Hi JTB, yeah MoI to Revit is not very smooth right now.

Revit kind of looks like it is not really set up to read polygon-mesh type data into it.

It does support DXF and I want to try and add that into MoI, but DXF is also somewhat problematic for polygon data, it actually has some similar limitations as 3ds for that kind of data, but it can hold a lot more kinds of things in it like lines, arcs, and curves. I would not be surprised if Revit is more focused on reading things like 2D line drawing plans from DXF/DWG instead of polygon data.

One thing that is interesting is that Revit also supports reading in SAT format - this is actually a full NURBS solid format and not polygons.

I think that it is going to be possible for me to get SAT export from MoI in version 2.0, so once that is in place that may provide a good route to Revit.

Your best bet right now may be to try and get your NURBS data into AutoCAD and then use the satout command in ACAD to write out an SAT file and bring that into Revit.

MoI will export NURBS data to either the .3dm or IGES file formats.

A long time ago AutoCAD used to support the IGES file format, but for whatever reason they removed that from the product some time ago.

So I think you'll need to get a plug-in for AutoCAD to read the MoI NURBS data into it.

It looks like Sycode has a couple of different AutoCAD plugins that could do the job here, they have a .3dm import and also an IGES import, here is the 3DM import:
http://www.sycode.com/products/3dm_import_ac/index.htm

They have a trial version there so you can give that a try and see if that will work for you - that route would be save from MoI using .3dm file format, Read .3dm file format into AutoCAD using Sycode plugin, export SAT format from AutoCAD using SATOut command, and read SAT into Revit.

Please let me know if this method works for you or not, I do want to make it easier to move data from MoI into Revit and I hope that SAT format may do a good job for this but I don't know for sure yet.

- Michael