Houdini: Pre-Roll/Warm-up/Pre-Sim Particle Pop Simulation

I'm explaining how to have a particle system pre-simulate so that it does not build up when you need it.

[@rendercrap]

Thank you. Took me a while to find this. Thanks!

[@mjparent222]

thank you for sharing your discoveries. very helpful.

[@wewantmoreparty]

thanks

[@christopher8116]

Re-create the POPNet inside a DOPNet.

[@kg4135]

How can we pre-roll a low res flip sim (0-60) to later upres it (60-150)? Edit: I actually did all the pre-roll thing but when I try to re sim it again at high res only some particles move & the last frame of cached sim seems to be stuck drive.google.com/file/d/1FICZaOIK7b2bANyQQPKju-IReuFhmSWH/view?usp=sharing drive.google.com/file/d/1tUB2WwJRqpSpnsj3AogHOSmz6ynRGGpG/view?usp=sharing