i found this nice tutorial: ParticleStream [www.sidefx.com]
It´s an old one and with houdini v18 there is no particle node there anymore and i don´t know how to solve this in v18.
At 08:42 he use a torus as emitter and emitted the particles ordered in point order. How can you do this in v18?
How to emit particle per point in point order?155 2 0
Here's one way. A sort sop shifts the first prim forward by 1 each frame, I then keep only the first prim, and emit that. The rest of the setup is more or less the same as the video tutorial.
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