Can't convert arcs from object to geometry

Civil3D
,
1

Hello everyone,

I’m fairly new to Dynamo so please bear with me if I’ve missed something simple. I’m trying to get a list of objects on a specific layer and convert that to geometry in Dynamo. I’m able to do this with anything I draw except for arcs. I’ve tested this a few ways and can’t find a solution. See screenshot of the issue below:

Screenshot
Screenshot1399×1200 222 KB

In the images, you can see that I’m trying to pull all objects on the FRONT layer. However, I’m getting a “null” value for the arc. This error goes away if I delete the arc. Please let me know if you have any ideas on what’s going on here.

Thank you,

2

Hello,
Arcs are not implemented in the conversion to Dynamo geometry. You can change your arc to a polyline, and then convert it to Dynamo geometry.

3

Hi @Ian_duPont,

Prior to Civil 3D 2025.1, arcs were not on the list of supported geometry types. An alternative that you could consider is to download a package. The Civil 3D Toolkit is one that I’m aware of that adds nodes for working with arcs.

If you’re able to update to Civil 3D 2025.1, then arcs are supported out-of-the-box.

arc_geometry
arc_geometry984×346 21.4 KB

2 Likes
4

You can check the Solution below (for all versions of Civil 3d):

image
image918×522 36 KB

5

Thank you to everyone for the recommendations. I will get 2025 installed today so I can access those new features.

@v.v.khu I’m not familiar with the “handle” node. What do I need to plug into “handle” to get the objects to pass through?

1 Like