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Suppose that I want to create a flame effect with a single sculpt. I want the fleck animation to cyclically move flecks from the base of the flame to the tip and slightly beyond. On the side of the flame, that direction is along the surface - that's "flow". But at the tip of the flame, that direction is perpendicular to the surface - that's "evaporate". A sculpt can't have flow on one part of its surface and evaporate on another, so that rules out making the flame effect with a single sculpt.
But what if each fleck effect had another slider from -100% to +100% with a default of 0% that controlled how the fleck effect was modulated? At 0% it wouldn't be modulated at all. At -100%, it would be fully modulated by the cosine of the angle between the surface normal and the comb vector. And at +100%, it would be fully modulated by the sine of the angle between the surface normal and the comb vector.
Assuming that the sculpt's comb direction is from the base of the flame to the tip, I could set the modulate slider for flow to +100% (sine) and set the modulate slider for evaporate to -100% (cosine), and the fleck animation would be mostly flow on the side of the flame and mostly evaporate at the tip of the flame.