This parameter is for making it easier(cheating) to get out from mud. To get stuck in real mud isn't fun at all, so this makes the mud push up. Ranges in this parameter are from 0 to 1 . If you set it at 1 then you'll get real mud. For values from 0 to 1, the behavior goes from real mud to easy mud depending on this parameter and the value of Adhesion velocity. For velocity 0 real mud it is. For velocity >= adhesion velocity easy mud it is.
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