Automatic Cross-Section Rotations using Dynamo

Dynamo can be used to Set the Cross-Section Rotation parameter for multiple beams.

In this example, I am creating purlins using 'Beam System' in Revit, then using Dynamo to set the Cross-Section Rotation for all the Purlins in the Beam System so that they follow the curve profile.

Here's the workflow:

1. Create a Beam System in Revit:

Selecting the curved members as supports (Be sure to set it to 3D in the Properties)

2. Use Dynamo to set the Cross-Section Rotations: