Just puttin in a wishlist for vrmesh proxy objects to be rendered when they have a transformGeometry node attached to them. Maya likes to use this quite a lot with certain procedures and instancing so it would be extremely useful for V-Ray to be able to incorporate them.
I’m not entirely clear why they sometimes get created (I think the main reason I come across them in Maya is with multiple instances and groups) but the easiest way to create them is to freeze their transforms.
If you try the below MEL on a proxy object Maya should generate a transformGeometry node, and the mesh will fail to render even though the VRayMesh node is still connected:
move -r 0 10 0; //(moves the object away from 0,0,0 for transforms to be frozen)
makeIdentity -apply true -t 1 -r 1 -s 1 -n 2;