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A particles' radius ranges between 1 (birth) and 0 (death). Mist will be created when a particles' radius is greater than the given value. A particle's Values, closer to 1 create more mist.
The radius is controlled with the → "Splash min | max lifetime" and → "Wet min | max lifetime" parameters. These values lifetime parameters have to be applied to the splash particles simulation before the mist simulationpass.