Find parent faces for edge from a brep

I'm wondering if there is an easy way to find parents faces from a given list of edges once you explode a Brep?

I have an imported Brep and am looking to offset an edge relative to one of it's parent faces. However, once I explode the brep into it's components I lose the connectivity? Is there a way to do this so I get a list of the two faces for each given edge?

Replies to This Discussion

Permalink Reply by Jesus Galvez on March 20, 2013 at 1:30pm

Why don't you simply use the [Explode] component with the faces from the [Brep Components (Explode)] component?

Permalink Reply by Adam Thuss on March 20, 2013 at 2:38pm

In that case I'd end up with lists of edges based on the faces. If taken as a set, there would be a large number of duplicate edges. It does keep edge connectivity to the face, but since I'm looking to offset the edge rather than work with the face, and it's easier for me to filter out duplicate faces - I'm wondering if there is a way to do the reverse (have a list of edges, find the corresponding faces).

Permalink Reply by David Stasiuk on March 20, 2013 at 4:06pm

each edge has its own path, face indices associated with each edge...

Permalink Reply by David Rutten on March 21, 2013 at 2:31am

Grasshopper does not expose the Brep topology at this point. I'll see if RhinoCommon has enough methods to create a component that does this.

David Rutten

david@mcneel.com

Poprad, Slovakia

Permalink Reply by David Stasiuk on March 21, 2013 at 3:00am

Private Sub RunScript(ByVal brp As Brep, ByVal ei As Integer, ByRef A As Object)
A = brp.Edges(ei).AdjacentFaces
End Sub

...seems to work

Permalink Reply by David Rutten on March 21, 2013 at 5:19am

Yeah it does, I just added a Brep Topology component that lists for all faces and edges in the any brep what faces and edges surround it. I'll also see about creating a decent preview that shows some of this information in 3D.

David Rutten

david@mcneel.com

Poprad, Slovakia

Permalink Reply by David Rutten on March 24, 2013 at 7:26am

David Rutten

david@mcneel.com

Poprad, Slovakia

Permalink Reply by David Rutten on March 24, 2013 at 7:37am

David Rutten

david@mcneel.com

Poprad, Slovakia

Permalink Reply by Robert Vier on June 6, 2014 at 5:03am

Hi David,

is it possible that there was a break during an update since you first released this? the component does not give me all the edge-pathes in EF-output. the preview works fine though..

or am i doing something wrong here?