> I have already looked at it, and it does do something very similar to what 
> I
> want, but is still on arbitrary values.

The origin of a ray is perturbed semi-randomly X,Y along the "film",
from there it passes through the focal point until it has some
color from raytracing the scene. Aperture controls the amount of
random displacement of the origin of the ray. Each final pixel on
the "film" is the weighted average of the sample rays cast. At certain
sample sizes the displacement pattern is pre-set to provide a good
hexagonal grid, as more samples are used they are added randomly
positioned in addition to the pre-set grids. So for example if you
have 50 samples, 37 of the samples will be the largest pre-set
pattern, and 13 samples will be random patterned. In general the
pre-set patterns are weighted so that rays that are displaced farther
from the actual pixel origin have less contribution to the final pixel
value. That's why it's considered arbitrary, the falloff data comes
from an array instead of a function.
Overall it's close to being recpirocal of displacement distance.

Unfortunately this means that there is no easy way to set DoF without
accounting for differences based on samples, and general POV scales.

The results are also not diminished in luminance over distance
like with a RL camera, so far away blurred objects can look brighter.

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