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Isotropix has recently uploaded a tutorial showing how to use point clouds built in 3rd party software as a distribution source for a Clarisse scatter. The guide uses Houdini as an example, but point clouds from any app should do the trick.
Learn how to use point clouds out of other softwares (In this case Houdini) as support geometry in a Clarisse scatterer.
Check out this page for more info and tutorials on Clarisse from Isotropix.