Attached Link: Z'd scene

I've done it in Bryce and the principle is the same in Vue. In this one I set up the scene as usual and used a radial behind the camera with falloff set to none and turned off shadows. I went into camera space and selected each object, except the horizontal ones, and reduced the Z size to very small. I then selected the horizontal items (flat terrains) and set the Y size very small.

You'll want to simplify your materials as well.