Offsetting polygonal faces on mesh (with Clipper?)

Hi. I’ve just been experimenting with basic mesh operations in oF, and at present I’m seeding a ofMesh surface and just implementing a basic Voronoi pattern onto the mesh surface using the ofVoronoi addon:

However, as far as I can tell, the way that oF deals with meshes is by ‘rendering’ strokes between two vertices and not really using say polylines—so is it possible to ‘offset’ each of these faces inwards?
My searching led me to finding Clipper, but I’ve not been able to successfully get the GetOffset function working. Does anyone have any experience with this?