Rotary Spring 

The Rotary Spring constraint doesn't do anything on its own, so use this only in combination with other constraints like Pivot, Spring or Pin Joint. What it does is when an object starts rotating by an interaction, it will  eventually make the object start rotating back in the other direction.

Rest Lenght, Stiffness and Damping should act the same as with the Spring constraint, but I haven't noticed much difference in the behaviour of an object by changing these parameters. But I must admit I haven't used this constraint much yet, so feel free to experiment yourself.


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