How can I create vertical posts that follow a landscape? I'm trying to create railings that follow a landscape, something like this (side view.)



So far I've:


created a plane.
parented the "post" object to the plane.
added an array modifier to the plane.
added a curve that follows the landscape.
added a curve modifier to the plane, using that curve.
enabled duplication on faces to the plane.


That gets me a row of posts that follow the landscape, and the post meshes themselves aren't distorted by the curve, but it leaves a problem: the posts point along the normal of the curve/landscape, I need them to be vertical, so that I can add the railing passing through the top of each post.

any ideas to solve this?
When you just delete one side of your plane leaving two single Vertices behind and setting the Duplication to Verts, you'll get what you want!?