There is a plugin (python) for Blender that supports AC3D files - and AC3D format is supported by FS2 (Rodeo is testing adding AC3D objects into scenery in another thread here in this forum). If we can import FSX/P3D scenery objects and export to the AC format, we can see them in FS2!! AC3D itself could also be used - it costs about $100 USD - but Blender is Shareware. I don't know if both 3D modelers have the same capabilities.
EDIT: OOps, I forgot - we do need AC3D right now so we can export to the Aerofly FS2 TGI format which then is converted for final use by the SDK content converter. But still, Blender could be used for modeling, then AC3D for conversion to TGI?? Maybe IPACS or one of us could figure out a direct export to TGI from Blender.
@IPACS, is the TGI format proprietary?
Here is the github for the AC3D plugin - https://github.com/majic79/Blender-AC3D
I have a dialog with the Dev of the plugin going right now for some changes to the plugin (maybe you could help test and improve it)
Could you please supply the FSX/P3D(BGL) plugin?
For that matter, Arno Gerretsen's ModelConverterX - a tool that most FSX/P3D developers will be familiar with - can read/write/convert files to the AC3D format as well. I downloaded the AC3D exporter for Blender and am trying it out now. This could be a promising avenue for porting content to FS2.