Nothing fancy, at the moment.  Just a static point emitter with trace and
eval_pigment thrown in.

I still have quite a bit to do:  The scattering is Rand_Normal from rand.inc

Mu = 0.0
Sigma = 1.0

using a spherical angle system (random phi and theta to give particle
trajectory).

Eventually, the emitter will move along a path dictated by one spline, and aim
at a path dictated by another spline -- at least, that's the plan for now.

the stencil image will be optional, so it will be fairly versatile, perhaps even
useful for animations...

comments/suggestions?

Regards,
A.D.B.

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