[Toady]

It seems everyone uses Sketchup to create level geometry. To me it's a bit convoluted, and I can work much faster in other programs.
Has anyone used 3DS Max or a similar alternative? If so, have there been any issues? Would I need to import the models into Sketchup?

Thanks for any input! I apologize for not knowing the editors and hacking tools enough to try this out on my own. I plan on doing so as soon as I have the time.

[Vidoy]

The file will need to be exported to a Wavefront .OBJ file, as long as you can export it to that, any editor should be fine There's also some limit on the amount of polygons, read a bit here https://sites.google.com/site/messiaen64/level-importer