Revit adaptive family - A curved box girder bridge with varying height

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In today's tutorial, I will be utilizing the adaptive family environment to create a parametric adaptive curvedbridge with voids
Contain a parametric cross-section created with reference points, nested families, 1-point adaptive families, and 3-point adaptive family!

Timecodes
0:00 intro
0:20 Cross-section box girder
4:20 Parameters for the box-girder
7:30 Creating the void for the box-girder
8:10 Putting the bridge superstructure together
10:00 Parameters in the host family
11:20 Parameters for the second spline
16:50 Connecting the nested families to the splines
18:50 Flexing the bridge superstructure