Hi @qlabrosse,
If you are working from within a RhinoCommon plug-in and you have a Rhino Brep object, then you can use RhinoObject.GetMeshes.
If you just have a Brep, or you are using Rhino3dmIo, then you’ll need to iterate through the Brep’s faces and accumulate the meshes from each individual face using BrepFace.GetMesh.
Does this help?
– Dale