I've finally been able to get this working and wanted to post it here for reference. Thanks to Perry for providing a lot of the advice and explanation which made figuring all this out possible.
is a free 3D modeling (and animation) tool. I was interested in creating 3D objects to place in my FMS landscape using this tool and found the below to work well.
- create the object in the object mode of Anim8or and use 4-sided quad-based geometry (ok to have other face types, but they won't show up in FMS)
- export the object as a Wavefront (.obj) file
- use the wf2scn converter tool I wrote to convert the .obj file to an .scn file
- paste the contents of the generated .scn file into , save, reload, then drag to position your object and save again
You can download the wf2scn converter tool executable and source code .