bmesh edges for face

Coding Python Support
1 



print ('List of faces ')
print ()
totalverts = len(bme.verts)
totaledges = len(bme.edges)
totalfaces = len(bme.faces)
print ()
print("
This object contains:")
print("%s Vertices, %s edges, and %s Faces." % (totalverts, totaledges, totalfaces))
print ()
for face in bme.faces:
faceindex = face.index
verts = len(face.verts) # Don't need edges because verts == edges on same face
list.append(verts)
print("Face %d has: %d verts and %d edges" % (faceindex, verts, verts/2))
if verts==4: # quad face but coplanar ?
print('Quad face index=',faceindex)
for e1 in face.edges:
# print('edge=',e1)
for v1 in e1.verts:
print('vert=',v1,'c0=',v1.co)
print ()
print (' End of face quad')

but this does not show the right number of edges

how can it be corrected

thanks

2

what is the supposed number of edges and what does it tell you?

3

this was working last year

print(“Face %d has: %d verts and %d edges” % (faceindex, verts, verts/2))

but now it does not really work anymore!

let me find the script to run it be back later

thanks

4

try:
print(“Face %d has: %d verts and %d edges” % ( faceindex, verts, len(face.edges) ))

5

I doubt it did, it probably just seemed like it was working, but actually failed for corner cases. Consider a mesh with loose verts: if you got two unconnected vertices, your calculation would claim that there’s 2/2 = 1 edge. verts/2 is obviously wrong. If you had 3 loose verts, it would even give you a bad type (3/2 = 1.5 -> float). And 3 connected vertices can make up two edges, or 3 + a face.

6

as i remember this was working last year

try it on a simple cube

this should give the verts for one simple edge only on a face
which mean only 2 verts first one and second one!



 
import bpy
import bmesh
 
 
# http://www.blender.org/documentation/blender_python_api_2_62_0/bmesh.types.html#bmesh.types.BMesh
 
 
 
 
 
my_mode = bpy.context.object.mode   # Check if object mode is EDIT, needs to be for bMesh
 
 
 
if bpy.context.object.mode != 'EDIT': 
 bpy.ops.object.mode_set(mode = 'EDIT')
 
 
 
 
 
object = bpy.context.object.data
bm = bmesh.new()     # create an empty BMesh
bm.from_mesh(object)    # fill it in from a Mesh
 
 
totalverts = len(bm.verts)
totaledges = len(bm.edges)
totalfaces = len(bm.faces)
 
print("
This object contains:")
print("%s Vertices, %s edges, and %s Faces." % (totalverts, totaledges, totalfaces))
 
 
 
list = []
 
 
print ()
print ('List of faces verts edges using  % (faceindex, verts, verts/2)')
print ()
 
for face in bm.faces:
 
 faceindex = face.index
 verts = len(face.verts)    # Don't need edges because verts == edges on same face
 list.append(verts)
 print("Face %d has: %d verts and %d edges" % (faceindex, verts, verts/2))
 
print ()
 
           # Check for the most verts
max_value = max(list)
max_index = list.index(max_value)
print("
%d is the most verts in a face. That face %d" % (max_value, max_index))
print ()
 
 
 
 
print ()
print ('List of faces verts edges ')
print ()
 
 
 
for face in bm.faces:
 
 faceindex = face.index
 verts = len(face.verts)    # Don't need edges because verts == edges on same face
 list.append(verts)
# print("Face %d has: %d verts and %d edges" % (faceindex, verts, verts/2))
 print("Face %d has: %d verts and %d edges" % ( faceindex, verts, len(face.edges) )) 
 
print ()
 
           # Check for the most verts
max_value = max(list)
max_index = list.index(max_value)
print("
%d is the most verts in a face. That face %d" % (max_value, max_index))
print ()

the new line seems to be ok now

this was one of the first example i got for Bmesh
but anyway now seem to work again which is good

thanks