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This a solution to bring your Houdini pop simulation, particles' position and rotation info, into Xsi : Pop2Xsi https://nico.delbecq.free.fr/res/Pop2xsi_v1.0b.xsiaddon ... For now it works only with a constant number of particles, no particle creation or deletion during the simulation
Using the Geometry CHOP, export your animated channels as a .chan file and bring them to Xsi.
add a geometry CHOP in your Scene and choose the popnet as SOP, set the
method as animated and the Attribute Scope to ' P rot ' and the Rename
Scope field ' t[xyz] r[wxyz]' .... Then
creates your objects in xsi ( or import them from houdini ), for each
pop point/particle you should have an object selected, and launch the