> samples for focal blur

	As Apache, I'm surprised to see the distribution fills a square
and not a circle. Actually the first 20 samples clearly show that
the circle is the target, which is logical (I kinda remind that
the 3.1g source code tells it).
	Could you just explain how you obtain those pictures for
the focal blur distribution ?

	On another hand, assuming the distribution is really in a
circle, I guess it could be worth using a Halton sequence when more
than 50 samples (or 37 according to hexgrid4size in render.cpp) are
requested.

	- NC

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