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I followed this and ended up with a closed mesh.

import bpy,bmesh
import mathutils
from mathutils import Vector
bm  = bmesh.from_edit_mesh( bpy.context.object.data )
operate_faces=[a for a in bm.select_history]
n = Vector((0,0,0))
for i in operat_faces:
    n += i.normal

r=bmesh.ops.extrude_face_region(bm,geom=operat_faces)
verts = [e for e in r['geom'] if isinstance(e, bmesh.types.BMVert)]

z = mathutils.Vector((0,0,1))
axis = n.cross(z)
angle = n.angle(z)
R = mathutils.Matrix.Rotation(angle,4,axis)

bmesh.ops.translate(bm, vec = Vector((0,0,.3)),space=R,verts = verts )
#bmesh.ops.delete(bm, geom=operat_faces, context=5)

bmesh.update_edit_mesh( bpy.context.object.data )

enter image description here enter image description here

but I want the original faces to disappear, so I used

bmesh.ops.delete(bm, geom=operate_faces, context=5)

to delete the faces. Is there a better way?

PS: I tried to use extrude_discrete_faces(), but the faces that extruded were not connected.

enter image description here

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  • $\begingroup$ wow,thank you for correcting,i am new here,and not very good at English. $\endgroup$ – Joe Davidson Nov 19 '17 at 14:48

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