v = ∇ × ψ  ·  ∇ · v = 0
f = fbm( p + 1.8 fbm( p + … ) )
fbm( p ) = Σ 2⁻ⁿ noise( 2ⁿ p )
pₙ₊₁ = pₙ + v Δt
b = ½ + ½ sin( ω t )
c′ = c cos θ + (k × c) sin θ + k (k · c)(1 − cos θ)
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