I have a fence curve which goes down a hill and fence posts duplicated along it using the Array and Curve modifier. How do I stop my fence posts tilting with the angle of the fence? I would like them to remain realistically upright as they go down the incline. The post's origin is on the exact same place as the fence's and duplicated with the Array modifier, using the fence curve in the Curve modifier.
Fence properties (Bevel Object 'fence to curve' is the shape extruded along the curve to make the fence itself)
Fence post properties('Fence Curve.RIV...' is the fence curve)