How can I constrain negative rotation? (not positive)

[GroRaisin]

Hello,

I would like to know the procedure to constrain a reference node in one rotation direction only.

The node should only be able to rotate in the positive UR1 direction, therefore no negative rotation is allowed.

How can I implement this?


Thank you very much,

Regards

 

[haiger841213]

I think you can attach a point-to-ground nonlinear spring to the node in UR1 direction. The stiffness of the spring may be as following:

-1000000, -0.001
0, 0
0.001, 1000000

that is: the spring is very soft in the positive direction while very stiff in the negative direction

 

[GroRaisin]

Simple idea, I am going to try it!


thank you very much.