The macro seems to be coming along nicely, with just one minor hiccup -- 
it probably only works well in the positive z-axis... I'm having a 
little trouble figuring out how to align the center of my point cloud 
with an arbitrary vector, and it's probably so simple that I'll kick myself.

I made a slight alteration, rather than using a union of spheres, I now 
use a blob. It seems to give a more connected look.

getting it to use splines was easier than I thought it would be.  I 
figured - because I hadn't read the documentation on splines - that I 
would have to handle interpolation myself (SO glad that I don't...)

still have to parameterise quite a bit of this code before I can 
actually make it into a macro, and I plan to add a few things, like 
angle adjustment for the nozzle and a pressure setting to allow a more 
airbrush-like operation.

basic parameters so far:

flow_rate -> number of particles per second.
duration -> number of seconds (dependant on clock if animation is on)
animate -> boolean, controls whether the spray is animated in 
animations.  setting this to false makes the spraypaint effect render 
complete.
eSpline -> controls the position of the emitter over time.
tSpline -> location of the target over time.
stencil -> a black and white pigment to be used as a stencil. optional.

planned additions:

pressure -> applies a modifier to both flow_rate and angle to give a 
different scattering.

I've attached several images for your perusal.  As usual, comments and 
suggestions are welcome.

Regards,
A.D.B.

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