yade-dev team mailing list archive

[Bruno Chareyre <bruno.chareyre@xxxxxxxxxxx>]

> I understand that in (*) you have to compute 1 square root, have to make
> sure that |v|>0 etc, making (**) more efficient,
There would be no square root even in (*). On this aspect it is almost 
exactly the same.
You simply use a unique sign(v1f1+v2f2+v3f3)  corresponding to a unique 
damping coefficient in (*), vs. three sign(f1v1), sign(f2v2), sign(f3v3) 
for three independant damping of the DOF's in (**).

B.