The Align Strand to Particle Trajectory compound makes the strands follow exactly along the particles' paths (trajectory). This is useful for creating ribbons, party streamers, or snakes whose trajectory is varied and dynamic.
Unlike the Constrain Strand Length compound that always keeps the strands the same length regardless of movement, these strands may "stretch" a bit in order to follow the particle path.
Create strands with the Create Strands or Emit Strands compound, then plug this compound's Execute output into a PostSimExecute port on the Simulation Root node or in a port on the ICETree node.
For information, see Aligning Strands Along the Particle Trajectory [ICE Particle Simulations].