How to Use reference lines to control radial shapes in Revit

This CAD software tutorial covers how to use reference lines to constrain or drive radial shapes in Revit Architecture. This can be tricky when using Reference plane but with a reference line it is quite easy. David doesn't get too much into adding parameters but one could imagine using a length parameter to drive the length of the reference line as well as the ellipse. Watch and learn how to model and control radial shapes with reference lines in Revit Architecture.