Quote - Here is a short and fast test if a geometry (actor/prop) needs more than just one material:

geom=actor.Geometry()
polys=geom.Polygons()
if [p for p in polys if p.MaterialIndex() != polys[0].MaterialIndex()]  :
    print "more than one material in this geometry found"

Simpler would be to use geom.NumMaterials() > 1 as the test, no need to iterate over the polygons.