Heres a couple of updates from things I was working on prior to the HairWorks updates.
Flex Plastic Deformation
Flex Particle Component (Contains 225,000 particles)
Basically its an option on the Flex Component to enable Particle mode, which allows you to configure particles directly, has some advantages over using cascade, such as:
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Specific placement of particles using blueprints (Also comes with Fill Volume, Shape, and Particle Grid)
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Unlimited (Up to the Container amount) number of particles, not limited by the number of particles in UE4. Will just continue to render more and more batches as more particles are added
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Can save the flex simulation results like you can with other Flex objects, so setting up the Sand Castle example becomes very easy or bodies of water at rest
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Dynamically spawn in particles at any given time
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Uses the same particle rendering as particle systems, so should be pretty efficient
I have plans to allow for fluid rendering. I have no plans to remove the cascade portion, because that is handy for flowing liquid. I just find it easier to work with bodies of water and solid shapes using component.