Architects can design buildings in Revit, then export the relevant building content as a 3D model to civil engineering applications such as AutoCAD Civil 3D.
Since Revit cannot directly reference a Civil 3D file and Civil 3D cannot directly reference a Revit project, an intermediate file (.adsk export file) is use to provide interoperability between them.
Before exporting building sites, there’s a number of things to do in order to create an efficient adsk file. Here’s a list of them:
- Simplify the Model: to make your adsk file as efficient as possible, only export the relevant parts of the model (such as exterior walls and doors) and hide the rest.
- Create a new 3D view for the export
- Set the function of all non-essentials items and non-essential building element (wall, door, stairs, etc.) to interior. For each elements, the function can be set in the Edit Type.
- Hide the category of the elements that are not going to be relevant to the civil engineers (ceiling, furniture, rooms, etc…)
- Gross Building Area: One requirement of the export building site command is to have at least one area plan designated as the gross building area.
- The gross area will eventually become the building footprint once exported. Normally the area plan is based on the ground floor.
- Creating Site Utilities: You can place site utilities of interest to civil engineers such as: gas, water, telephone, cable and stream connections (hook-ups).
- Site utilities are simply loadable families that have a special connector in them. These connectors will become enabled once inside the civil engineering application. For a connector to be exported, the Utility parameter must be selected in its instance properties.
After the building site preparations is complete , go to: Application Menu -> Export -> Building Site to export.