Per-frame dye decay.
Dye intensity per uv-unit/sec of mouse speed.
Dye-splat falloff (uv² units).
Jacobi iterations per frame (1 is the established default).
When true, output is the raw dye buffer instead of advected src.
Simulation grid resolution in physical px.
Velocity injected per uv-unit of mouse motion.
Velocity-splat falloff (uv² units).
Per-frame velocity decay.
Vorticity confinement strength.