simtk.org

Sometimes when I scale a model, the following gets added to the new model file, and sometimes it does not:

<Force name="default">
<body_A> </body_A>
<point_A>0.0000000 0.0000 0.000000 </point_A>
<direction_A>1.0000 0.00000 0.0000 </direction_A>
<body_B> </body_B>
<point_B>0.00000 0.00000000 0.00 </point_B>
<optimal_force>1000.000000</optimal_force>
</Force>
<GeneralizedForce name="default">
<coordinate> Unassigned </coordinate>
<optimal_force> 300.00000</optimal_force>
</GeneralizedForce>

What leads to this being added to only a scaled file?

Also, I've noticed that from one scaling to another, the number of decimal points used, and how numbers are rounded varies. Why is that?