I just found a bug in OZ where it wasn't exporting masked textures to .S3D properly when they have separate opacity maps (like the leaves in that tree you posted). I just whacked OZ 4.6 and uploaded a version with a fix.
At this point I have no idea how or where particle effects are stored so I can't say. It's sort of beyond the scope of OZ since that is really intended to only make zones. If we ever figure it out I think a more generic modding tool would be more appropriate.
WC
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