I personally don't like the way I'm using the 'density' keyword to specify
photon density.  Usually, when you say density, you want to give a
items-per-area(or volume) value, not a length value.  So... what would be a
better keyword?  Would 'spacing' be good? (since you are giving the spacing
between photons)  I do not want to switch the value to a real density, because
right now photon 'density' and gather 'radius' are directly related (linearly),
making it easy to test with a low number of photons and switch to a large
number with predictable results (my 'phd' variable, for those who've looked at
my source).

So... is 'spacing' good?  Any other ideas?

-Nathan

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