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.

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