I would like to share another Grasshopper - BIM exchange approach which supports Revit and AutoCad Architecture. I developed "Gravit" during an intensive Workshop about high-rises (Design Research Exchange) where we had to transfer complex Rhino geometries to Revit.

The Idea behind Gravit is to create abstract BIM objects directly in grasshopper and send them with one click to Revit (RVT) and/or AutoCad Architecture (ACA) where they are interpreted as native objects. In ACA and RVT most of the objects are defined in a similar way: Walls for example consist of baselines, styles (ACA) or types (RVT), height value and further properties in ACA or parameters in RVT. Therefore an abstract wall object only needs to contain these properties to be rebuilt in both environments or even more. The object library also contains the Gravit client to receive data from the Gravit server in Grasshopper. Adding another program to be capable of receiving Gravit objects is quite easy, it just requires the implementation of abstract object Parser. The current implementation supports ACA (Walls, Doors, Curves, Rooms, Columns, Points and Slabs) and Revit (General Families, Adaptive Components, Hatches, Curves, Rooms, Walls, Columns, Gridlines, Levels, Slabs and Topography).

Each of the components will give you a preview to give you an idea how your model will look like in the target application. Once you assembled a model you simply add a "send" component which serializes and sends the components via TCP. There are no export files required, it is a simple one click operation. In RVT or ACA you need to start the client software to receive the Components. It doesn't matter if the client runs on localhost or anywhere else in your network. Once the client received the objects you simply click "ok" and your BIM Model is going to be assembled. Gravit also supports updating the objects. Once you changed a your geometry in grasshopper you just click send again and the client will update the geometry of the objects. The major difference to the existing solutions is: it requires less configuration, you get a preview of the model in grasshopper, there are no additional files and it supports Revit and AutoCad.

I would be very interested in your opinion about it and would love to share the whole source of the next release which will hopefully support Microstation Architecture.

Here,here and here are some videos in action.