little focal-blur, and I'm just curious:
How exactly does POV calculate confidence and variance
values?

I'd expect POV to shoot rays for focal-blur, but what does
it actually do to judge if the pixel-color traced so far is
probably reaalllly close to the exact color? How can
POV be "confident" about that? I guess that variance,
telling in the docs that its a tolerance on "samples taken
so far", just tells POV: "See, the most recent samples all
look pretty much the same, lets stop tracing."
At least something similiar (probably it only compares
samples that went into a very similiar direction to see if
any additional samples would actually change the color
visibly)...

Well, I'm not too sure about all this, so anyone care to
explain to a curious user?

--
Tim Nikias
Homepage: http://www.digitaltwilight.de/no_lights/index.html
Email: Tim### [at] gmxde

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