Hi @Anonymous,
I'm assuming that this is in regards to your other post? I'm just curious as to what your end goal is here. I know that you wanted to created a T-Spline model from your mesh, with which you were successful, but now you are trying to bring it into Inventor? If you would like to edit your T-Splines, my best suggestion would be to leave it locally in Fusion 360. Also, one suggestion I do have if you are trying to pull the model into Inventor is create a BRep of the model. This will turn your mesh into surfaces, which can then be successfully exported from Fusion and imported into Inventor. I guess this is really a question of what you want in this scenario, either a T-Spline model or a Surface model. If you are trying to make soft edits to the mesh, then you will want to work with the T-Spline you created. If you want to try and create a solid from what looks like a 123D Catch project, your best bet is to start with the surfaces.
I created a screencast below showing how to do this: NOTE: In order to complete this step there needs to be less than 10k triangles.
http://autode.sk/1L7q2pB
Hopefully this helps and hopefully other users will chime in as well. Mesh conversion is a tricky beast and every user has different methods as to how they hope to accomplish their goal. Personally, what I wrote above is how I would go about it. Please let me know if this clears it up for you. If not, let me know and I would be more than happy to keep helping!
PS This is a really neat looking project by the way!
Thanks,
James Youmatz
Product Insights Specialist for Fusion 360, Simulation, Generative Design