Hi Brian,

Yes, there is a clear logic behind. It has to do with a rotation of object to array during its sliding along a curve:

Freeform: Objects are rotated in three dimensions as they are arrayed along the path curve.

None: The objects do not rotate as they are arrayed, but remain in their original orientation.

Flat: Flat will only do rotations about the world Z axis (not a consistent up-direction relative to the construction plane, though. But it is already on the wishlist).








Petr