[MOTIONBUILDER] How to get a list of deformed vertices

Hi - I’ve bumped into a problem with motionbuilder. I’m trying to extract the positions of vertices in motionbuilder as they are after all the deformers are applied but the GetPositionsArray method returns me only the positions of the vertices before the skinning is evaluated.
Can anyone tell me if this is actually working in pyfbsdk or should I look for a C++ workaround?