Project Curve to Surface API?

[JohnesHou]

Hello,

How to using Revit API to project a Curve Line to a geometry surface just like this on dynamo?

Thanks

[jeremy_tammik · Accepted solution]

Afaik, the Revit API provides functionality to project a point onto a curve or surface, but not to project a curve onto a surface. That Dynamo node is probably using an additional non-Revit geometry library. Since Dynamo is open source, you can take a look at the node yourself and see how it achieves what it does. You can also integrate other geometry libraries with enhanced capabilities into your Revit add-in. If your surface is planar, you might be able to implement this functionality in pure Revit by setting up an appropriate section view and capturing the geometrical result of projecting your 3D curve onto that 2D view plane.