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I want to scale each selected edge individually along it. To do it I first duplicate each selected edge and then try to scale it using bmesh.ops.scale. Unfortunately it scales using origin/median pivot point. How to do it in python so that edges are scaled using individual origins? How can I use different pivot types from python?

Here is my script:

import bpy
import bmesh

def getDupliEdges(edges):
    dupEdges = []
    for e in edges:
        retOneEdge = bmesh.ops.duplicate(
                bm,
                geom=[e])

        dupGeom = retOneEdge["geom"]
        dupEdge = [ ele for ele in dupGeom if isinstance(ele, bmesh.types.BMEdge)]
        dupEdges.append(dupEdge[0])
    return dupEdges

def scaleEdges(dupEdges,factor):
    for e in dupEdges:
        verts = e.verts
        bmesh.ops.scale(
            bm,
            vec = factor,
            verts = verts)

obj = bpy.context.edit_object
mesh = obj.data
bm = bmesh.from_edit_mesh(mesh)
bm.faces.active = None

edges = [e for e in bm.edges if e.select == True]

view3dList = [ele for ele in bpy.context.screen.areas if isinstance(ele.spaces[0],bpy.types.SpaceView3D)]
view3d = view3dList[0]
view3d.spaces[0].pivot_point='INDIVIDUAL_ORIGINS'
    
dupEdges = getDupliEdges(edges)

scaleEdges(dupEdges, [2.0, 2.0, 2.0])

bmesh.update_edit_mesh(mesh, True)

Here is an image to illustrate the question. On the left - initial selection - 3 edges; In the middle - effect of my script; On the right - how I would like it to work. enter image description here

Thanks for any tips on that :)

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  • $\begingroup$ clone the selected edges, separate them from each other, then scale the clones using the individual origins. $\endgroup$
    – zeffii
    Feb 3, 2015 at 8:53

1 Answer 1

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You might do something like:

import bpy
import bmesh

obj = bpy.context.edit_object
bm = bmesh.from_edit_mesh(obj.data)

# current selection
edges = [e for e in bm.edges if e.select]

for e in edges:
    v1 = e.verts[0].co
    v2 = e.verts[1].co
    origin = (v1+v2) * 0.5  # edge origin
    bmv1 = bm.verts.new(((v1-origin) * 2) + origin)
    bmv2 = bm.verts.new(((v2-origin) * 2) + origin)
    bme = bm.edges.new([bmv1, bmv2])

bmesh.update_edit_mesh(obj.data, True)

I may be mistaken but I don't think at present the pivot point has any influence on bmesh.ops. So a slight modification of your original code gives a matrix to each new edge to scale: https://gist.github.com/zeffii/71862f5b1cad1bf1d2c1

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  • $\begingroup$ Cool It works:) Thanks a lot for this answer Zeffi. It answers my main question. However I am still a bit puzzled why setting up the pivot did not work in my script. If I wanted to scale these edges along 3DCursor pivot (or others) I still do not know how to do it from python. If you can explain why this line: view3d.spaces[0].pivot_point='INDIVIDUAL_ORIGINS' does not work with bmesh.ops.scale I would really appreciate it. I simply want to uderstand Blender python :) Thanks a lot! $\endgroup$
    – komi3D
    Feb 3, 2015 at 20:14
  • $\begingroup$ @komi3D since it works, could you please mark the answer as accepted (by clicking the check mark). $\endgroup$
    – stacker
    Feb 4, 2015 at 7:59
  • $\begingroup$ @komi3D your script does separate the edges and makes them individual, (tested by commenting out scaleEdges function) in theory that should work, I guess this hasn't been much help then :) $\endgroup$
    – zeffii
    Feb 4, 2015 at 9:28
  • $\begingroup$ @komi3D i'll have a look later, it should be easy $\endgroup$
    – zeffii
    Feb 4, 2015 at 9:30

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