I haven't done any more work on the diffraction stuff, but I did happen across
an interesting parametric equation describing the real shape of a falling
raindrop.

r = Sigma [A * ( 1 + Cn * cos(Cn * Theta)]
with a table of 8 C values for droplet radii ranging from 0 to 3mm

Had a devil of a time working that all out so that the values get linearly
interpolated for any given raindrop size.
Then I:
plotted it out with spheres,
messed up the parametric {},
tried to convert the parametric into an isosurface,
tried to render a sor {};
fixed my parametric {},
finally used a lathe {}, and added an ior of 1.33

I generated 100 raindrops of each size and randomly translated them.

- BW

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