Why does setting InverseMass to zero on a single particle freeze all particles?

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You might be able to switch from fluid particles to granular particles at runtime (that behave like solids), and then set inverse mass to zero on the granulars. But to be honest I haven't tested this. Never had this use case in mind while designing the asset.

Will do some tests and get back to you.

Thanks Jose!

I just tested this morning and it seems like granular particles can have invMass = 0 and the fluid particles will flow around them. Woo! I just am not sure how to convert from fluid to granular at runtime.