BMesh: Accessing edges of created mesh

Question

Let’s say I created a bunch of these cones in my_bmesh object:

c = bmesh.ops.create_cone(my_bmesh, segments=8, diameter1=1, diameter2=1, cap_ends=True)

Is there a way to access a cone’s edges (preferably right after I create it) so I could connect it with other cones using bridge edge loops?

Answer 1

Slice based on pre op lengths

It is my experience that new geometry is always appended after using the bmesh create operators.

Hence can look at the length of bm.faces before, and use to slice after.

A more robust result could be achieved with sets of elements prior and after.

import bpy
import bmesh
ob = bpy.context.object
me = ob.data
bm = bmesh.new()
bm.from_mesh(me)

nv, ne, nf = (len(bm.verts), len(bm.edges), len(bm.faces))
ret = bmesh.ops.create_cone(bm, 
        segments=3, 
        diameter2=2,
        depth=1,
        cap_ends=True)

print(len(bm.verts[nv:]), "New Verts:", [g.index for g in bm.verts[nv:]])
# check if new verts slice and op return are the same
same_verts = not bool(set(bm.verts[nv:]) - set(ret['verts']))
print("Slice and op return same verts?", same_verts)
print(len(bm.edges[ne:]), "New Edges:", [g.index for g in bm.edges[ne:]])
print(len(bm.faces[nf:]), "New faces:", [g.index for g in bm.faces[nf:]])

''' Result

4 New Verts: [8, 9, 10, 11]
Slice and op return same verts? True
6 New Edges: [12, 13, 14, 15, 16, 17]
4 New faces: [6, 7, 8, 9]

'''

Answer 2

Solved it:

(prev_edges -> edges from previous cone)
c = bmesh.ops.create_cone(my_bmesh)
verts = list(c.values())[0]
curr_edges = verts[0].link_faces[0].edges
total_edges = [e for e in prev_edges] + [e for e in curr_edges]
bmesh.ops.bridge_loops(my_bmesh, edges=total_edges)
prev_edges = verts[-1].link_faces[0].edges