Springs dont move the particles CVs vertices or points
Either no force is acting on the particles or the restLengthPS is turned on but you didn't set any values for it. By default, each spring's rest length equals its original length. It won't move unless an external force is applied to it.
A pair of identical particle grids with springs are shown here after several frames of play. The particles on the right fail to move because restLengthPS is turned on while the default values are in use.
To make the springs take effect, do the appropriate action that follows:
1 Animate the object, for example, with a field.
2 Use the Component Editor to alter restLengthPS. See "Editing per spring rest length, stiffness, and damping" on page 191.
3 Change to per object rest length.
4 If the springs are on particles and you broke the default connection from time to the particle shape node's Current Time attribute, reconnect the input to Current Time. A simple way to do reconnect the time input is to select the particle object, select the Current Time attribute in the Channel Box, then select Connect/Add > Connect to Time.
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