bc_CAD_utils.py

def do_bix2():
    obj = bpy.context.edit_object
    me = obj.data

    bm = bmesh.from_edit_mesh(me)
    bm.verts.ensure_lookup_table()
    bm.edges.ensure_lookup_table()
    bm.faces.ensure_lookup_table()
    bm_verts = bm.verts
    bm_edges = bm.edges
    bm_faces = bm.faces

    edges = [e for e in bm_edges if e.select]

    if not len(edges) == 2:
        print('select only two edges')
        return

    itxs = [set(e.link_faces) for e in edges]
    itx = itxs[0] & itxs[1]
    if not (len(itx) == 1):
        print('two edges do not share a face..')
        return

    itx = itx.pop(); print('face idx =', itx.index)

    verts = [set(e.verts) for e in edges]
    v = verts[0] & verts[1]
    v = v.pop(); print('vertex index: ', v.index, v.co)

    vopp = verts[0] ^ verts[1]
    v1 = vopp.pop()
    v2 = vopp.pop()

    v11 = (v1.co - v.co).normalized()
    v22 = (v2.co - v.co).normalized()
    plane_no = v11 - v22
    plane_co = v.co
    dist = 0.0001

    print('face to cut', [bm_faces[itx.index]])
    visible_geom = [g for g in bm.faces[:]
                    + bm.verts[:] + bm.edges[:] if not g.hide]


    bmesh.ops.bisect_plane(
        bm,
        # geom=[bm_faces[itx.index]],
        geom=visible_geom,
        dist=dist,
        plane_co=plane_co,
        plane_no=plane_no,
        use_snap_center=False,
        clear_outer=False,
        clear_inner=False)

    bmesh.update_edit_mesh(me, True)