Splines can be created using either the Model lines (Architecture > Model > Model lines) or Detail lines (Annotate > Detail > Detail Lines) command. For a long time, splines in Revit have been a major bugbear. The reason for this is that it is currently not possible to make a closed, periodic spline nor is it possible to trim the spline once created.
Furthermore, it is (still) not possible to snap to the start/end point so that the points are coincident. Note that if you try to move the start/end point directly, it will scale and modify the entire spline. To move only the start/end point, you need to use Tab to select it.
All of these limitations makes working with splines very difficult. In fact, there is actually not much you can do with splines within Revit. However, here are your options if you do want to work with splines:
Option 1: Native Revit splines
Since you cannot create a single closed spline within Revit you can either:
- Create a second spline or line…