Gray–Scott Reaction–Diffusion

∂u/∂t = Du∇²u − uv² + F(1−u)  ·  ∂v/∂t = Dv∇²v + uv² − (F+k)v
step 0 · ΣV 0.0
Du=0.16 · Dv=0.08 · F=0.035 · k=0.062 · grid 160² · toroidal wrap · dt=1 · 2 steps/frame
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