Hi,

I am simulating a friction process in Materials Studio, and I want to move a group of atoms in the system, which has been defined in a set. I tried to use:

foreach my \$atom(@\$atoms){
\$atom->Velocity = Point(X => 0.5, Y => 0, Z => 0);}

to give that set of atoms a velocity so that it can slide against the other material. However, in the trajectory document from the output, it looks like that set of atoms did not move and just vibrated near its initial position. Can anyone give me some clues why the result is like that? Thank you very much!