Don't know of any really easy way to do what you want.

Here is a crude example i made last night:

• Exported (as .obj) a non-procedural (mesh) terrain from Vue 5i to my 3D program (Silo 3D).
• Extruded a double row of polys.
• Flattened the top.
• 'Broke' the top and sides away from the terrain (so they could be separately textured)
• Imported back into Vue and added materials.

It would be easier to just build the wall in an external 3D program (or in Vue) and just insert it into your terrain to get what i did.

But i could have done much more in the 3D program which would be difficult in Vue, like making different levels to conform to the landscape, making footings, ramparts, stairs, watchtowers, etc.

_ jc...'Art Head Start' e-book
'Art Head Start.com site Digital Art skills. Free lighting chapter, tutes, Vue models, tex pix.