Creating a Toposurface by Instance

Creating a toposurface by instance requires that you import a CAD file. After you do so, you can go to the Toposurface command, which offers the choice to use an imported instance to drape a surface from Revit.

To get started, you can either choose a site that was created in CAD that you want to experiment with, or you can go to the book's web page at From there, you can browse to Chapter 18 and find the file called contours.dwg.

The first thing you need to do is think about coordinates. That's right: coordinates. You're bringing in a file from AutoCAD, right? How do you know where this site will be placed? You must consider two things: where the project base point is in AutoCAD, ...

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