The STEP format (preferably version 2.14) is a generic format that can be used between CAD
software such as Blender, UGNX, CATIA, and SolidWorks. It is abbreviated as STP as well.
I am experimenting with CATIA, making models for FSX and can then export them as
.STP files to Rhino3D. Rhino can export as .X files which can ultimately become .MDL with
Model Converter X.
Problem is, my evaluation copy for Rhino3D has expired. I have found a workaround though.
It appears exports from CATIA as .STL files (stereolithography - used for 3D printing) enables
me to import into Blender at 1/2 scale. Then exporting from Blender as .X to MCX.
I guess STL files work fine. Just need to remember to scale it by 1/2.
Again, your work creating MCX is a marvel. Thanks for your efforts!!
-phingerz