A couple of Houdini assets I created to make any kind of geometry growing easier. You just plug a set of points describing motion and your animated geometry samples, and take a seat to watch them raise.
The first asset samples the points path to draw curves or tubes, so it’s good for creating streams of objects.
The second asset uses the points attributes and its own parameters to instantiate geometry samples, offsetting transform and animation to add randomness.
You can find the OTL file here.