Phantom meshes in Alembic Export

[tyFlow]

This is something that can only be addressed by the EmberGen guys....tyFlow uses the standard Alembic visibility property on pre-born particles, in order to hide them before they are born. If they appear in EmberGen/Blender then those Alembic importers are ignoring that property. Nothing I can do about it on my side (I could potentially scale pre-born particles to zero, but there's no guarantee that Embergen wouldn't still attempt to emit from zero-scale geometry)...the visibility property is the standard way to 'hide' Alembic elements before they're meant to be seen, and it works in Max, VRay, Unreal, etc.