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RealFlow comes with two plugin daemons: "Morph" and "CrowdFlow". You can also find some complete examples available under RealFlow's SDK folder. There you can go through some C++ programs, which give you detailed instructions on how to create your own plugins.
Daemons - Tutorials
- Foam with SPH Particles
- Scripted SplashesCalm Fluid Surfaces
- Dancing Smarties