Obtaining Edge Count of individual faces within a closed Brep

[cncduck (Derek)]

I would like to select a face from a closed Brep based on edge count. When I select the object and print out its face list the edge count for each face is the same value. It just prints out the edge count of the entire Brep and not just the edges pertaining to that face. I feel like I am missing something simple, any insight would be much appreciated !

Example Brep.3dm (379.3 KB)
Get_outline.py (332 Bytes)

[dale (Dale Fugier)]

Hi @cncduck,

In order to get the edges for a face, you’ll need to traverse the topology. That is, given a face, get the loops. With the loops, get the trims. And with the trims, get the edges.

Here is some sample code to get you started.

test_traverse_brep.py (4.7 KB)

– Dale

[cncduck (Derek)]

Hey @dale,

Thanks for this ! I have been tinkering around with it and am getting what I need from it. Is there more documentation on loops ? What exactly are they ? Thanks for the help !

[dale (Dale Fugier)]

Hi @cncduck,

A Brep Loop is part of a Brep’s 2d topology.

– Dale

[cncduck (Derek)]

@dale Great !

Thanks for this !