Box Culvert in ArcScene

[BondHarper]

Hi all,

I am trying to create a multipatch of a box culvert for export into CityEngine. I have a line with the correct elevations, but need to extrude in both the x and y directions to get a box. When I buffer the 3d line using the standard buffer, I lose the elevations. When I use the 3d buffer I get a cylinder. I thought I could display as a strip using 3d line symbols and then extrude, but that just creates a flat "wall". The only 3d line symbology is a tube.

Any ideas how to achieve this in ArcGIS alone without using FME to extrude then rotating 90 degrees and using FME to extrude again?

Thanks!

[MorganHarris]

Did you ever figure this problem out? I have a similar issue where I want a buffer for my line that extends horizontally, but follows the same elevation contour as my line.