Now we want to modulate the segment so it looks more like a droplet sliding down a surface.

First I modulate the radius. I modify the calculation of h as follows.

Calculate a value, h, for use in displacement.

The value of h is going to produce a circular cross section.

The radius of the cross section is defined by a distance, R.

We'll use a parameter node to define R.

R = PM(.1, "R")

Modulate the radius so it starts a little smaller and grows to full

size at the end of the segment.

mR = R * (.7 + .3 * Bias(seg.ct, .3))
rx = seg.pcx / mR
ry = seg.pcy / mR
h = Sqrt(Clamp(1 - (rx * rx) - (ry * ry)))

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