I'm trying to simulate particles flying through a tube. At the moment I'm using follow POPs with some leaders. Unfortunately the result does not deliver what I need because the particles are crossing each other flying from leader to leader. Is there a more simple way to send particles through a tube? I don't need collision between the particles and the tube; the particles shall just follow the tube.

tip #1 - test with far less particles

tip #2 : http://www.cmivfx.com/tutorials.asp [cmivfx.com]
Tutorial 40: Flowing Particles Along L-Systems Curves In Houdini

Unfortunately the creep OP on the SOP level does not work for me because after simulating the particles some time through a tube I want them to fall on an animated surface. :?:

PS: I found also the tutorial at the end of the post: http://www.sidefx.com/index.php?option=com_forum&Itemid=172&page=viewtopic&t=2283 [sidefx.com]