I'm pretty interested in this, for the same reason as Gus. Been looking at AC3D as a collada output for Blue Mars.
If it's any help, there is this post from Blue Mars admin. It's about sketchup but may apply here...
Quote:
The issue is not that Blue Mars doesn't support untextured meshes, but that SketchUp exports untextured meshes without vertex normals and UVs. Blue Mars importer doesn't support the import of meshes without vertex normals or UVs. FBX Converter is probably adding normals and UVs in the conversion process.
The exact details of what is and isn't supported can be found at the Blue Mars COLLADA compatibility guide
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I'll keep watching this thread :-)