Filtering Mesh edges sharing 2 faces - Sandbox Topology, EdgeAdjacency or?

Scripting
1

HI i’m trying to filter the edges of a mesh to get those which share 2 faces. (basically getting the interior edges of a mesh)
I tried with sandbox, MeshTopologyEdgeFilter python command, with no luck.
I’m not sure if the problem is the data structure or the syntax.
here an attempt:

m_e=gh.Sandbox_Topology.MeshTopologyEdge(b)

filter=[]

for i in range(len(m_e[0])):
    filter.append(2)

me_f=gh.Sandbox_Topology.MeshTopologyEdgeFilter(m_e[0],m_e[2],filter)

his gives none as result

I tried also with an iteration and works slighlty better, but i’m not able to filter, and i always get just all the edges.

I guess this can be done in a lot of ways. Also I tried Rhino.Geometry.EdgeAdjacency but I cannot find the right input.

thanks in advance for any help

2

GetConnectedFaces returns all faces connected to an edge. If the number is two (2), then you have it. Like so:

int[] faces = ... GetConnectedFaces(edge_index);
if (faces.Length == 2)
{
    twoface_list.Add(edge_index);
}

http://developer.rhino3d.com/5/api/RhinoCommonWin/html/M_Rhino_Geometry_Collections_MeshTopologyEdgeList_GetConnectedFaces.htm

// Rolf

1 Like
3

Thanks ! it works much better!